Continuous Methods for Treating Liquids and Manufacturing Certain Constituents (e.g., Nanoparticles) in Liquids, Apparatuses and Nanoparticles and Nanoparticle/Liquid Solution(s) Resulting Therefrom
20210392899 · 2021-12-23
Assignee
Inventors
Cpc classification
C25B9/30
CHEMISTRY; METALLURGY
B22F1/056
PERFORMING OPERATIONS; TRANSPORTING
Y02P10/20
GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
B22F2999/00
PERFORMING OPERATIONS; TRANSPORTING
C22B3/22
CHEMISTRY; METALLURGY
A01N59/00
HUMAN NECESSITIES
B01J2219/0811
PERFORMING OPERATIONS; TRANSPORTING
B22F2999/00
PERFORMING OPERATIONS; TRANSPORTING
B01J19/088
PERFORMING OPERATIONS; TRANSPORTING
B22F1/056
PERFORMING OPERATIONS; TRANSPORTING
B01J2219/0894
PERFORMING OPERATIONS; TRANSPORTING
International classification
A01N59/00
HUMAN NECESSITIES
B01J19/08
PERFORMING OPERATIONS; TRANSPORTING
B22F3/00
PERFORMING OPERATIONS; TRANSPORTING
C22B3/22
CHEMISTRY; METALLURGY
C25B9/30
CHEMISTRY; METALLURGY
Abstract
This invention relates generally to novel methods and novel devices for the continuous manufacture of nanoparticles, microparticles and nanoparticle/liquid solution(s). The nanoparticles (and/or micron-sized particles) comprise a variety of possible compositions, sizes and shapes. The particles (e.g., nanoparticles) are caused to be present (e.g., created) in a liquid (e.g., water) by, for example, preferably utilizing at least one adjustable plasma (e.g., created by at least one AC and/or DC power source), which plasma communicates with at least a portion of a surface of the liquid. At least one subsequent and/or substantially simultaneous adjustable electrochemical processing technique is also preferred. Multiple adjustable plasmas and/or adjustable electrochemical processing techniques are preferred. The continuous process causes at least one liquid to flow into, through and out of at least one trough member, such liquid being processed, conditioned and/or effected in said trough member(s). Results include constituents formed in the liquid including micron-sized particles and/or nanoparticles (e.g., metallic-based nanoparticles) of novel size, shape, composition and properties present in a liquid.
Claims
1. A device comprising: at least one trough member having a longitudinal length, an inlet portion and an outlet portion; at least one plasma-forming electrode, said at least one plasma-forming electrode being located along said longitudinal length; at least one set of metallic-based electrodes also located along said longitudinal length and located closer to said outlet portion than said at least one plasma-forming electrode; at least one first power source connected to said at least one plasma-forming electrode, and at least one second power source connected to said at least one set of metallic-based electrodes.
2. The device of claim 1, further comprising at least one means for supplying liquid to said at least one trough member.
3. A device for continuously forming at least one constituent within a flowing liquid comprising: at least one trough member, comprising a longitudinal length and at least one inlet portion and at least one outlet portion; at least one plasma-forming electrode connected to at least one first power source, said at least one plasma-forming electrode being located such that when said at least one flowing liquid is present in said at least one trough member a space for a plasma is created between said at least one plasma-forming electrode and an upper surface of said at least one flowing liquid; at least one atmosphere control device covering greater than 50% of said longitudinal length; and at least one set of metallic-based electrodes connected to at least one second power source, wherein when said at least one flowing liquid is present in said at least one trough member, said at least one flowing liquid has a flow direction which causes said liquid to contact a plasma from one of said at least one plasma-forming electrodes prior to contacting one of said at least one set of metallic-based electrodes.
4. The device of claim 3, wherein said liquid comprises water.
5. The device of claim 3, wherein said at least one plasma-forming electrode comprises at least one material selected from the group consisting of platinum, titanium, zinc, silver, copper, gold, alloys and mixtures thereof.
6. The device of claim 3, wherein said at least one set of metallic-based electrodes comprises at least one material selected from the group consisting of platinum, titanium, zinc, silver, copper, gold, alloys and mixtures thereof.
7. The device of claim 6, wherein said at least one plasma-forming electrode and said at least one set of metallic-based electrodes comprise predominantly different metals.
8. The device of claim 6, wherein said at least one plasma-forming electrode and said at least one set of metallic-based electrodes comprise substantially the same metals.
9. The device of claim 3, wherein at least two plasma-forming electrodes are provided along said longitudinal length and at least two sets of metallic-based electrodes are provided along said longitudinal length.
10. The device of claim 3, wherein said at least one plasma-forming electrode is located closer to said inlet portion than said at least one set of metallic-based electrodes.
11. The device of claim 3, wherein at least two plasma-forming electrodes are located closer to said inlet portion relative to said at least two sets of metallic-based electrodes
12. The device of claim 3, wherein at least four sets of metallic-based electrodes contact said flowing liquid after said flowing liquid contacts said at least one plasma-forming electrode
13. A device for continuously modifying at least one flowing liquid comprising: at least one trough member comprising at least one inlet portion and at least one outlet portion; at least one plasma-forming electrode located closer to said inlet portion than said outlet portion, said at least one plasma-forming electrode being located such that when said at least one flowing liquid is present in said at least one trough member a space is created between said at least one plasma-forming electrode and an upper surface of said at least one flowing liquid; at least one atmosphere control device surrounding said at least one plasma-forming electrode; at least one set of metallic-based electrodes located closer to said outlet portion relative to said at least one plasma-forming electrode wherein said flowing liquid contacts a plasma from said at least one plasma-forming electrode prior to contacting said at least one set of metallic-based electrodes.
14. The device of claim 13, wherein said at least one trough member comprises at least one of a “Y-shape” and a “Ψ-shape”.
15. The device of claim 13, further comprising at least one control device for adjusting the location of at least one electrode relative to the liquid surface, wherein said at least one electrode is selected from the group consisting of said at least one plasma-forming electrode and said at least one set of metallic-based electrodes.
16. The device of claim 15, wherein said at least one control device adjusts said height by maintaining a substantially constant voltage across said at least one member.
17. The device of claim 13, wherein a first plasma-forming electrode is located upstream from a plurality of sets of metallic-based electrodes.
18. The device of claim 15 wherein said at least one liquid comprises water, said at least one plasma-forming electrode comprises at least one material selected from the group consisting of platinum, titanium, zinc, silver, copper, gold and alloys and mixtures thereof, and said at least one set of metallic-based electrodes comprises at least one material selected from the group consisting of platinum, titanium, zinc, silver, copper, gold, alloys and mixtures thereof.
19. The device of claim 1, wherein said at least one plasma-forming electrode comprises at least two plasma-forming electrodes.
20. The device of claim 1, when said at least one set of metallic-based electrodes comprises at least two sets of metallic-based electrodes.
Description
DETAILED DESCRIPTION OF THE DRAWINGS
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DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0169] The embodiments disclosed herein relate generally to novel methods and novel devices for the continuous manufacture of a variety of constituents in a liquid including nanoparticles, and nanoparticle/liquid(s) solution(s). The nanoparticles produced in the various liquids can comprise a variety of possible compositions, sizes and shapes, conglomerates, composites and/or surface morphologies which exhibit a variety of novel and interesting physical, catalytic, biocatalytic and/or biophysical properties. The liquid(s) used and/or created/modified during the process play an important role in the manufacturing of and/or the functioning of the nanoparticles and/or nanoparticle/liquid(s) solutions(s). The atmosphere(s) used play an important role in the manufacturing and/or functioning of the nanoparticle and/or nanoparticle/liquid(s) solution(s). The nanoparticles are caused to be present (e.g., created) in at least one liquid (e.g., water) by, for example, preferably utilizing at least one adjustable plasma (e.g., formed in one or more atmosphere(s)), which adjustable plasma communicates with at least a portion of a surface of the liquid. The power source(s) used to create the plasma(s) play(s) an important role in the manufacturing of and/or functioning of the nanoparticles and/or nanoparticle/liquid(s) solution(s). For example, the voltage, amperage, polarity, etc., all can influence processing and/or final properties of produced products. Metal-based electrodes of various composition(s) and/or unique configurations are preferred for use in the formation of the adjustable plasma(s), but non-metallic-based electrodes can also be utilized. Utilization of at least one subsequent and/or substantially simultaneous adjustable electrochemical processing technique is also preferred. Metal-based electrodes of various composition(s) and/or unique configurations are preferred for use in the adjustable electrochemical processing technique(s).
Adjustable Plasma Electrodes and Adjustable Electrochemical Electrodes
[0170] An important aspect of one embodiment of the invention involves the creation of an adjustable plasma, which adjustable plasma is located between at least one electrode (or plurality of electrodes) positioned above at least a portion of the surface of a liquid and at least a portion of the surface of the liquid itself. The surface of the liquid is in electrical communication with at least one second electrode (or a plurality of second electrodes). This configuration has certain characteristics similar to a dielectric barrier discharge configuration, except that the surface of the liquid is an active participant in this configuration.
[0171]
[0172] The adjustable plasma region 4, created in the embodiment shown in
[0173] The composition of the electrode 1 can also play an important role in the formation of the adjustable plasma 4. For example, a variety of known materials are suitable for use as the electrode(s) 1 of the embodiments disclosed herein. These materials include metals such as platinum, gold, silver, zinc, copper, titanium, and/or alloys or mixtures thereof, etc. However, the electrode(s) 1 (and 5) can be made of any suitable material which may comprise metal(s) (e.g., including appropriate oxides, carbides, nitrides, carbon, silicon and mixtures or composites thereof, etc.). Still further, alloys of various metals are also desirable for use with the present invention. Specifically, alloys can provide chemical constituents of different amounts, intensities and/or reactivities in the adjustable plasma 4 resulting in, for example, different properties in and/or around the plasma 4 and/or different constituents within the liquid 3. For example, different spectra can be emitted from the plasma 4, different fields can be emitted from the plasma 4, etc. Thus, the plasma 4 can be involved in the formation of a variety of different nanoparticles and/or nanoparticle/solutions and/or desirable constituents, or intermediate(s) present in the liquid 3 required to achieve desirable end products. Still further, it is not only the chemical composition and shape factor(s) of the electrode(s) 1, 5 that play a role in the formation of the adjustable plasma 4, but also the manor in which any electrode(s) 1, 5 have been manufactured can also influence the performance of the electrode(s) 1, 5. In this regard, the precise shaping technique(s) including forging, drawing and/or casting technique(s) utilized to from the electrode(s) 1, 5 can have an influence on the chemical and/or physical activity of the electrode(s) 1, 5, including thermodynamic and/or kinetic issues.
[0174] The creation of an adjustable plasma 4 in, for example, air above the surface 2 of a liquid 3 (e.g., water) will, typically, produce at least some ozone, as well as certain amounts of a variety of nitrogen-based compounds and other components. Various exemplary materials can be produced in the adjustable plasma 4 and include a variety of materials that are dependent on a number of factors including the atmosphere between the electrode 1 and the surface 2 of the liquid 3. To assist in understanding the variety of species that are possibly present in the plasma 4 and/or in the liquid 3 (when the liquid comprises water), reference is made to a 15 Jun. 2000 thesis by Wilhelmus Frederik Laurens Maria Hoeben, entitled “Pulsed corona-induced degradation of organic materials in water”, the subject matter of which is expressly herein incorporated by reference. The work in the aforementioned thesis is directed primarily to the creation of corona-induced degradation of undesirable materials present in water, wherein such corona is referred to as a pulsed DC corona. However, many of the chemical species referenced therein, can also be present in the adjustable plasma 4 of the embodiments disclosed herein, especially when the atmosphere assisting in the creation of the adjustable plasma 4 comprises humid air and the liquid 3 comprises water. In this regard, many radicals, ions and meta-stable elements can be present in the adjustable plasma 4 due to the dissociation and/or ionization of any gas phase molecules or atoms present between the electrode 1 and the surface 2. When humidity in air is present and such humid air is at least a major component of the atmosphere “feeding” the adjustable plasma 4, then oxidizing species such as hydroxyl radicals, ozone, atomic oxygen, singlet oxygen and hydropereoxyl radicals can be formed. Still further, amounts of nitrogen oxides like NO.sub.x and N.sub.2O can also be formed. Accordingly, Table 1 lists some of the reactants that could be expected to be present in the adjustable plasma 4 when the liquid 3 comprises water and the atmosphere feeding or assisting in providing raw materials to the adjustable plasma 4 comprises humid air.
TABLE-US-00001 TABLE 1 Reaction/Species Equation H.sub.2O + e.sub.− .fwdarw. OH + H + e.sub.− dissociation 2 H.sub.2O + e.sub.− .fwdarw. H.sub.2O.sub.+ + 2e.sub.− ionization 3 H.sub.2O.sub.+ + H.sub.2O .fwdarw. H.sub.3O.sub.+ + OH dissociation 4 N.sub.2 + e.sub.− .fwdarw. N.sub.2* + e.sub.− excitation 5 O.sub.2 + e.sub.− .fwdarw. O.sub.2* + e.sub.− excitation 6 N.sub.2 + e.sub.− .fwdarw. 2N + e.sub.− dissociation 7 O.sub.2 + e.sub.− .fwdarw. 2O + e.sub.− dissociation 8 N.sub.2 + e.sub.− .fwdarw. N.sub.2+ + 2e.sub.− ionization 9 O.sub.2 + e.sub.− .fwdarw. O.sub.2+ + 2e.sub.− ionization 10 O.sub.2 + e.sub.− .fwdarw. O.sub.2− attachment 11 O.sub.2 + e.sub.− .fwdarw. O.sub.− + O dissociative attachment 12 O.sub.2 + O .fwdarw. O.sub.3 association 13 H + O.sub.2 .fwdarw. HO.sub.2 association 14 H + O.sub.3 .fwdarw. HO.sub.3 association 15 N + O .fwdarw. NO association 16 NO + O .fwdarw. NO.sub.2 association 17 N.sub.2+ + O.sub.2− .fwdarw. 2NO recombination 18 N.sub.2 + O .fwdarw. N.sub.2O association 19
[0175] An April, 1995 article, entitled “Electrolysis Processes in D.C. Corona Discharges in Humid Air”, written by J. Lelievre, N. Dubreuil and J.-L. Brisset, and published in the J. Phys. III France 5 on pages 447-457 therein (the subject matter of which is herein expressly incorporated by reference) was primarily focused on DC corona discharges and noted that according to the polarity of the active electrode, anions such as nitrites and nitrates, carbonates and oxygen anions were the prominent ions at a negative discharge; while protons, oxygen and NO.sub.x cations were the major cationic species created in a positive discharge. Concentrations of nitrites and/or nitrates could vary with current intensity. The article also disclosed in Table 1 therein (i.e., Table 2 reproduced herein) a variety of species and standard electrode potentials which are capable of being present in the DC plasmas created therein. Accordingly, one would expect such species as being capable of being present in the adjustable plasma(s) 4 of the present invention depending on the specific operating conditions utilized to create the adjustable plasma(s) 4.
TABLE-US-00002 TABLE 2 O.sub.3/O.sub.2 [2.07] NO.sub.3.sup.−/N.sub.2 [1.24] HO.sub.2.sup.−/OH.sup.− [0.88] N.sub.2/NH.sub.4.sup.+ [0.27] HN.sub.3/NH.sub.4.sup.+ [1.96] O.sub.2/H.sub.2O [1.23] NO.sub.3.sup.−/N.sub.2O.sub.4 [0.81] O.sub.2/HO.sub.2.sup.− [−0.08] H.sub.2O.sub.2/H.sub.2O [1.77] NO.sub.3.sup.−/N.sub.2O [1.11] NO.sub.3.sup.−/NO.sub.2 [0.81] CO.sub.2/CO [−0.12] N.sub.2O/N.sub.2 [1.77] N.sub.2O.sub.4/HNO.sub.2 [1.07] NO/H.sub.2N.sub.2O.sub.2 [0.71] CO.sub.2/HCO.sub.2H [−0.2] NO/N.sub.2O [1.59] HNO.sub.2/NO [0.98] O.sub.2/H.sub.2O.sub.2 [0.69] N.sub.2/N.sub.2H.sub.5.sup.+ [−0.23] NO.sup.+/NO [1.46] HO.sub.3.sup.−/NO [0.96] NO.sub.3.sup.−/NO.sub.2.sup.− [0.49] CO.sub.2/H.sub.2C.sub.2O.sub.4 [−0.49] H.sub.3NOH.sup.+/ [1.42] NO.sub.3.sup.−/HNO.sub.2 [0.94] O.sub.2/OH.sup.− [0.41] N.sub.2H.sub.5.sup.+ H.sub.2O/e.sub.aq. [−2.07] N.sub.2H.sub.5/NH.sub.4.sup.+ [1.27]
[0176] An article published 15 Oct. 2003, entitled, “Optical and electrical diagnostics of a non-equilibrium air plasma”, authored by XinPei Lu, Frank Leipold and Mounir Laroussi, and published in the Journal of Physics D: Applied Physics, on pages 2662-2666 therein (the subject matter of which is herein expressly incorporated by reference) focused on the application of AC (60 Hz) high voltage (<20 kV) to a pair of parallel electrodes separated by an air gap. One of the electrodes was a metal disc, while the other electrode was a surface of water. Spectroscopic measurements performed showed that light emission from the plasma was dominated by OH (A-X, N.sub.2 (C-B) and N.sub.2.sup.+ (B-X) transitions. The spectra from
[0177] An article by Z. Machala, et al., entitled, “Emission spectroscopy of atmospheric pressure plasmas for bio-medical and environmental applications”, published in 2007 in the Journal of Molecular Spectroscopy, discloses additional emission spectra of atmospheric pressure plasmas. The spectra from
[0178] An article by M. Laroussi and X. Lu, entitled, “Room-temperature atmospheric pressure plasma plume for biomedical applications”, published in 2005 in Applied Physics Letters, discloses emission spectra fro OH, N.sub.2, N.sub.2.sup.+, He and O. The spectra from
[0179] Also known in the art is the generation of ozone by pulsed-corona discharge over a water surface as disclosed by Petr Lukes, et al, in the article, “Generation of ozone by pulsed corona discharge over water surface in hybrid gas-liquid electrical discharge reactor”, published in J. Phys. D: Appl. Phys. 38 (2005) 409-416 (the subject matter of which is herein expressly incorporated by reference). Lukes, et al, disclose the formation of ozone by pulse-positive corona discharge generated in a gas phase between a planar high voltage electrode (made from reticulated vitreous carbon) and a water surface, said water having an immersed ground stainless steel “point” mechanically-shaped electrode located within the water and being powered by a separate electrical source. Various desirable species are disclosed as being formed in the liquid, some of which species, depending on the specific operating conditions of the embodiments disclosed herein, could also be expected to be present.
[0180] Further, U.S. Pat. No. 6,749,759 issued on Jun. 15, 2004 to Denes, et al, and entitled Method for Disinfecting a Dense Fluid Medium in a Dense Medium Plasma Reactor (the subject matter of which is herein expressly incorporated by reference), discloses a method for disinfecting a dense fluid medium in a dense medium plasma reactor. Denes, et al, disclose decontamination and disinfection of potable water for a variety of purposes. Denes, et al, disclose various atmospheric pressure plasma environments, as well as gas phase discharges, pulsed high voltage discharges, etc. Denes, et al, use a first electrode comprising a first conductive material immersed within the dense fluid medium and a second electrode comprising a second conductive material, also immersed within the dense fluid medium. Denes, et al then apply an electric potential between the first and second electrodes to create a discharge zone between the electrodes to produce reactive species in the dense fluid medium.
[0181] All of the constituents discussed above, if present, can be at least partially (or substantially completely) managed, controlled, adjusted, maximized, minimized, eliminated, etc., as a function of such species being helpful or harmful to the resultant nanoparticles and/or nanoparticle/solutions produced, and then may need to be controlled by a variety of different techniques (discussed in more detail later herein). As shown in
[0182] Further, depending on, for example, electric, magnetic and/or electromagnetic field strength, polarity, etc., in and around the liquid 3, as well as the volume of liquid 3 present (e.g., a function of, for example, the cross-sectional size and shape of the trough member 30 and/or flow rate of the liquid 3) discussed in greater detail elsewhere herein), the physical and chemical construction of the electrode(s) 1 and 5, atmosphere (naturally occurring or supplied), liquid 3 composition, greater or lesser amounts of electrode(s) materials(s) (e.g., metal(s) or derivatives of metals) may be found in the liquid 3. Additional important information is disclosed in copending patent application entitled Methods for Controlling Crystal Growth, Crystallization, Structures and Phases in Materials and Systems; which was filed on Mar. 21, 2003, and was published by the World Intellectual Property Organization under publication number WO 03/089692 on Oct. 30, 2003 and the U.S. National Phase application, which was filed on Jun. 6, 2005, and was published by the United States Patent and Trademark Office under publication number 20060037177 on Feb. 23, 2006 (the inventors of each being Bentley J. Blum, Juliana H. J. Brooks and Mark G. Mortenson). The subject matter of both applications is herein expressly incorporated by reference. These published applications disclose (among other things) that the influence of, for example, electric fields, magnetic fields, electromagnetic energy, etc., have proven to be very important in the formation and/or control of various structures in a variety of solids, liquids, gases and/or plasmas. Such disclosed effects are also relevant in the embodiments disclosed herein. Further, the observation of extreme variations of, for example, pH in and around electrodes having a potential applied thereto (and current flow therethrough) also controls reaction products and/or reaction rates. Thus, a complex set of reactions are likely to be occurring at each electrode 1, 5 and electrode assemblies or electrode sets (e.g., 1, 5; 1, 1; 5, 5; etc.).
[0183] In certain situations, the material(s) (e.g., metal(s), metal ion(s), metal composite(s) or constituents (e.g., Lewis acids, Bronsted-Lowry acids, etc.) and/or inorganics found in the liquid 3 (e.g., after processing thereof) may have very desirable effects, in which case relatively large amounts of such material(s) will be desirable; whereas in other cases, certain materials found in the liquid (e.g., undesirable by-products) may have undesirable effects, and thus minimal amounts of such material(s) may be desired in the final product. Further, the structure/composition of the liquid 3 per se may also be beneficially or negatively affected by the processing conditions of the present invention. Accordingly, electrode composition can play an important role in the ultimate material(s) (e.g., nanoparticles and/or nanoparticle/solutions) that are formed according to the embodiments disclosed herein. As discussed above herein, the atmosphere involved with the reactions occurring at the electrode(s) 1 (and 5) plays an important role. However, electrode composition also plays an important role in that the electrodes 1 and 5 themselves can become part of, at least partially, intermediate and/or final products formed. Alternatively, electrodes may have a substantial role in the final products. In other words, the composition of the electrodes may be found in large part in the final products of the invention or may comprise only a small chemical part of products produced according to the embodiments disclosed herein. In this regard, when electrode(s) 1, 5 are found to be somewhat reactive according to the process conditions of the various embodiments disclosed herein, it can be expected that ions and/or physical particles (e.g., metal-based particles of single or multiple crystals) from the electrodes can become part of a final product. Such ions and/or physical components may be present as a predominant part of a particle in a final product, may exist for only a portion of the process, or may be part of a core in a core-shell arrangement present in a final product. Further, the core-shell arrangement need not include complete shells. For example, partial shells and/or surface irregularities or specific desirable surface shapes on a formed nanoparticle can have large influence on the ultimate performance of such nanoparticles in their intended use. It should be clear to an artisan of ordinary skill that slight adjustments of chemical composition, reactive atmospheres, power intensities, etc., can cause a variety of different chemical compounds (both semi-permanent and transient) nanoparticles (and nanoparticle components) to be formed, as well as different nanoparticle/solutions (e.g., including modifying the structures of the liquid 3 (such as water) per se).
[0184] Still further, the electrode(s) 1 and 5 may be of similar chemical composition or completely different chemical compositions and/or made by similar or completely different forming processes in order to achieve various compositions of ions, compounds, and/or physical particles in liquid and/or structures of liquids per se and/or specific effects from final resultant products. For example, it may be desirable that electrode pairs, shown in the various embodiments herein, be of the same or substantially similar composition, or it may be desirable for the electrode pairs, shown in the various embodiments herein, to be of different chemical composition(s). Different chemical compositions may result in, of course, different constituents being present for possible reaction in the various plasma and/or electrochemical embodiments disclosed herein. Further, a single electrode 1 or 5 (or electrode pair) can be made of at least two different metals, such that components of each of the metals, under the process conditions of the disclosed embodiments, can interact with each other, as well as with other constituents in the plasma(s) 4 and or liquid(s) 3, fields, etc., present in, for example, the plasma 4 and/or the liquid 3.
[0185] Further, the distance between the electrode(s) 1 and 5; or 1 and 1 (e.g., see
[0186] The power applied through the power source 10 may be any suitable power which creates a desirable adjustable plasma 4 and desirable adjustable electrochemical reaction under all of the process conditions of the present invention. In one preferred mode of the invention, an alternating current from a step-up transformer (discussed in the “Power Sources” section and the “Examples” section) is utilized. In other preferred embodiments of the invention, polarity of an alternating current power source is modified by diode bridges to result in a positive electrode 1 and a negative electrode 5; as well as a positive electrode 5 and a negative electrode 1. In general, the combination of electrode(s) components 1 and 5, physical size and shape of the electrode(s) 1 and 5, electrode manufacturing process, mass of electrodes 1 and/or 5, the distance “x” between the tip 9 of electrode 1 above the surface 2 of the liquid 3, the composition of the gas between the electrode tip 9 and the surface 2, the flow rate and/or flow direction “F” of the liquid 3, compositions of the liquid 3, conductivity of the liquid 3, voltage, amperage, polarity of the electrodes, etc., all contribute to the design, and thus power requirements (e.g., breakdown electric field or “Ee” of Equation 1) all influence the formation of a controlled or adjustable plasma 4 between the surface 2 of the liquid 3 and the electrode tip 9.
[0187] In further reference to the configurations shown in
[0188] For example,
[0189] The portions 6a and 6b can be covered by, for example, additional electrical insulating portions 7a and 7b. The electrical insulating portions 7a and 7b can be any suitable electrically insulating material (e.g., plastic, rubber, fibrous materials, etc.) which prevent undesirable currents, voltage, arcing, etc., that could occur when an individual interfaces with the electrode holders 6a and 6b (e.g., attempts to adjust the height of the electrodes). Moreover, rather than the electrical insulating portion 7a and 7b simply being a cover over the electrode holder 6a and 6b, such insulating portions 7a and 7b can be substantially completely made of an electrical insulating material. In this regard, a longitudinal interface may exist between the electrical insulating portions 7a/7b and the electrode holder 6a/6b respectively (e.g., the electrode holder 6a/6b may be made of a completely different material than the insulating portion 7a/7b and mechanically or chemically (e.g., adhesively) attached thereto.
[0190] Likewise, the insulating member 8 can be made of any suitable material which prevents undesirable electrical events (e.g., arcing, melting, etc.) from occurring, as well as any material which is structurally and environmentally suitable for practicing the present invention. Typical materials include structural plastics such as polycarbonate plexiglass (poly (methyl methacrylate), polystyrene, acrylics, and the like. Certain criteria for selecting structural plastics and the like include, but are not limited to, the ability to maintain shape and/or rigidity, while experiencing the electrical, temperature and environmental conditions of the process. Preferred materials include acrylics, plexiglass, and other polymer materials of known chemical, electrical and electrical resistance as well as relatively high mechanical stiffness. In this regard, desirable thicknesses for the member 8 are on the order of about 1/16″-¾″ (1.6 mm-19.1 mm).
[0191] The power source 10 can be connected in any convenient electrical manner to the electrodes 1 and 5. For example, wires 11a and 11b can be located within at least a portion of the electrode holders 6a, 6b with a primary goal being achieving electrical connections between the portions 11a, 11b and thus the electrodes 1, 5. Specific details of preferred electrical connections are discussed elsewhere herein.
[0192]
[0193]
[0194] With regard to the adjustable plasmas 4 shown in
[0195] Still further, with regard to
[0196] Likewise, a set of manually controllable electrode configurations are shown in
[0197]
[0198] Moreover, it should be understood that in alternative preferred embodiments of the invention, well defined sharp points for the tip 9 are not always required. In this regard, the electrode 1 shown in
[0199] Accordingly, it should be understood that a variety of sizes and shapes corresponding to electrode 1 can be utilized in accordance with the teachings of the present invention. Still further, it should be noted that the tips 9 of the electrodes 1 shown in various figures herein may be shown as a relatively sharp point or a relatively blunt end. Unless specific aspects of these electrode tips are discussed in greater contextual detail, the actual shape of the electrode tip(s) shown in the Figures should not be given great significance.
[0200]
[0201] Still further, it should be understood that a trough member need not be only linear or “I-shaped”, but rather, may be shaped like a “Y” or like a “Ψ”, each portion of which may have similar or dissimilar cross-sections. One reason fora “Y” or “Ψ”-shaped trough member 30 is that two different sets of processing conditions can exist in the two upper portions of the “Y”-shaped trough member 30. Further, a third set of processing conditions can exist in the bottom portion of the “Y”-shaped trough member 30. Thus, two different fluids 3, of different compositions and/or different reactants, could be brought together into the bottom portion of the “Y”-shaped trough member 30 and processed together to from a large variety of final products.
[0202]
[0203]
[0204]
[0205] It should be understood that a variety of different shapes can exist for the trough member 30, any one of which can produce desirable results.
[0206] Again with regard to
[0207]
[0208]
[0209]
[0210] Likewise,
[0211] Accordingly, it should be clear from the disclosed embodiments that the various electrode configurations or sets shown in
[0212]
[0213] Likewise,
[0214]
[0215]
[0216] As discussed herein, the electrode configurations or sets shown generally in
[0217]
[0218] Likewise, several additional alternative cross-sectional embodiments for the liquid-containing trough member 30 are shown in
[0219] Similarly, the influence of many aspects of the electrode 5 on the liquid 3 (e.g., electrochemical interactions) is also, at least partially, a function of the amount of fluid juxtaposed to the electrode(s) 5, as discussed immediately above herein.
[0220] Further, electric and magnetic field concentrations can also significantly affect the interaction of the plasma 4 with the liquid 3, as well as affect the interactions of the electrode(s) 5 with the liquid 3. For example, without wishing to be bound by any particular theory or explanation, when the liquid 3 comprises water, a variety of electric field, magnetic field and/or electromagnetic field influences can occur. Specifically, water is a known dipolar molecule which can be at least partially aligned by an electric field. Having partial alignment of water molecules with an electric field can, for example, cause previously existing hydrogen bonding and bonding angles to be oriented at an angle different than prior to electric field exposure, cause different vibrational activity, or such bonds may actually be broken. Such changing in water structure can result in the water having a different (e.g., higher) reactivity. Further, the presence of electric and magnetic fields can have opposite effects on ordering or structuring of water and/or nanoparticles present in the water. It is possible that unstructured or small structured water having relatively fewer hydrogen bonds relative to, for example, very structured water, can result in a more reactive (e.g., chemically more reactive) environment. This is in contrast to open or higher hydrogen-bonded networks which can slow reactions due to, for example, increased viscosity, reduced diffusivities and a smaller activity of water molecules. Accordingly, factors which apparently reduce hydrogen bonding and hydrogen bond strength (e.g. electric fields) and/or increase vibrational activity, can encourage reactivity and kinetics of various reactions.
[0221] Further, electromagnetic radiation can also have direct and indirect effects on water and it is possible that the electromagnetic radiation per se (e.g., that radiation emitted from the plasma 4), rather than the individual electric or magnetic fields alone can have such effects, as disclosed in the aforementioned published patent application entitled Methods for Controlling Crystal Growth, Crystallization. Structures and Phases in Materials and Systems which has been incorporated by reference herein. Different spectra associated with different plasmas 4 are discussed in the “Examples” section herein.
[0222] Further, by passing an electric current through the electrode(s) 1 and/or 5 disclosed herein, the voltages present on, for example, the electrode(s) 5 can have an orientation effect (i.e., temporary, semi-permanent or longer) on the water molecules. The presence of other constituents (i.e., charged species) in the water may enhance such orientation effects. Such orientation effects may cause, for example, hydrogen bond breakage and localized density changes (i.e., decreases). Further, electric fields are also known to lower the dielectric constant of water due to the changing (e.g., reduction of) the hydrogen bonding network. Such changing of networks should change the solubility properties of water and may assist in the concentration or dissolution of a variety of gases and/or constituents or reactive species in the liquid 3 (e.g., water) within the trough member 30. Still further, it is possible that the changing or breaking of hydrogen bonds from application of electromagnetic radiation (and/or electric and magnetic fields) can perturb gas/liquid interfaces and result in more reactive species. Still further, changes in hydrogen bonding can affect carbon dioxide hydration resulting in, among other things, pH changes. Thus, when localized pH changes occur around, for example, at least one or more of the electrode(s) 5 (or electrode(s) 1), many of the possible reactants (discussed elsewhere herein) will react differently with themselves and/or the atmosphere and/or the adjustable plasma(s) 4 as well as the electrode(s) 1 and/or 5, per se. The presence of Lewis acids and/or Bronsted-Lowry acids, can also greatly influence reactions.
[0223] Further, a trough member 30 may comprise more than one cross-sectional shapes along its entire longitudinal length. The incorporation of multiple cross-sectional shapes along the longitudinal length of a trough member 30 can result in, for example, a varying field or concentration or reaction effects being produced by the inventive embodiments disclosed herein. Additionally, various modifications can be added at points along the longitudinal length of the trough member 30 which can enhance and/or diminish various of the field effects discussed above herein. In this regard, compositions of materials in and/or around the trough (e.g., metals located outside or within at least a portion of the trough member 30) can act as concentrators or enhancers of various of the fields present in and around the electrode(s) 1 and/or 5. Additionally, applications of externally-applied fields (e.g., electric, magnetic, electromagnetic, etc.) and/or the placement of certain reactive materials within the trough member 30 (e.g., at least partially contacting a portion of the liquid 3 flowing thereby) can also result in: (1) a gathering, collecting or filtering of undesirable species; or (2) placement of desirable species onto, for example, at least a portion of an outer surface of nanoparticles already formed upstream therefrom. Further, it should be understood that a trough member 30 may not be linear or “l-shaped”, but rather may be “Y-shaped” or “Ψ-shaped”, with each portion of the “Y” or “Ψ” having a different (or similar) cross-section. One reason for a “Y” or “Ψ-shaped” trough member 30 is that two (or more) different sets of processing conditions can exist in the two (or more) upper portions of the “Y-shaped” or “Ψ-shaped” trough member 30. Further, another additional set of processing conditions can exist in the bottom portion of the “Y-shaped” trough member 30. Thus, different fluids 3, of different compositions and/or different reactants, could be brought together into the bottom portion of the “Y-shaped” trough member 30 and processed together to from a large variety of final products.
[0224]
[0225]
[0226]
[0227]
[0228]
[0229]
[0230]
[0231] It should be understood that a variety of different shapes can exist for the trough member 30, any one of which can produce desirable results.
[0232]
[0233]
[0234]
[0235]
[0236] In general, the liquid transport means 40 may include any means for moving liquids 3 including, but not limited to a gravity-fed or hydrostatic means, a pumping means, a peristaltic pumping means, a regulating or valve means, etc. However, the liquid transport means 40 should be capable of reliably and/or controllably introducing known amounts of the liquid 3 into the trough member 30. Once the liquid 3 is provided into the trough member 30, means for continually moving the liquid 3 within the trough member 30 may or may not be required. However, a simple means includes the trough member 30 being situated on a slight angle θ (e.g., less than one degree to a few degrees) relative to the support surface upon which the trough member 30 is located. For example, the difference in vertical height between an inlet portion 31 and an outlet portion 32 relative to the support surface may be all that is required, so long as the viscosity of the liquid 3 is not too high (e.g., any viscosity around the viscosity of water can be controlled by gravity flow once such fluids are contained or located within the trough member 30). In this regard,
[0237] Further, when viscosities of the liquid 3 increase such that gravity alone is insufficient, other phenomena such as specific uses of hydrostatic head pressure or hydrostatic pressure can also be utilized to achieve desirable fluid flow. Further, additional means for moving the liquid 3 along the trough member 30 could also be provided inside the trough member 30, Such means for moving the liquid 3 include mechanical means such as paddles, fans, propellers, augers, etc., acoustic means such as transducers, thermal means such as heaters (which may have additional processing benefits), etc. The additional means for moving the liquid 3 can cause liquid 3 to flow in differing amounts in different portions along the longitudinal length of the trough member 30. In this regard, for example, if liquid 3 initially flowed slowly through a first longitudinal portion of the trough member 30, the liquid 3 could be made to flow more quickly further downstream thereof by, for example, as discussed earlier herein, changing the cross-sectional shape of the trough member 30. Additionally, cross-sectional shapes of the trough member 30 could also contain therein additional fluid handling means which could speed up or slow down the rate the liquid 3 flows through the trough member 30. Accordingly, great flexibility can be achieved by the addition of such means for moving the fluid 3.
[0238]
[0239]
[0240]
[0241]
[0242]
[0243] In particular,
[0244] In contrast,
[0245]
[0246] As disclosed herein, each of the electrode configurations shown in
[0247]
[0248] Possible ion exchange membranes 50 which function as a means for separating for use with the present invention include Anionic membranes and Cationic membranes. These membranes can be homogenous, heterogeneous or microporous, symmetric or asymmetric in structure, solid or liquid, can carry a positive or negative charge or be neutral or bipolar. Membrane thickness may vary from as small as 100 micron to several mm.
[0249] Some specific ionic membranes for use with certain embodiments of the present invention include, but are not limited to: [0250] Homogeneous polymerization type membranes such as sulfonated and aminated styrene-divinylbenzene copolymers [0251] condensation and heterogeneous membranes [0252] perfluorocarbon cation exchange membranes [0253] membrane chlor-alkali technology [0254] Most of cation and anion exchange membranes used in the industrial area are composed of derivatives of styrene—divinylbenzene copolymer, chloromethylstyrene-divinylbenzene copolymer or vinylpyridines—divinylbenzene copolymer. [0255] The films used that are the basis of the membrane are generally polyethylene, polypropylene (ref. ‘U, polytetrafluoroethylene, PFA, FEP and so on. [0256] Trifluoroacrylate and styrene are used in some cases. [0257] Conventional polymers such as polyethersulfone, polyphenylene oxide, polyvinyl chloride, polyvinylidene fluoride and so on. Especially, sulfonation or chloromethylation and amination of polyethersulfone or polyphenylene oxide. [0258] Hydrocarbon ion exchange membranes are generally composed of derivatives of styrene-divinylbenzene copolymer and other inert polymers such as polyethylene, polyvinyl chloride and so on.
[0259]
[0260]
[0261]
[0262]
[0263]
[0264]
Electrode Control Devices
[0265] The electrode control devices shown generally in, for example.Math.
[0266] First, specific reference is made to
[0267] The drive motors 21a/21b can be any suitable drive motor which is capable of small rotations (e.g., slightly below 1°/360° or slightly above 1°/360°) such that small rotational changes in the drive shaft 231a are translated into small vertical changes in the electrode assemblies. A preferred drive motor includes a drive motor manufactured by RMS Technologies model 1MC17-S04 step motor, which is a DC-powered step motor. This step motors 21a/21b include an RS-232 connection 22a/22b, respectively, which permits the step motors to be driven by a remote control apparatus such as a computer or a controller.
[0268] With reference to
[0269] The electrode assembly specifically shown in
[0270] With regard to the size of the control device 20 shown in
[0271] Further, in each of the embodiments of the invention shown in
[0272]
[0273]
[0274]
[0275]
[0276]
[0277]
[0278]
[0279]
[0280]
[0281]
[0282]
[0283]
[0284] A fan assembly, not shown in the drawings, can be attached to a surrounding housing which permits cooling air to blow across the cooling fins 282. The fan assembly could comprise a fan similar to a computer cooling fan, or the like. A preferred fan assembly comprises, for example, a Dynatron DF124020BA, DC brushless, 9000 RPM, ball bearing fan measuring about 40 mm×40 mm×20 mm works well. Specifically, this fan has an air flow of approximately 10 cubic feet per minute.
[0285]
Power Sources
[0286] A variety of power sources are suitable for use with the present invention. Power sources such as AC sources, DC sources, rectified AC sources of various polarities, etc., can be used. However, in the preferred embodiments disclosed herein, an AC power source is utilized directly, or an AC power source has been rectified to create a specific DC source of variable polarity.
[0287]
[0288] When a secondary coil 603 is positioned near the primary coil 601 and core 602, this flux will link the secondary coil 603 with the primary coil 601. This linking of the secondary coil 603 induces a voltage across the secondary terminals. The magnitude of the voltage at the secondary terminals is related directly to the ratio of the secondary coil turns to the primary coil turns. More turns on the secondary coil 603 than the primary coil 601 results in a step up in voltage, while fewer turns results in a step down in voltage.
[0289] Preferred transformer(s) 60 for use in various embodiments disclosed herein have deliberately poor output voltage regulation made possible by the use of magnetic shunts in the transformer 60. These transformers 60 are known as neon sign transformers. This configuration limits current flow into the electrode(s) 1/5. With a large change in output load voltage, the transformer 60 maintains output load current within a relatively narrow range.
[0290] The transformer 60 is rated for its secondary open circuit voltage and secondary short circuit current. Open circuit voltage (OCV) appears at the output terminals of the transformer 60 only when no electrical connection is present. Likewise, short circuit current is only drawn from the output terminals if a short is placed across those terminals (in which case the output voltage equals zero). However, when a load is connected across these same terminals, the output voltage of the transformer 60 should fall somewhere between zero and the rated OCV. In fact, if the transformer 60 is loaded properly, that voltage will be about half the rated OCV.
[0291] The transformer 60 is known as a Balanced Mid-Point Referenced Design (e.g., also formerly known as balanced midpoint grounded). This is most commonly found in mid to higher voltage rated transformers and most 60 mA transformers. This is the only type transformer acceptable in a “mid-point return wired” system. The “balanced” transformer 60 has one primary coil 601 with two secondary coils 603, one on each side of the primary coil 601 (as shown generally in the schematic view in
[0292] In alternating current (AC) circuits possessing a line power factor or 1 (or 100%), the voltage and current each start at zero, rise to a crest, fall to zero, go to a negative crest and back up to zero. This completes one cycle of a typical sinewave. This happens 60 times per second in a typical US application. Thus, such a voltage or current has a characteristic “frequency” of 60 cycles per second (or 60 Hertz) power. Power factor relates to the position of the voltage waveform relative to the current waveform. When both waveforms pass through zero together and their crests are together, they are in phase and the power factor is 1, or 100%.
[0293] The normal power factor of most such transformers 60 is largely due to the effect of the magnetic shunts 604 and the secondary coil 603, which effectively add an inductor into the output of the transformer's 60 circuit to limit current to the electrodes 1/5. The power factor can be increased to a higher power factor by the use of capacitor(s) 61 placed across the primary coil 601 of the transformer, 60 which brings the input voltage and current waves more into phase.
[0294] The unloaded voltage of any transformer 60 to be used in the present invention is important, as well as the internal structure thereof. Desirable unloaded transformers for use in the present invention include those that are around 9,000 volts, 10,000 volts, 12,000 volts and 15,000 volts. However, these particular unloaded volt transformer measurements should not be viewed as limiting the scope acceptable power sources as additional embodiments. A specific desirable transformer for use with various embodiments of the invention disclosed herein is made by Franceformer, Catalog No. 9060-P-E which operates at: primarily 120 volts, 60 Hz; and secondary 9,000 volts, 60 mA.
[0295]
[0296]
[0297]
[0298]
[0299] Accordingly, each transformer assembly 60a-60h (and/or 60a′-60h′; and/or 60a″-60h′) can be the same transformer, or can be a combination of different transformers (as well as different polarities). The choice of transformer, power factor, capacitor(s) 61, polarity, electrode designs, electrode location, electrode composition, cross-sectional shape(s) of the trough member 30, local or global electrode composition, atmosphere(s), local or global liquid 3 flow rate(s), liquid 3 local components, volume of liquid 3 locally subjected to various fields in the trough member 30, neighboring (e.g., both upstream and downstream) electrode sets, local field concentrations, the use and/or position and/or composition of any membrane 50, etc., are all factors which influence processing conditions as well as composition and/or volume of constituents produced in the liquid 3, nanoparticles and nanoparticle/solutions made according to the various embodiments disclosed herein. Accordingly, a plethora of embodiments can be practiced according to the detailed disclosure presented herein.
Electrode Height Control/Automatic Control Device
[0300] A preferred embodiment of the invention utilizes the automatic control devices 20 shown in various figures herein. The step motors 21a and 21b shown in, for example,
[0301] Each set of electrodes in each embodiment of the invention has an established target voltage range. The size or magnitude of acceptable range varies by an amount between about 1% and about 10%-15% of the target voltage. Some embodiments of the invention are more sensitive to voltage changes and these embodiments should have, typically, smaller acceptable voltage ranges; whereas other embodiments of the invention are less sensitive to voltage and should have, typically, larger acceptable ranges. Accordingly, by utilizing the circuit diagram shown in
[0302] The computer or logic control for the discussed interrogation voltage adjustment techniques are achieved by any conventional program or controller, including, for example, in a preferred embodiment, standard visual basic programming steps utilized in a PC. Such programming steps include interrogating, reading, comparing, and sending an appropriate actuation symbol to increase or decrease voltage (e.g., raise or lower an electrode relative to the surface 2 of the liquid 3). Such techniques should be understood by an artisan of ordinary skill.
Examples 1-12
[0303] The following examples serve to illustrate certain embodiments of the invention but should not to be construed as limiting the scope of the disclosure.
[0304] In general, each of the 12 Examples utilize certain embodiments of the invention associated with the apparatuses generally shown in
[0305] Purified water (discussed later herein) was used as the liquid 3 in all of Examples 1-12. The depth “d” (refer to
[0306] The rate of flow of the water 3 in the trough member 30 was about 150-200 ml/minute, depending on which Example was being practiced. Specifically, for example, silver-based and copper-based nanoparticle/solution raw materials made in Examples 1-3 and 5 all utilized a flow rate of about 200 ml/minute; and a zinc-based nanoparticle/solution raw material made in Example 4 utilized a flow rate of about 150 m/minute. Such flow of water 3 was obtained by utilizing a Masterflex® L/S pump drive 40 rated at 0.1 horsepower, 10-600 rpm. The model number of the Masterflex® pump 40 was 77300-40. The pump drive had a pump head also made by Masterflex® known as Easy-Load Model No. 7518-10. In general terms, the head for the pump 40 is known as a peristaltic head. The pump 40 and head were controlled by a Masterflex® LS Digital Modular Drive. The model number for the Digital Modular Drive is 77300-80. The precise settings on the Digital Modular Drive were, for example, 150 milliliters per minute for Example 4 and 200 ml/minute for the other Examples 1-3 and 5. Tygon® Tubing having a diameter of ¼″ (i.e., size 06419-25) was placed into the peristaltic head. The tubing was made by Saint Gobain for Masterflex®. One end of the tubing was delivered to a first end 31 of the trough member 30 by a flow diffusion means located therein. The flow diffusion means tended to minimize disturbance and bubbles in water 3 introduced into the trough member 30 as well as any pulsing condition generated by the peristaltic pump 40. In this regard, a small reservoir served as the diffusion means and was provided at a point vertically above the end 31 of the trough member 30 such that when the reservoir overflowed, a relatively steady flow of water 3 into the end 31 of the V-shaped trough member 30 occurred.
[0307] Additionally, the plastic portions of the control devices 20 were also made from plexiglass having a thickness of about ⅛″ (about 3 mm). With reference to
[0308] With regard to
[0309] The size and shape of each electrode 1 utilized was about the same. The shape of each electrode 1 was that of a right triangle with measurements of about 14 mm×23 mm×27 mm. The thickness of each electrode 1 was about 1 mm. Each triangular-shaped electrode 1 also had a hole therethrough at a base portion thereof, which permitted the point formed by the 23 mm and 27 mm sides to point toward the surface 2 of the water 3. The material comprising each electrode 1 was 99.95% pure (i.e., 3N5) unless otherwise stated herein. When silver was used for each electrode 1, the weight of each electrode was about 2 grams. When zinc was used for each electrode 1, the weight of each electrode was about 1.1 grams. When copper was used for each electrode 1, the weight of each electrode was about 1.5 grams.
[0310] The wires used to attach the triangular-shaped electrode 1 to the transformer 60 were, for Examples 1-4, 99.95% (3N5) silver wire, having a diameter of about 1.016 mm. The wire used to attach the triangular shaped electrode 1 in Example 5 was 99.95% pure (3N5) copper wire, also having a diameter of about 1.016 mm. Accordingly, a small loop of wire was placed through the hole in each electrode 1 to electrically connect thereto.
[0311] The wires used for each electrode 5 comprised 99.95% pure (3N5) each having a diameter of about 1.016 mm. The composition of the electrodes 5 in Examples 1-3 was silver; in Example 4 was zinc and in Example 5 was copper. All materials for the electrodes 1/5 were obtained from ESPI having an address of 1050 Benson Way, Ashland, Oreg. 97520.
[0312] The water 3 used in Examples 1-12 as an input into the trough member 30 was produced by a Reverse Osmosis process and deionization process. In essence, Reverse Osmosis (RO) is a pressure driven membrane separation process that separates species that are dissolved and/or suspended substances from the ground water. It is called “reverse” osmosis because pressure is applied to reverse the natural flow of osmosis (which seeks to balance the concentration of materials on both sides of the membrane). The applied pressure forces the water through the membrane leaving the contaminants on one side of the membrane and the purified water on the other. The reverse osmosis membrane utilized several thin layers or sheets of film that are bonded together and rolled in a spiral configuration around a plastic tube. (This is also known as a thin film composite or TFC membrane.) In addition to the removal of dissolved species, the RO membrane also separates out suspended materials including microorganisms that may be present in the water. After RO processing a mixed bed deionization filter was used. The total dissolved solvents (“TDS”) after both treatments was about 0.2 ppm, as measured by an Accumet® AR20 pH/conductivity meter.
Example 1
Manufacturing Silver-Based Nanoparticles/Nanoparticle Solutions AT059 and AT038
[0313] This Example utilizes 99.95% pure silver electrodes 1 and 5. Table 3 summarizes portions of electrode design, location and operating voltages. As can be seen from Table 3, the target voltages were set to a low of about 550 volts and to a high of about 2,100 volts.
[0314] Further, bar charts of the actual and target voltages for each electrode in each of the 8 electrode sets, Set #1-Set #8, are shown in
TABLE-US-00003 TABLE 3 AT059 Flow Rate: 200 ml/min Room Temperature 23 C. Relative Humidity 23% Target Distance Distance Average Electrode Voltage “c-c” “x” Voltage Set # Set # (kV) in/mm in/mm (kV) 7/177.8* 1 1a 2.11 0.29/7.37 2.05 5a 1.83 N/A 1.83 8/203.2 2 1b 1.09 0.22/5.59 1.16 5b 1.14 N/A 1.14 8/203.2 3 1c 1.02 0.22/5.59 0.96 5c 0.92 N/A 0.92 8/203.2 4 1d 0.90 0.15/3.81 0.88 5d 0.78 N/A 0.77 9/228.6 5 1e 1.26 0.22/5.59 1.34 5e 0.55 N/A 0.55 8/203.2 6 1f 0.96 0.22/5.59 0.99 5f 0.72 N/A 0.72 8/203.2 7 1g 0.89 0.22/5.59 0.81 5g 0.70 N/A 0.70 8/203.2 8 1h 0.63 0.15/3.81 0.59 5h 0.86 N/A 0.85 8/203.2** Output Water 67 C. Temperature *Distance from water inlet to center of first electrode set **Distance from center of last electrode set to water outlet
Example 2
Manufacturing Silver-Based Nanoparticles/Nanoparticle Solutions AT060 and AT036
[0315] Table 4 contains information similar to that data shown in Table 3 relating to electrode set design, voltages, distances, etc. It is clear from Table 4 that the electrode configurations Set #1 and Set #2 were the same as of Set #'s 1-8 in Table 3 and Example 1. Further electrode Sets 3-8 are all configured in the same manner and corresponded to a different electrode configuration from Set #1 and Set #2 herein, which electrode configuration corresponds to that configuration shown in
TABLE-US-00004 TABLE 4 AT060 Flow Rate: 200 ml/min Room Temperature 23 C. Relative Humidity 23% Target Distance Distance Average Electrode Voltage “c-c” “x” Voltage Set # Set # (kV) in/mm in/mm (kV) 7/177.8* 1 1a 2.41 0.37/9.4 2.14 5a 1.87 N/A 1.86 8/203.2 2 1b 1.33 0.26/6.6 1.33 5b 1.13 N/A 1.13 8/203.2 3 5c 0.79 N/A 0.80 .sup. 5c′ 0.78 N/A 0.79 8/203.2 4 5d 0.85 N/A 0.86 .sup. 5d′ 0.88 N/A 0.91 9/228.6 5 5e 1.07 N/A 1.06 .sup. 5e′ 0.70 N/A 0.69 8/203.2 6 5f 0.94 N/A 0.92 .sup. 5f′ 0.92 N/A 0.90 8/203.2 7 5g 1.02 N/A 1.00 .sup. 5g′ 0.93 N/A 0.91 8/203.2 8 5h 0.62 N/A 0.63 .sup. 5h′ 0.80 N/A 0.83 8/203.2** Output Water 73 C. Temperature *Distance from water inlet to center of first electrode set **Distance from center of last electrode set to water outlet
[0316]
[0317]
[0318] The product produced according to Example 2 is referred to herein as “AT060”.
Example 3
Manufacturing Silver-Based Nanoparticles/Nanoparticle Solutions AT031
[0319] Table 5 herein sets forth electrode design and target voltages for each of the 16 electrodes in each of the eight electrode sets (i.e., Set #1-Set #8) utilized to form the product formed in this example referred to herein as “AT031”.
TABLE-US-00005 TABLE 5 AT031 Flow Rate: 200 ml/min Room Temperature 22.5 C. Relative Humidity 47% Target Distance Distance Average Electrode Voltage “c-c” “x” Voltage Set # Set # (kV) in/mm in/mm (kV) 7/177.8* 1 1a 2.24 0.22/5.59 2.28 5a 1.84 N/A 1.84 8/203.2 2 5b 1.35 N/A 1.36 .sup. 5b′ 1.55 N/A 1.55 8/203.2 3 5c 1.46 N/A 1.46 .sup. 5c′ 1.54 N/A 1.54 8/203.2 4 1d 1.62 0.19/4.83 1.61 5d 1.25 N/A 1.27 9/228.6 5 5e 1.21 N/A 1.21 .sup. 5e′ 0.82 N/A 0.82 8/203.2 6 5f 0.99 N/A 1.06 .sup. 5f′ 0.92 N/A 0.92 8/203.2 7 5g 1.02 N/A 1.03 .sup. 5g′ 0.96 N/A 0.95 8/203.2 8 5h 1.00 N/A 1.00 .sup. 5h′ 0.97 N/A 1.23 8/203.2** Output Water 83 C. Temperature *Distance from water inlet to center of first electrode set **Distance from center of last electrode set to water outlet
[0320]
[0321]
[0322] It should be noted that electrode Set #1 was the same in this Example 3 as in each of Examples 1 and 2 (i.e., an electrode configuration of 1/5). Another 1/5 configuration was utilized for each of the other electrode sets, namely Set #2 and Set #'s 5-8 were all configured in a manner according to a 5/5 configuration.
Example 4
Manufacturing Zinc-Based Nanoparticles/Nanoparticle Solutions BT006 and BT004
[0323] Material designated herein as “BT006” was manufactured in accordance with the disclosure of Example 4. Similar to Examples 1-3, Table 6 herein discloses the precise electrode combinations in each of the 8 electrode sets (i.e. Set #1-Set #8). Likewise, target and actual voltage, distances, etc., are also reported. It should be noted that the electrode set assembly of Example 4 is similar to the electrode set assembly used in Example 1, except that 99.95% pure zinc was used only for the electrodes 5. The triangular-shaped portion of the electrodes 1 also comprised the same purity zinc, however the electrical connections to the triangular-shaped electrodes were all 99.95% pure silver-wire, discussed above herein. Also, the flow rate of the reaction 3 was lower in this Example then in all the other Examples.
TABLE-US-00006 TABLE 6 BT006 Flow Rate: 150 ml/min Room Temp 73.2-74.5 F. Relative Humidity 21-22% Target Distance Distance Average Electrode Voltage “c-c” “x” Voltage Set # Set # (kV) in/mm in/mm (kV) 7/177.8* 1 1a 1.91 0.29/7.37 1.88 5a 1.64 N/A 1.64 8/203.2 2 1b 1.02 0.22/5.59 1.05 5b 1.09 N/A 1.08 8/203.2 3 1c 0.91 0.22/5.59 0.90 5c 0.81 N/A 0.82 8/203.2 4 1d 0.84 0.15/3.81 0.86 5d 0.74 N/A 0.75 9/228.6 5 1e 1.40 0.22/5.59 1.40 5e 0.54 N/A 0.55 8/203.2 6 1f 0.93 0.22/5.59 0.91 5f 0.61 N/A 0.63 8/203.2 7 1g 0.72 0.22/5.59 0.82 5g 0.75 N/A 0.75 8/203.2 8 1h 0.64 0.15/3.81 0.60 5h 0.81 N/A 0.81 8/203.2** Output Water 64 C. Temperature *Distance from water inlet to center of first electrode set **Distance from center of last electrode set to water outlet
[0324]
Example 5
Manufacturing Copper-Based Nanoparticles/Nanoparticle Solutions CT006
[0325] A copper-based nanoparticle solution designated as “CT006” was made according to the procedures disclosed in Example 5. In this regard, Table 7 sets forth pertinent operating parameters associated with each of the 16 electrodes in the 8 electrode sets.
TABLE-US-00007 TABLE 7 CT006 Flow Rate: 200 ml/min Relative Humidity 48% Room Temperature 23.1 C. Target Distance Distance Average Electrode Voltage “c-c” “x” Voltage Set # Set # (kV) (in) (in) (kV) 7/177.8* 1 1a 2.17 0.44/11.18 2.21 5a 1.75 N/A 1.74 8/203.2 2 5b 1.25 N/A 1.24 .sup. 5b′ 1.64 N/A 1.63 8/203.2 3 1c 1.45 0.22/5.59 1.43 5c 0.83 N/A 0.83 8/203.2 4 5d 0.77 N/A 0.77 .sup. 5d′ 0.86 N/A 0.86 9/228.6 5 5e 1.17 N/A 1.15 .sup. 5e′ 0.76 N/A 0.76 8/203.2 6 5f 0.85 N/A 0.84 .sup. 5f′ 0.84 N/A 0.83 8/203.2 7 5g 0.99 N/A 0.99 .sup. 5g′ 0.87 N/A 0.86 8/203.2 8 5h 0.85 N/A 0.85 .sup. 5h′ 1.10 N/A 1.09 8/203.2** Output Water 79 C. Temperature *Distance from water inlet to center of first electrode set **Distance from center of last electrode set to water outlet
[0326] Further,
[0327]
Characterization of Materials of Examples 1-5 and Mixtures Thereof
[0328] Each of the silver-based nanoparticles and nanoparticle/solutions made in Examples 1-3 (AT-059/AT-038), (AT060/AT036) and (AT031), respectively; as well as the zinc nanoparticles and nanoparticle/solutions made in Example 4 (BT-004); and the copper nanoparticles and nanoparticle-based/solutions made in Example 5 (CT4006) were physically characterized by a variety of techniques. Specifically, Tables 8 and 9 herein show each of the 5 “raw materials” made according to Examples 1-5 as well as 10 solutions or mixtures made therefrom, each of the solutions being designated “GR1-GR10” or GR1B-GR10B”. The amount by volume of each of the “raw materials” is reported for each of the 10 solutions manufactured. Further, atomic absorption spectroscopy (“AAS”) was performed on each of the raw materials of Examples 1-5 as well as on each of the 10 solutions GR1-GR10 derived therefrom. The amount of silver constituents, zinc constituents and/or copper constituents therein were thus determined. The atomic absorption spectroscopy results (AAS) are reported by metallic-based constituent.
TABLE-US-00008 TABLE 8 Solution Contents Analytical Results Silver % by Zinc % by Copper % by Ag ppm Zn ppm Cu ppm Metal ppm NO2 NO3 ID Constituent Volume Constituent Volume Constituent Volume (AAS) (AAS) (AAS) (Ionic) (ppm) (ppm) pH AT-036 AT-036 100.0% 43.8 30.8 38.9 2.3 5.31 AT-031 AT-031 100.0% 41.3 23.3 41.3 15 5.23 AT-038 AT-038 100.0% 46 24.3 N/A 11.7 3.34 BT-004 BT-004 100 0% 23.1 ** N/A 33.7 3.52 CT-006 CT-006 100.0% 9.2 17.3 5.20 4.38 GR1 AT-036 22.8% BT-004 43.3% CT-006 33.9% 9.4 10.5 3.3 * 6.2 19.7 3.93 GR2 AT-031 24.2% BT-004 43.3% CT-006 32.5% 8.7 11.4 2.9 * 7.2 21.5 3.86 GR3 AT-038 21.7% BT-004 43.3% CT-006 35.0% 9.1 10.8 3.1 * N/A 23.7 3.64 GR4 AT-036 22.8% BT-004 77.2% 9.5 19.7 5.6 N/A 36.7 3.66 GR5 AT-031 24.2% BT-004 75.8% 10.4 18.8 5.9 N/A 26.6 3.68 GR6 AT-038 21.7% BT-004 78.3% 7.6 N/A 25.3 3.5 GR7 AT-036 45.7% BT-004 54.3% 17.3 13.3 8.9 N/A 19.6 3.83 GR8 AT-036 16.0% BT-004 84.0% 7.4 20.0 5.1 N/A 29.2 3.61 GR9 AT-036 70.0% BT-004 10.0% CT-006 20.0% 27.1 2.4 1.8 * 36.2 3.1 4.54 GR10 AT-36/31/39 34.3% BT-004 65.7% 13.2 15.6 7.3 N/A 23.4 3.62 N/A ph is out of testing range * Can not be tested due to silver and copper interaction ** Zinc can not be tested with device
[0329] The AAS values were obtained from a Perkin Elmer AAnalyst 300 Spectrometer system. The samples from Examples 1-5 and Solutions GR1-GR10 were prepared by adding a small amount of nitric acid or hydrochloric acid (usually 2% of final volume) and then dilution to a desirable characteristic concentration range or linear range of the specific element to improve accuracy of the result. The “desireable” range is an order of magnitude estimate based on production parameters established during product development. For pure metals analysis, a known amount of feedstock material is digested in a known amount of acid and diluted to ensure that the signal strength of the absorbance will be within the tolerance limits and more specifically the most accurate range of the detector settings, better known as the linear range.
[0330] The specific operating procedure for the Perkin Elmer AAnalyst 300 system is as follows:
1) Principle
[0331] The Perkin Elmer AAnalyst 300 system consists of a high efficiency burner system with a Universal GemTip nebulizer and an atomic absorption spectrometer. The burner system provides the thermal energy necessary to dissociate the chemical compounds, providing free analyte atoms so that atomic absorption occurs. The spectrometer measures the amount of light absorbed at a specific wavelength using a hollow cathode lamp as the primary light source, a monochromator and a detector. A deuterium arc lamp corrects for background absorbance caused by non-atomic species in the atom cloud.
II) Instrument Setup
[0332] A) Empty waste container to mark. Add deionized water to drain tubing to ensure that water is present in the drain system float assembly. [0333] B) Ensure that the appropriate Hollow Cathode Lamp for the analyte to be analyzed is properly installed in the turret. [0334] C) Power AAnalyst 300 and computer ON. [0335] E) After the AAnalyst 300 has warmed up for approximately 3 minutes, start the AAWin Analyst software [0336] F) Recall Method to be analyzed. [0337] G) Ensure that the correct Default Conditions are entered. [0338] H) Align the Hollow Cathode Lamp. [0339] 1) Check that a proper peak and energy level has been established for the specific lamp. [0340] 2) Adjust the power and frequency of the lamp settings to obtain maximum energy. [0341] I) Store Method changes in Parameter Entry, Option, Store and #. [0342] J) Adjust Burner height. [0343] 1) Place a white sheet of paper behind the burner to confirm the location of the light beam. [0344] 2) Lower the burner head below the light beam with the vertical adjustment knob. [0345] 3) Press Cont (Continuous) to display an absorbance value. [0346] 4) Press A/Z to Autozero. [0347] 5) Raise the burner head with the vertical adjustment knob until the display indicates a slight absorbance (0.002). Slowly lower the head until the display returns to zero. Lower the head an additional quarter turn to complete the adjustment. [0348] K) Ignite flame. [0349] 1) Turn Fume Hood switch ON. [0350] 2) Open air compressor valve. Set pressure to 50 to 65 psi. [0351] 3) Open acetylene gas cylinder valve. Set output pressure to 12 to 14 psi. Replace cylinder when pressure falls to 85 psi to prevent valve and tubing damage from the presence of acetone. [0352] 4) Press Gases On/Off. Adjust oxidant flow to 4 Units. [0353] 5) Press Gases On/Off Adjust acetylene gas flow to 2 Units. [0354] 6) Press Flame On/Off to turn flame on. [0355] Note: Do not directly view the lamp or flame without protective ultraviolet radiation eyewear. [0356] L) Aspirate deionized water through the burner head several minutes. [0357] M) Adjust Burner Position and Nebulizer. [0358] 1) Aspirate a standard with a signal of approximately 0.2 absorbance units. [0359] 2) Obtain maximum burner position absorbance by rotating the horizontal and rotational adjustment knobs. [0360] 3) Loosen the nebulizer locking ring by turning it clockwise. Slowly turn the nebulizer adjustment knob to obtain maximum absorbance. Lock the knob in place with the locking ring. [0361] Note: An element, such as Magnesium, which is at a wavelength where gases do not absorb is optimal for adjusting the Burner and Nebulizer. [0362] N) Allow 30 minutes to warm-up flame and lamp.
III) Calibration Procedure
[0363] A) Calibrate with standards that bracket the sample concentrations. [0364] B) WinAA Analyst software will automatically create a calibration curve for your sample readings. But check to ensure that proper absorption is established with each calibration standard. [0365] C) Enter Standard Concentration Values in the Default Conditions to calculate an AAnalyst 300 standard curve. [0366] 1) Enter the concentration of the lowest standard for STD1 using significant digits. [0367] 2) Enter the concentrations of the other standards of the calibration curve in ascending order and the concentration of the reslope standard. [0368] 3) Autozero with the blank before each standard. [0369] 4) Aspirate Standard 1, press 0 Calibrate to clear the previous curve. Aspirate the standards in numerical order. [0370] Press standard number and calibrate for each standard. [0371] 5) Press Print to print the graph and correlation coefficient. [0372] 6) Rerun one or all standards, if necessary. To rerun Standard 3, aspirate standard and press 3 Calibrate. [0373] 7) Reslope the standard curve by pressing Reslope after aspirating the designated reslope standard. [0374] D) The correlation coefficient should be greater than or equal to 0.990. [0375] E) Check the calibration curve for drift, accuracy and precision with standards and controls every 20 samples.
IV) Analysis Procedure
[0376] A) Autozero with the blank before each standard, control and sample. [0377] B) Aspirate sample and press Read Sample. The software will take 3 readings of absorbance and then average those readings. Wait until software says idle. Rerun the sample if the standard deviation is greater than 10% of the sample result.
V) Instrument Shutdown
[0378] A) Aspirate 5% Hydrochloric Acid (HCl) for 5 minutes and deionized water for 10 minutes to clean the burner head. Remove the capillary tube from the water. [0379] B) Press Flame On/Off to turn off flame. [0380] C) Close air compressor valve. [0381] D) Close acetylene cylinder valve. [0382] E) Press Bleed Gases to bleed the acetylene gas from the lines. The cylinder pressure should drop to zero. [0383] F) Exit the software, power OFF the AAnalyst 300, and shut down the computer.
[0384] Further, the last 4 columns of Table 8 disclose “Metal PPM (Ionic)”; and 02 (ppm); NO.sub.3 (ppm); and “pH”. Each of these sets of numbers were determined by utilizing an ion selective electrode measurement technique. In particular, a NICO ion analyzer was utilized. Precise stabilization times and actual experimental procedures for collecting the data in each of these three columns of Table 8 (and Table 9) occurs immediately below.
Definitions
[0385] Stabilization Times—After immersing the electrodes in a new solution, the mV reading normally falls rapidly at first by several mV, and then gradually, and increasingly slowly, falls to a stable reading as the ISE membrane equilibrates and the reference electrode liquid junction potential stabilizes. This equilibration may take up to 3 or 4 minutes to reach a completely stable value. Sometimes the reading begins to rise again after a short period of stability and it is important to ensure that the recording is made at the lowest point, before this rise has proceeded to any great extent. In this study it was found that it was not necessary to wait for a completely stable reading but that satisfactory results could be obtained by taking a reading after a pre-set time, so that each measurement was made at the same point of the decay curve. For optimum performance it was found that this delay time should be at least two minutes to ensure that the reading was in the shallower part of the curve.
Procedure:
[0386] 1. Get two 150 mL beakers for each electrode to be used (typically 4). One beaker will be used for the solutions themselves and the other beaker will be filled with DI H.sub.2O to equalize the membranes of each electrode after each solution has been tested. [0387] 2. Obtain approximately 50 mL of the solution of interest for each electrode being used and its respective beaker. (Commonly about 200 mL for testing of Ag, NO3, NO2 and pH of a solution.) [0388] 3. If not already in place, locate and insert each desired ion selective electrode and its respective reference electrode into the appropriate receptacle. Only one electrode and its reference electrode per receptacle unless both ion selective electrodes require the use of the same reference electrode. Remove caps from each electrode and its corresponding reference electrode and place them into the electrode holder. [0389] 4. Turn on the computer associated with the NICO Ion Analyser and the software to operate it. [0390] 5. Open the 8-Channel Ion Electrode Analyser Software to operate the equipment. [0391] 6. Each ion selective electrode must be calibrated using the standards most accurate for our purposes. This calibration must be done each time the machine is turned on and for most accurate results, should be calibrated before each individual sample is tested. For each ion selective electrode, at the present time, 1 ppm, 10 ppm and 100 ppm give the best calibration for our solutions and their relative readings. Locate the “Calibrate” button on the software interface and follow the directions. [0392] 7. Each beaker is to be rinsed with DI H2O and swabbed with a lint free cloth before each use. [0393] 8. Fill each “solution” beaker with approximately 50 mL of the solution of interest and each “equalizer” beaker with approximately 100 mL of DI H2O. [0394] 9. Place each electrode into the “equalizer” beakers for approximately 15 seconds to ensure the membranes are in the same state and equal before each new solution is tested. [0395] 10. Remove electrodes from the DI H2O and wipe gently with a lint free cloth. [0396] 11. Place the electrodes into the solution so that each electrode and reference electrode is immersed at least 2 cm. Gently swirl the electrode and beaker to ensure homogeneity and good to remove any air bubbles that may be between the electrodes and the solution. [0397] 12. Let the electrodes remain undisturbed for 2-5 minutes depending on the stabilization time for the particular solution. [0398] 13. When the operator is satisfied with the reading and it occurs during the stabilization time, it must be recorded using the software. Upon hitting the “Record” button you will be prompted for a filename for this specific set of data. Also record these readings in a lab book that can be used for transferring numbers to external speadsheets and the like. [0399] 14. Remove the electrodes from the solution and discard the solution. [0400] 15. Rinse each electrode with a stream of DI H2O. [0401] 16. Rinse each 150 mL beaker with DI H2O. [0402] 17. Dry both the electrodes and the beakers with lint free cloths. [0403] 18. Return each electrode to its holder and replace caps if no further testing is to occur.
[0404] Table 9 is also included herein which contains similar data to that data shown in Table 8 (and discussed in Examples 1-5) with the only exception being AT-031. The data in Table 9 comes from procedures copied from Examples 1-5 except that such procedures were conducted at a much later point in time (months apart). The raw materials and associated solutions, summarized in Table 9 show that the raw materials, as well as solutions therefrom, are substantially constant. Accordingly, the process is very reliable and reproducible.
TABLE-US-00009 TABLE 9 Solution Contents Analytical Results Silver % by Zinc % by Copper % by Ag ppm Zn ppm Cu ppm Metal ppm NO2 NO3 ID Constituent Volume Constituent Volume Constituent Volume (AAS) (AAS) (AAS) Ionic (ppm) (ppm) pH AT-060 AT-060 100.0% 40.9 24.2 N/A 0.00 4.04 AT-031 AT-031 100.0% 41.3 23.3 41.3 15 5.23 AT-059 AT-059 100.0% 41.4 10.9 N/A 13.3 2.98 BT-006 BT-006 100.0% 24 ** N/A 20.8 3.13 CT-006 CT-006 100.0% 9.2 17.3 5.20 4.38 GR1B GR2B GR3B AT-059 24.2% BT-006 41.7% CT-006 34.2% 9.99 9.85 2.91 * N/A 58 3.27 GR4B GR5B AT-031 24.2% BT-006 75.8% 9.34 18.8 5.5 N/A 42.8 3.25 GR6B GR7B AT-060 48.9% BT-006 51.1% 20.6 12.7 8.7 N/A 30.5 3.38 GR8B AT-060 17.1% BT-006 82.9% 7.13 19.1 5 N/A 39.4 3.2 GR9B AT-060 70.0% BT-006 10.0% CT-006 20.0% 29.9 3.7 1.7 * N/A 15.8 3.82 GR10B AT-60/31/59 36.4% BT-006 63.6% 14.2 15.6 7 N/A 21.4 3.2 N/A ph is out of testing range * Can not be tested due to silver and copper interaction ** Zinc can not be tested with device
Scanning Electron Microscopy/EDS
[0405] Scanning electron microscopy was performed on each of the new materials and solutions GR1-GR10 made according to Examples 1-5.
[0406]
[0407]
[0408] XEDS spectra were obtained using a EDAX Lithium drifted silicon detector system coupled to a IXRF Systems digital processor, which was interfaced with an AMRAY 1820 SEM with a LaB6 electron gun. Interpretation of all spectra generated was performed using IXRF EDS2008, version 1.0 Rev E data collection and processing software.
[0409] Instrumentation hardware and software setup entails positioning liquid samples from each Run ID on a sample stage in such a manner within the SEM to permit the area of interest to be under the electron beam for imaging purposes while allowing emitted energies to have optimum path to the XEDS detector. A sample is typically positioned about 18 mm beneath the aperture for the final lens and tilted nominally at 18° towards the XEDS detector. All work is accomplished within a vacuum chamber, maintained at about 10.sup.6 torr.
[0410] The final lens aperture is adjusted to 200 to 300 μm in diameter and the beam spot size is adjusted to achieve an adequate x-ray photon count rate for the digital “pulse” processor. Data collection periods range between 200 and 300 seconds, with “dead-times” of less than 15%.
[0411] An aliquot of liquid sample solution is placed onto a AuPd sputtered glass slide followed by a dehydration step which includes freeze drying the solution or drying the solution under a dry nitrogen gas flow to yield particulates from the suspension. Due to the nature of the particulates, no secondary coating is required for either imaging or XEDS analysis.
[0412]
Transmission Electron Microscopy
[0413] Transmission Electron Microscopy was performed on raw materials corresponding to the components used to manufacture GR5 and GR8, as well as the solutions GR5 and GR8. Specifically, an additional run was performed corresponding to those production parameters associated with manufacturing AT031 (i.e, the silver constituent in GR5); an additional run was performed corresponding to those production parameters associated with manufacturing AT060 (i.e., the silver constituent in GR8); and an additional run was performed corresponding to those production parameters associated with manufacturing BT006 (i.e., the zinc constituent used in both GR5 and GR8). The components were then mixed together in a similar manner as discussed above herein to result in solutions equivalent to previously manufactured GR5 and GR8.
[0414]
[0415]
[0416]
[0417]
[0418]
[0419] The samples for each of the TEM photomicrographs were prepared at room temperature. Specifically, 4 microliters of each liquid sample were placed onto a holey carbon film which was located on top of filter paper (used to wick off excess liquid). The filter paper was moved to a dry spot and this procedure was repeated resulting in 8 total microliters of each liquid sample being contacted with one portion of the holey carbon film. The carbon film grids were then mounted in a single tilt holder and placed in the loadlock of the JEOL 2100 CryoTEM to pump for about 15 minutes. The sample was then introduced into the column and the TEM microscopy work performed.
[0420] The JEOL 2100 CryoTEM operated at 200 kv accelerating potential. Images were recorded on a Gatan digital camera of ultra high sensitivity. Typical conditions were 50 micron condenser aperture, spot size 2, and alpha 3.
[0421] These TEM photomicrographs show clearly that the average particle size of those particles in
[0422] TEM photomicrographs 43r do not show any significant crystallization of zinc.
[0423] TEM photomicrographs 43s (corresponding to solution GR5) also show similar silver features as shown in
[0424] Thus, these TEM photomicrographs suggest that the processing parameters utilized to manufacture GR5 resulted in somewhat smaller silver-based nanoparticles, when compared to those silver-based nanoparticles associated with GR8. The primary difference in production parameters between GR5 and GR8 was the location of the two adjustable plasmas 4 used to make the silver constituents in each solution. The zinc constituents in both of GR5 and GR8 are the same. However, the silver constituents in GR5 is made by adjustable plasmas 4 located at the First Electrode Set and the Fourth Electrode Set; whereas the silver constituent in GR8 is made by adjustable plasmas 4 located at the First and Second Electrode Sets.
UV-VIS Spectroscopy
[0425] Energy absorption spectra were obtained using US-VIS micro-spec-photometry. This information was acquired using dual beam scanning monochrometer systems capable of scanning the wavelength range of 190 nm to 1100 nm. Two UV-Vis spectrometers were used to collect absorption spectra; these were a Jasco V530 and a Jasco MSV350. Instrumentation was setup to support measurement of low-concentration liquid samples using one of a number of fuzed-quartz sample holders or “cuvettes”. The various cuvettes allow data to be collected at 10 mm, 1 mm or 0.1 mm optic path of sample. Data was acquired over the above wavelength range using both PMT and LED detectors with the following parameters; bandwidth of 2 nm, with data pitch of 0.5 nm, with and without a water baseline background. Both tungsten “halogen” and Hydrogen “D2” energy sources were used as the primary energy sources. Optical paths of these spectrometers were setup to allow the energy beam to pass through the samples with focus towards the center of the sample cuvettes. Sample preparation was limited to filling and capping the cuvettes and then physically placing the samples into the cuvette holder, within the fully enclosed sample compartment. Optical absorption of energy by the materials of interest was determined. Data output was measured and displayed as Absorbance Units (per Beer-Lambert's Law) versus wavelength and frequency.
[0426] Spectral signatures in a UV-Visible range were obtained for each of the raw materials produced in Examples 1-5 as well as in each of the solutions GR1-GR10 shown in Tables 8 and 9.
[0427] Specifically,
[0428]
[0429]
[0430]
[0431]
[0432] The UV-Vis spectral data for each of
[0433] In general, UV-Vis spectroscopy is the measurement of the wavelength and intensity of absorption of near-ultraviolet and visible light by a sample. Ultraviolet and visible light are energetic enough to promote outer electrons to higher energy levels. UV-Vis spectroscopy can be applied to molecules and inorganic ions or complexes in solution.
[0434] The UV-Vis spectra have broad features that can be used for sample identification but are also useful for quantitative measurements. The concentration of an analyte in solution can be determined by measuring the absorbance at some wavelength and applying the Beer-Lambert Law.
[0435] The dual beam UV-Vis spectrophotometer was used to subtract any signals from the solvent (in this case water) in order to specifically characterize the samples of interest. In this case the reference is the feedstock water that has been drawn from the outlet of the Reverse Osmosis process discussed in the Examples section herein.
Raman Spectroscopy
[0436] Raman spectral signatures were obtained using a Renishaw Invia Spectrometer with relevant operating information shown in
[0437] The reflection micro-spectrograph with Leica DL DM microscope was fitted with either a 20× (NA=0.5) water immersion or a 5× (NA=0.12) dry lens. The rear aperture of each lens was sized to equal or exceed the expanded laser beam diameter. Two laser frequencies were used, these being a multiline 50 mW Argon laser at W power setup for 514.5 nm and a 20 mW HeNe laser at 633 nm. High resolution gratings were fitted in the monochrometer optic path which allowed continuous scans from 50 to 4000 wavenumbers (1/cm). Ten to 20 second integration times were used. Sample fluid was placed below the lens in a 50 ml beaker. Both lasers were used to investigate resonance bands, while the former laser was primarily used to obtain Raman spectra. Sample size was about 25 ml. Measurements made with the 5× dry lens were made with the objective positioned about 5 mm above the fluid to interrogate a volume about 7 mm beneath the water meniscus. Immersion measurements were made with the 20× immersion lens positioned about 4 mm into the sample allowing investigation of the same spatial volume. CCD detector acquisition areas were individually adjusted for each lens to maximize signal intensity and signal-to-noise ratios.
Biological Characterization
Bioscreen Results
[0438] A Bioscreen C microbiology reader was utilized to compare the effectiveness of the raw materials made in accordance with Examples 1-5, as well as the 10 solutions GR1-GR10 made therefrom. Specific procedure for obtaining Bioscreen results follows below.
Bacterial Strains
[0439] Escherichia coli was obtained from the American Type Culture Collection (ATCC) under the accession number 25922. The initial pellets were reconstituted in trypticase soy broth (TSB, Becton Dickinson and Company, Sparks, Md.) and aseptically transferred to a culture flask containing 10 ml of TSB followed by overnight incubation at 37° C. in a Forma 3157 water-jacketed incubator (Thermo Scientific, Waltham, Mass., USA).
Maintenance and Storage of Bacteria
[0440] Bacterial strains were kept on trypticase soy agar (TSA, Becton Dickinson and Company, Sparks, Md.) plates and aliquots were cryogenically stored at −80° C. in MicroBank tubes (Pro-Lab Incorporated, Ontario, Canada).
Preparation of Bacterial Cultures
[0441] Microbank tubes were thawed at room temperature and opened in a NuAire Labgard 440 biological class II safety cabinet (NuAire Inc., Plymouth, Minn., USA). Using a sterile inoculating needle, one microbank bead was aseptically transferred from the stock tube into 10 ml of either Trypticase Soy Broth (TSB, Becton Dickenson and Company, Sparks, Md.) for Bioscreen analysis or Mueller-Hinton Broth (MHB, Becton Dickinson and Company, Sparks, Md.) for MIC/MLC analysis. Overnight cultures of bacterial strains were grown at 37° C. for 18 hours in a Forma 3157 water-jacketed incubator (Thermo Scientific, Waltham, Mass., USA) and diluted to a 0.5 McFarland turbidity standard. Subsequently, a 10.sup.−1 dilution of the McFarland standard was performed, to give an approximate bacterial count of 1.0×10.sup.7 CFU/ml. This final dilution must be used within 30 minutes of creation to prevent an increase in bacterial density due to cellular growth.
Dilution of Nanoparticle Solutions
[0442] Nanoparticle solutions were diluted in MHB and sterile dH.sub.2O to a 2× testing concentration yielding a total volume of 1.5 ml. Of this volume, 750 μl consisted of MHB, while the other 750 μl consisted of varying amounts of sterile dH.sub.2O and the nanoparticle solution to make a 2× concentration of the particular nanoparticle solution being tested. Testing dilutions (final concentration in reaction) ranged from 0.5 ppm Ag to 6.0 ppm Ag nanoparticle concentration with testing performed at every 0.5 ppm interval.
Preparation of Bioscreen Reaction
[0443] To determine the minimum inhibitory concentration (MIC) of nanoparticle solutions, 100 μl of the diluted bacterial culture was added to 100 μl of a particular nanoparticle solution at the desired testing concentration in the separate, sterile wells of a 100 well microtiter plate (Growth Curves USA, Piscataway, N.J., USA). Wells inoculated with both 100 μl of the diluted bacterial culture and 100 μl of a 1:1 MHB/sterile ddH.sub.2O mix served as positive controls, while wells with 100 μl of MHB and 100 μl of a 1:1 MHB/sterile ddH.sub.2O mix served as negative controls for the reaction. Plates were placed inside the tray of a Bioscreen C Microbiology Reader (Growth Curves USA, Piscataway, N.J., USA) and incubated at a constant 37° C. for 15 hours with optical density (O.D.) measurements being taken every 10 minutes. Before each O.D. measurement, plates were automatically shaken for 10 seconds at medium intensity to prevent settling of bacteria and to ensure a homogenous reaction well.
Determination of both MIC and MLC
[0444] All data was collected using EZExperiment Software (Growth Curves USA, Piscataway, N.J., USA) and analyzed using Microsoft Excel (Microsoft Corporation, Redmond, Wash., USA). The growth curves of bacteria strains treated with different nanoparticle solutions were constructed and the MIC determined. The MIC was defined as the lowest concentration of nanoparticle solution that prevented the growth of the bacterial culture for 15 hours, as measured by optical density using the Bioscreen C Microbiology Reader.
[0445] Once the MIC was determined, the test medium from the MIC and subsequent higher concentrations was removed from each well and combined according to concentration in appropriately labeled, sterile Eppendorf tubes. TSA plates were inoculated with 100 μl of test medium and incubated overnight at 37° C. in a Forma 3157 water-jacketed incubator (Thermo Scientific, Waltham, Mass., USA). The minimum lethal concentration (MLC) was defined as the lowest concentration of nanoparticle solution that prevented the growth of the bacterial culture as measured by colony growth on TSA.
[0446] The results of the Bioscreen runs are shown in
[0447] In contrast, each of the solutions GR1-GR10 showed superior performance, relative to each of the raw materials AT031, AT60 and AT059. Interestingly, the combination of the raw materials associated with silver nanoparticles with those raw materials associated with both zinc and copper nanoparticles produced unexpected synergistic results.
[0448] Additional Bioscreen results are shown in
[0449] Due to the unexpected favorable results shown in
[0450] GZA raw material was made in a manner similar to the BT-006 raw material except that a platinum electrode 1/5 configuration was utilized rather than zinc.
Freeze-Drying
[0451]
[0452] Freeze-drying was accomplished by placing the GR5 and GR8 solution in a plastic (nalgene) container and placing the plastic container in a BenchTop 2K freeze dryer (manufactured by Virtis) which was maintained at a temperature of about −52° C. and a vacuum of less than 100 milliliter. About 10-20 ml of solution will freeze-dry overnight.
[0453] As is shown in
Viability/Cytoxicity Testing of Mammalian Cells
[0454] The following procedures were utilized to obtain cell viability and/or cytotoxicity measurements.
Cell Lines
[0455] Mus musculus (mouse) liver epithelial cells (accession number CRL-1638) and Sus scrofa domesticus (minipig) kidney fibrobast cells (accession number CCL-166) were obtained from the American Type Culture Collection (ATCC).
Cell Culturing from Frozen Stocks
[0456] Cell lines were thawed by gentle agitation in a Napco 203 water bath (Thermo Scientific, Waltham, Mass., USA) at 37° C. for 2 minutes. To reduce microbial contamination, the cap and O-ring of the frozen culture vial were kept above the water level during thawing. As soon as the contents of the culture vial were thawed, the vial was removed from the water, sprayed with 95% ethanol, and transferred into a NuAire Labgard 440 biological class II safety cabinet (NuAire Inc., Plymouth, Minn., USA). The vial contents were then transferred to a sterile 75 cm.sup.2 tissue culture flask (Corning Life Sciences, Lowell, Mass., USA) and diluted with the recommended amount of complete culture medium. Murine liver epithelial cell line CRL-1638 required propagation in complete culture media composed of 90% Dulbecco's Modified Eagle's Medium (ATCC, Manassas, Va., USA) and 10% fetal bovine serum (ATCC, Manassas, Va., USA), while minipig kidney fibroblast cell line CCL-166 was grown in complete culture media comprised of 80% Dulbecco's Modified Eagle's Medium and 20% fetal bovine serum. Cell line CRL-1638 was diluted with growth media in a 1:15 ratio, while cell line CCL-166 was diluted with growth media in a 1:10 ratio. The culture flasks were then incubated at about 37° C., utilizing a 5% CO.sub.2 and 95% humidified atmosphere in a NuAire, IR Autoflow water-jacketed, CO.sub.2 incubator (NuAire Inc., Plymouth, Minn., USA).
Medium Renewal and Care of Growing Cells
[0457] Every two days, old growth medium was removed from culturing flasks and replaced with fresh growth medium. Each day, observations for microbial growth, such as fungal colonies and turbidity in medium, were made with the naked eye. Additionally, cultured cells were observed under an inverted phase contrast microscope (VWR Vistavision, VWR International, and West Chester, Pa., USA) to check for both general health of the cells and cell confluency.
Subculturing of Cells
[0458] Once cells reached approximately 80% confluent growth, cells were deemed ready for subculturing. Old growth medium was removed and discarded and the cell sheet rinsed with 5 ml of prewarmed trypsin-EDTA dissociating solution (ATCC, Manassas, Va., USA). After 30 seconds of contact with the cell sheet, the trypsin-EDTA was removed and discarded. Ensuring that both the entire cell monolayer was covered and the flask was not agitated, a 3 ml volume of the prewarmed trypsin-EDTA solution was added to the cell sheet followed by incubation of the culture flask at 37° C. for about 15 minutes. After cell dissociation, trypsin-EDTA was inactivated by adding about 6 ml of complete growth medium to the cell culture flask followed by gentle pipetting to aspirate cells.
[0459] In order to count cells, 200 μl of the cell suspension was collected in a 15 ml centrifuge tube (Corning Life Sciences, Lowell, Mass., USA). Both 300 μL of phosphate buffered saline (ATCC, Manassas, Va., USA) and 500 μL of a 0.4% trypan blue solution (ATCC, Manassas, Va., USA) was added to the collected cell suspension and mixed thoroughly. After allowing to stand for about 15 minutes, 10 μl of the mixture was placed in each chamber of an iN Cyto, C-Chip disposable hemacytometer (INCYTO, Seoul, Korea) where the cells were counted with a VWR Vistavision inverted phase contrast microscope (VWR International, West Chester, Pa., USA) according to the manufacturer's instructions. The concentration of the cells in the suspension was calculated using a conversion formula based upon the cell count obtained from the hemacytometer.
Cytotoxicity Testing
[0460] The wells of black, clear bottom, cell culture-treated microtiter plates (Corning Life Sciences, Lowell, Mass., USA) were seeded with 200 μl of culture medium containing approximately 1.7×10 cells as shown in
TABLE-US-00010 TABLE 10 Table 10. Microwell plate setup for cytotoxicity testing. All outer wells of the plate contained only 200 μl of culture medium (no cells) to act as a blank vehicle control (VCb) for the experiment. As a positive vehicle control, wells 2B-2G (VC1) and wells 11B-11G (VC2) were seeded with both culture medium and cells. One Hydronanon ™ solution was tested on each plate (H.sub.x). The highest concentration of Hydronanon ™ solution was placed in wells 3B-3D (C.sub.1), while seven, 20% dilutions (C.sub.2-C.sub.7) of each solution were present in each consecutive well. 1 2 3 4 5 6 7 8 9 10 11 12 A VCb VCb VCb VCb VCb VCb VCb VCb VCb VCb VCb VCb B VCb VC1 H.sub.1C.sub.1 H.sub.1C.sub.2 H.sub.1C.sub.3 H.sub.1C.sub.4 H.sub.1C.sub.5 H.sub.1C.sub.6 H.sub.1C.sub.7 H.sub.1C.sub.8 VC2 VCb C VCb VC1 H.sub.1C.sub.1 H.sub.1C.sub.2 H.sub.1C.sub.3 H.sub.1C.sub.4 H.sub.1C.sub.5 H.sub.1C.sub.6 H.sub.1C.sub.7 H.sub.1C.sub.8 VC2 VCb D VCb VC1 H.sub.1C.sub.1 H.sub.1C.sub.2 H.sub.1C.sub.3 H.sub.1C.sub.4 H.sub.1C.sub.5 H.sub.1C.sub.6 H.sub.1C.sub.7 H.sub.1C.sub.8 VC2 VCb E VCb VC1 C C C C C C C C VC2 VCb F VCb VC1 C C C C C C C C VC2 VCb G VCb VC1 C C C C C C C C VC2 VCb H VCb VCb VCb VCb VCb VCb VCb VCb VCb VCb VCb VCb
[0461] Microtiter plates were incubated with the treatment compounds 37° C., utilizing a 5% CO.sub.2 and 95% humidified atmosphere for 24 hours. After incubation with nanoparticle solutions, the culture medium was removed and discarded from each well and replaced with 100 μl of fresh media containing Alamar Blue® (Biosource International, Camarillo, Calif., USA) at a concentration of 50 μl dye/ml media. Plates were gently shaken by hand for about 10 seconds and incubated at about 37° C., utilizing a 5% CO.sub.2 and 95% humidified atmosphere for 2.5 hours. Fluorescence was then measured in each well utilizing an excitation wavelength of 544 nm and an emission wavelength of 590 nm. Fluorescence measurements were carried out on the Fluoroskan II fluorometer produced by Labsystems (Thermo Scientific, Waltham, Mass., USA).
Data Analysis
[0462] Cytotoxicity of the nanoparticle solutions was determined by measuring the proportion of viable cells after treatment when compared to the non-treated control cells. A percent viability of cells after treatment was then calculated and used to generate the concentration of nanoparticle at which fifty percent of cellular death occurred (LC.sub.50). All data was analyzed using GraphPad Prism software (GraphPad Software Inc., San Diego, Calif., USA).
[0463] Results of the viability/cytotoxicity tests are shown in Figures are shown in
[0464] With regard to
[0465] Similarly,
[0466] In each of
[0467]
[0468] With regard to
Example 6
Manufacturing Silver-Based Nanoparticles/Nanoparticle Solutions AT098, AT099 and AT100 without the Use of any Plasmas
[0469] This Example utilizes the same basic apparatus used to make the solutions of Examples 1-5. However, this Example does not utilize any electrode(s) 5. This Example utilizes 99.95% pure silver electrodes for each electrode 1. Tables 11a, 11b and 11c summarize portions of electrode design, configuration, location and operating voltages. As shown in Tables 11a, 11b and 11c, the target voltages were set to a low of about 2,750 volts in Electrode Set #8 and to a high of about 4.500 volts in Electrode Sets #1-3. The high of 4,500 volts essentially corresponds to an open circuit which is due to the minimal conductivity of the liquid 3 between each electrode 1, 1′ in Electrode Sets #1-3
[0470] Further, bar charts of the actual and target voltages for each electrode in each electrode set, are shown in
TABLE-US-00011 TABLE 11a Run ID: AT098 Flow Rate: 200 ml/min Target Distance Distance Average Voltage “c-c” “x” Voltage Set # Electrode # (kV) in/mm in/mm (kV) 7/177.8* 1 5a 4.54 N/A 4.54 .sub. 5a′ 4.52 N/A 4.51 65/1651** N/A N/A N/A N/A N/A N/A N/A Output Water 24 C. Temperature *Distance from water inlet to center of first electrode set **Distance from center of last electrode set to water outlet
TABLE-US-00012 TABLE 11b Run ID: AT099 Flow Rate: 200 ml/min Target Distance Distance Average Voltage “c-c” “x” Voltage Set # Electrode # (kV) in/mm in/mm (kV) 7/177.8* 1 5a 4.54 N/A 4.53 .sub. 5a′ 4.52 N/A 4.49 8/203.2 2 5b 4.55 N/A 4.56 .sub. 5b′ 4.51 N/A 4.52 57/1447.8** N/A N/A N/A N/A N/A N/A Output Water 24 C. Temperature *Distance from water inlet to center of first electrode set **Distance from center of last electrode set to water outlet
TABLE-US-00013 TABLE 11c Run ID: AT100 Flow Rate: 200 ml/min Target Distance Distance Average Voltage “c-c” “x” Voltage Set # Electrode # (kV) in/mm in/mm (kV) 7/177.8* 1 5a 4.53 N/A 4.53 .sub. 5a′ 4.49 N/A 4.49 8/203.2 2 5b 4.51 N/A 4.51 .sub. 5b′ 4.48 N/A 4.47 8/203.2 3 5c 4.52 N/A 4.52 .sub. 5c′ 4.45 N/A 4.45 8/203.2 4 5d 4.40 N/A 4.40 .sub. 5d′ 4.32 N/A 4.32 9/228.6 5 5e 4.38 N/A 4.37 .sub. 5e′ 4.27 N/A 4.26 8/203.2 6 5f 3.85 N/A 3.80 .sub. 5f′ 3.71 N/A 3.65 8/203.2 7 5g 3.55 N/A 3.43 .sub. 5g′ 3.30 N/A 3.23 8/203.2 8 5h 2.79 N/A 2.76 .sub. 5h′ 2.75 N/A 2.69 8/203.2** Output Water 82 C. Temperature *Distance from water inlet to center of first electrode set **Distance from center of last electrode set to water outlet
[0471] Atomic Absorption Spectroscopy (AAS) samples were prepared and measurement values were obtained. Slight process modifications were incorporated into those AAS procedures discussed earlier herein. These process changes are incorporated immediately below.
[0472] The AAS values were obtained from a Perkin Elmer AAnalyst 300 Spectrometer system, as in Examples 1-5. The samples manufactured in accordance with Examples 6-12 were prepared by adding a small amount of nitric acid or hydrochloric acid (usually 2-4% of final volume) and then dilution to a desirable characteristic concentration range or linear range of the specific element to improve accuracy of the result. The “desireable” range is an order of magnitude estimate based on production parameters established during product development.
[0473] For pure metals analysis, a known amount of feedstock material is digested in a known amount of acid and diluted to ensure that the signal strength of the absorbance will be within the tolerance limits and more specifically the most accurate range of the detector settings, better known as the linear range.
[0474] The specific operating procedure for the Perkin Elmer AAnalyst 300 system is as follows:
I) Principle
[0475] The Perkin Elmer AAnalyst 300 system consists of a high efficiency burner system with either a sapphire GemTip or stainless steel beaded nebulizer and an atomic absorption spectrometer. The burner system provides the thermal energy necessary to dissociate the chemical compounds, providing free analyte atoms so that atomic absorption occurs. The spectrometer measures the amount of light absorbed at a specific wavelength using a hollow cathode lamp as the primary light source, a monochromator and a detector. A deuterium arc lamp corrects for background absorbance caused by non-atomic species in the atom cloud.
II) Instrument Setup
[0476] A) Empty waste container to mark. Add deionized water to drain tubing to ensure that water is present in the drain system float assembly. [0477] B) Ensure that the appropriate Hollow Cathode Lamp for the analyte to be analyzed is properly installed in the turret. [0478] C) Power AAnalyst 300 and computer ON. [0479] D) After the AAnalyst 300 has warmed up for a minimum of 30 minutes, start the AAWin Analyst software [0480] E) Recall Method to be analyzed. [0481] F) Ensure that the correct Default Conditions are entered. [0482] G) Align the Hollow Cathode Lamp. [0483] 1) Allow HCL's to warm and stabilize for a minimum of 15 minutes. [0484] 2) Check that a proper peak and energy level has been established for the specific lamp. [0485] 3) Adjust the power and frequency of the lamp settings to obtain maximum energy. [0486] H) Store Method changes in Parameter Entry, Option, Store and #. [0487] I) Adjust Burner height. [0488] 1) Place a white sheet of paper behind the burner to confirm the location of the light beam. [0489] 2) Lower the burner head below the light beam with the vertical adjustment knob. [0490] 3) Press Cont (Continuous) to display an absorbance value. [0491] 4) Press A/Z to Autozero. [0492] 5) Raise the burner head with the vertical adjustment knob until the display indicates a slight absorbance (0.002). Slowly lower the head until the display returns to zero. Lower the head an additional quarter turn to complete the adjustment. [0493] J) Ignite flame. [0494] 1) Open air compressor valve. Set pressure to 50 to 65 psi. [0495] 2) Open acetylene gas cylinder valve. Set output pressure to 12 to 14 psi. Replace cylinder when pressure falls to 75 psi to prevent valve and tubing damage from the presence of acetone. [0496] 3) Press Gases On/Off Adjust oxidant flow to 4 Units. [0497] 4) Press Gases On/Off Adjust acetylene gas flow to 2 Units. [0498] 5) Press Flame On/Off to turn flame on. [0499] Note: Do not directly view the lamp or flame without protective ultraviolet radiation eyewear. [0500] K) Aspirate deionized water through the burner head to fully warm the burner head for 3 to 5 minutes. [0501] L) Adjust Burner Position and Nebulizer. [0502] 1) Aspirate a standard with a signal of approximately 0.2-0.5 absorbance units. [0503] 2) Obtain maximum burner position absorbance by rotating the horizontal, vertical and rotational adjustment knobs. [0504] 3) Loosen the nebulizer locking ring by turning it clockwise. Slowly turn the nebulizer adjustment knob to obtain maximum absorbance. Lock the knob in place with the locking ring. [0505] Note: An element, such as Silver, which is at a wavelength where gases do not absorb is optimal for adjusting the Burner and Nebulizer.
III) Calibration Procedure
[0506] A) Calibrate with standards that bracket the sample concentrations. [0507] B) WinAA Analyst software will automatically create a calibration curve for your sample readings. But check to ensure that proper absorption is established with each calibration standard. [0508] C) Enter Standard Concentration Values in the Default Conditions to calculate an Analyst 300 standard curve. [0509] 1) Enter the concentration of the lowest standard for STD1 using significant digits. [0510] 2) Enter the concentrations of the other standards of the calibration curve in ascending order and the concentration of the reslope standard. [0511] 3) Autozero with the blank before acquiring calibration values. [0512] 4) Aspirate Standard 1, press 0 Calibrate to clear the previous curve. Aspirate the standards in numerical order. [0513] Press standard number and calibrate for each standard. [0514] 5) Press Print to print the graph and correlation coefficient. [0515] 6) Rerun one or all standards, if necessary. To rerun Standard 3, aspirate standard and press 3 Calibrate. [0516] D) The correlation coefficient should be greater than or equal to 0.990. [0517] E) Check the calibration curve for drift, accuracy and precision with calibration standards continuously during operation, at minimum, one every 20 samples.
IV) Analysis Procedure
[0518] A) Samples are measured in triplicate using a minimum of 3 replicates per sample. [0519] B) Aspirate sample and press Read Sample. The software will take 3 readings of absorbance and then average those readings. Wait until software says idle. Rerun the sample if the standard deviation is greater than 50% of the sample result.
V) Instrument Shutdown
[0520] A) Aspirate 2% Nitric Acid (HNO.sub.3) for 1-3 minutes and deionized water for 3-5 minutes to clean the burner head. Remove the capillary tube from the water and run burner-head dry for about 1 minute. [0521] B) Press Flame On/Off to turn off flame. [0522] C) Close air compressor valve. [0523] D) Close acetylene cylinder valve. [0524] E) Press Bleed Gases to bleed the acetylene gas from the lines. The cylinder pressure should drop to zero. [0525] F) Exit the software, power OFF the AAnalyst 300, and shut down the computer.
TABLE-US-00014 TABLE 11d Run ID Electrode Configuration Measured PPM AT098 0XXXXXXX Below Detectable Limit AT099 00XXXXXX Less Than 0.2 PPM AT100 00000000 7.1 PPM
[0526] Table 11d shows the results obtained from Example 6. Table 11d contains a column entitled “Electrode Configuration”. This column contains characters “0” and “X”. The character “0” corresponds to one electrode set 5, 5′. The character “X” represents that no electrodes were present. Thus, for Run ID “AT098”, only a single electrode set 5a. 5a′ was utilized. No detectable amount of silver was measurable by the AAS techniques disclosed herein. Run ID “AT099” utilized two electrode sets 5a, 5a′ and 5b, 5b′. The AAS techniques detected some amount of silver as being present, but that amount was less than 0.2 ppm. Run ID “AT100” utilized eight electrode sets, 5, 5′. This configuration resulted in a measured ppm of 7.1 ppm. Accordingly, it is possible to obtain metallic-based constituents (e.g., metallic-based nanoparticles/nanoparticle solution) without the use of an electrode 1 (and an associated plasma 4). However, the rate of formation of metallic-based constituents is much less than that rate obtained by using one or more plasmas 4. For example, Examples 1-3 disclosed silver-based products associated with Run ID's AT031, AT036 and AT038. Each of those Run ID's utilized two electrode sets that included adjustable plasmas 4. The measured silver ppm for each of these samples was greater than 40 ppm, which is 5-6 times more than what was measured in the product made according to Run ID AT100 in this Example 6. Thus, while it is possible to manufacture metallic-based constituents without the use of at least one adjustable plasma 4 (according to the teachings herein) the rates of formation of metallic based constituents are greatly reduced when no plasmas 4 are utilized as part of the production techniques.
[0527] Accordingly, even though eight electrode sets 5, 5 were utilized to make the product associated with Run AT100, the lack of any electrode sets including at least one electrode 1 (i.e., the lack of plasma 4), severely limited the ppm content of silver in the solution produced.
Example 7
Manufacturing Silver-Based Nanoparticles/Nanoparticle Solutions AT080, AT081, AT082, AT083, AT084, AT085, AT086 and AT097 Using Only a Single Plasma
[0528] This Example utilizes the same basic apparatus used to make the solutions of Examples 1-5, however, this Example uses only a single plasma 4. Specifically, for Electrode Set #1, this Example uses a “1a, 5a” electrode configuration. Subsequent Electrode Sets #2-#8 are sequentially added. Each of Electrode Sets #2-#8 have a “5, 5” electrode configuration. This Example also utilizes 99.95% pure silver electrodes for each of electrodes 1 and 5 in each Electrode Set.
[0529] Tables 12a-12h summarize portions of electrode design, configuration, location and operating voltages. As shown in Tables 12a-12h, the target voltages were set to a low of about 900 volts (at Electrode Set #8) and a high of about 2,300 volts (at Electrode Set #1).
[0530] Further, bar charts of the actual and target voltages for each electrode in each electrode set, are shown in
TABLE-US-00015 TABLE 12a Run ID: AT097 Flow Rate: 200 ml/min Target Distance Distance Average Voltage “c-c” “x” Voltage Set # Electrode # (kV) in/mm in/mm (kV) 7/177.8* 1 1a 1.78 .26/6.8 1.79 5a 1.82 N/A 1.79 65/1651** N/A N/A N/A N/A N/A N/A N/A Output Water 35 C. Temperature *Distance from water inlet to center of first electrode set **Distance from center of last electrode set to water outlet
TABLE-US-00016 TABLE 12b Run ID: AT086 Flow Rate: 200 ml/min Target Distance Distance Average Voltage “c-c” “x” Voltage Set # Electrode # (kV) in/mm in/mm (kV) 7/177.8* 1 1a 2.18 .26/6.8 2.15 5a 1.63 N/A 1.67 8/203.2 2 5b 1.05 N/A 1.05 .sub. 5b′ 1.39 N/A 1.43 57/1447.8** N/A N/A N/A N/A N/A N/A Output Water 38 C. Temperature *Distance from water inlet to center of first electrode set **Distance from center of last electrode set to water outlet
TABLE-US-00017 TABLE 12c Run ID: AT085 Flow Rate: 200 ml/min Target Distance Distance Average Voltage “c-c” “x” Voltage Set # Electrode # (kV) in/mm in/mm (kV) 7/177.8* 1 1a 2.24 .26/6.8 2.19 5a 1.79 N/A 1.79 8/203.2 2 5b 1.16 N/A 1.16 .sub. 5b′ 1.24 N/A 1.23 8/203.2 3 5c 1.12 N/A 1.14 .sub. 5c′ 1.34 N/A 1.35 49/1244.6** N/A N/A N/A N/A N/A Output Water 43 C. Temperature *Distance from water inlet to center of first electrode set **Distance from center of last electrode set to water outlet
TABLE-US-00018 TABLE 12d Run ID: AT084 Flow Rate: 200 ml/min Target Distance Distance Average Voltage “c-c” “x” Voltage Set # Electrode # (kV) in/mm in/mm (kV) 7/177.8* 1 1a 2.29 .26/6.8 2.25 5a 1.95 N/A 1.94 8/203.2 2 5b 1.27 N/A 1.26 .sub. 5b′ 1.39 N/A 1.39 8/203.2 3 5c 1.35 N/A 1.34 .sub. 5c′ 1.26 N/A 1.25 8/203.2 4 5d 1.31 N/A 1.32 .sub. 5d′ 1.59 N/A 1.56 41/1041.4** N/A N/A N/A N/A Output Water 49 C. Temperature *Distance from water inlet to center of first electrode set **Distance from center of last electrode set to water outlet
TABLE-US-00019 TABLE 12e Run ID: AT083 Flow Rate: 200 ml/min Target Distance Distance Average Voltage “c-c” “x” Voltage Set # Electrode # (kV) in/mm in/mm (kV) 7/177.8* 1 1a 2.17 .26/6.8 2.16 5a 1.72 N/A 1.74 8/203.2 2 5b 1.10 N/A 1.12 .sub. 5b′ 1.32 N/A 1.34 8/203.2 3 5c 1.25 N/A 1.24 .sub. 5c′ 1.12 N/A 1.13 8/203.2 4 5d 1.31 N/A 1.29 .sub. 5d′ 1.32 N/A 1.33 9/228.6 5 5e 1.63 N/A 1.64 .sub. 5e′ 1.52 N/A 1.52 32/812.8** N/A N/A N/A Output Water 56 C. Temperature *Distance from water inlet to center of first electrode set **Distance from center of last electrode set to water outlet
TABLE-US-00020 TABLE 12f Run ID: AT082 Flow Rate: 200 ml/min Target Distance Distance Average Voltage “c-c” “x” Voltage Set # Electrode # (kV) in/mm in/mm (kV) 7/177.8* 1 1a 2.18 .26/6.8 2.17 5a 1.76 N/A 1.75 8/203.2 2 5b 1.08 N/A 1.09 .sub. 5b′ 1.31 N/A 1.32 8/203.2 3 5c 1.26 N/A 1.26 .sub. 5c′ 1.09 N/A 1.08 8/203.2 4 5d 1.28 N/A 1.27 .sub. 5d′ 1.25 N/A 1.22 9/228.6 5 5e 1.60 N/A 1.60 .sub. 5e′ 1.17 N/A 1.17 8/203.2 6 5f 0.99 N/A 0.98 .sub. 5f′ 1.19 N/A 1.18 24/609.6** N/A N/A Output Water 63 C. Temperature *Distance from water inlet to center of first electrode set **Distance from center of last electrode set to water outlet
TABLE-US-00021 TABLE 12g Run ID: AT081 Flow Rate: 200 ml/min Target Distance Distance Average Voltage “c-c” “x” Voltage Set # Electrode # (kV) in/mm in/mm (kV) 7/177.8* 1 1a 2.23 .26/6.8 2.18 5a 1.77 N/A 1.79 8/203.2 2 5b 1.09 N/A 1.09 .sub. 5b′ 1.30 N/A 1.28 8/203.2 3 5c 1.22 N/A 1.21 .sub. 5c′ 1.07 N/A 1.07 8/203.2 4 5d 1.27 N/A 1.27 .sub. 5d′ 1.21 N/A 1.21 9/228.6 5 5e 1.60 N/A 1.58 .sub. 5e′ 1.26 N/A 1.23 8/203.2 6 5f 1.10 N/A 1.09 .sub. 5f′ 1.02 N/A 0.99 8/203.2 7 5g 1.14 N/A 1.11 .sub. 5g′ 1.34 N/A 1.32 16/406.4** N/A Output Water 72 C. Temperature *Distance from water inlet to center of first electrode set **Distance from center of last electrode set to water outlet
TABLE-US-00022 TABLE 12h Run ID: AT080 Flow Rate: 200 ml/min Target Distance Distance Average Voltage “c-c” “x” Voltage Set # Electrode # (kV) in/mm in/mm (kV) 7/177.8* 1 1a 2.11 .26/6.8 2.13 5a 1.72 N/A 1.73 8/203.2 2 5b 1.00 N/A 1.00 .sub. 5b′ 1.23 N/A 1.24 8/203.2 3 5c 1.16 N/A 1.16 .sub. 5c′ 0.97 N/A 0.98 8/203.2 4 5d 1.15 N/A 1.17 .sub. 5d′ 1.14 N/A 1.14 9/228.6 5 5e 1.47 N/A 1.49 .sub. 5e′ 1.16 N/A 1.16 8/203.2 6 5f 1.02 N/A 1.02 .sub. 5f′ 0.98 N/A 0.98 8/203.2 7 5g 1.06 N/A 1.07 .sub. 5g′ 0.94 N/A 0.96 8/203.2 8 5h 0.92 N/A 0.93 .sub. 5h′ 1.12 N/A 1.14 8/203.2** Output Water 82 C. Temperature *Distance from water inlet to center of first electrode set **Distance from center of last electrode set to water outlet
[0531] Atomic Absorption Spectroscopy (AAS) samples were prepared and measurement values were obtained, as discussed in Example 6. Table 12i shows the results. Note that Table 12i includes a column entitled “Electrode Configuration”. This column contains characters of “1” and “0” and “V”. The “1's” represent an electrode configuration corresponding to Electrode Set #1 (i.e., a 1, 5 combination). The “0's” represent an electrode combination of 5, 5′. The character “X” represents that no electrodes were present. Thus, for example, “AT084” is represented by “1000XXXX” which means a four electrode set combination was used to make “AT084” and the combination corresponded to Set #1=1, 5; Set #2=5, 5; Set #3=5, 5 and Set #4=5, 5 (there were no Sets after Set #4, as represented by “XXXX”).
TABLE-US-00023 TABLE 12i Average Measured Measured Particle Size Electrode Ag PPM Ag PPM Diameter Range Run ID Configuration (initial) (10 days) (Initial) AT097 1XXXXXXX 6.5 6.5 2 nm AT086 10XXXXXX 14.9 13.4 3-7 nm AT085 100XXXXX 19.2 18.4 3-8 nm AT084 1000XXXX 24.1 22.9 4-8 nm AT083 10000XXX 30.4 28.1 6-15 nm AT082 100000XX 34.2 27.4 20-100 nm AT081 1000000X 36.7 29.3 40-120 nm AT080 10000000 40.9 31.6 40-150 nm
[0532] Table 12i includes a column entitled “Measured Ag PPM (initial)”. This column corresponds to the silver content of each of the eight solutions measured within one hour of its production. As shown, the measured ppm increases with each added Electrode Set, wherein the Run AT080 produces a ppm level for silver comparable in amount to Run ID AT031 of Example 3. However, another column entitled, “Measured Ag PPM (10 days)” shows data which tells another story. Specifically, the “initial” and “10 day” PPM measurements are essentially the same (e.g., within operation error of the AAS) for samples corresponding to Run Id's AT097, AT086, AT085, AT084 and AT083. This means that essentially no significant settling of the constituent particles found in five of the eight runs occurred. However, once samples associated with Run ID AT082, AT081 and AT080 were examined after 10 days, a significant portion of the constituent particles had settled, with samples taken from Run AT080 losing about 0 ppm out of 40 ppm due to particulate settling.
[0533] In order to obtain an idea of what particle sizes were being produced in each of the eight samples associated with this Example 7, a dynamic light scattering (DLS) approach was utilized. Specifically, dynamic light scattering methods utilizing variations of scattered light intensities from an LED laser were measured over time to determine any changes in intensity from particle motion due to Brownian Motion. The instrument used to perform these measurements was a VISCOTEK 802 DLS with Dual Alternating Technology (D.A.T.).
[0534] All measurements were made using a 12 μL quartz cell, which was placed into a temperature controlled cell block. One 827.4 nm laser beam was passed through the solution to be measured. Scattering intensities were measured using a CCD detector with an optical view path mounted transversely to that of the laser. Experimental data was then mathematically transformed using variation of Einstein-Stokes and Rayleigh equations to derive values representative of particle size and distribution information. Data collection and math transforms were performed using Viscotek Omnisize version 3,0,0,291 software. This instrument hardware and software reliably provides measurements for particles with a radius from 0.8 nm to 2 μm.
[0535] This technique works best when the solution is free of micro-bubbles and particles subject to Stokes settling motion (some of which was clearly occurring in at least three of the samples in this Example 7). All vessels used to contain and prepare materials to be tested were rinsed and blow-dried to remove any debris. All water used to prepare vessels and samples was doubly deionized and 0.2 μm filtered. If solvent is needed, use only spectrographic grade isopropyl alcohol. All were rinsed with clean water after solvent exposure, and wiped only with clean lint-free cotton cloth.
[0536] An aliquot of solution sample, about 3 ml in total volume, was drawn into a small syringe and then dispensed into a clean about 4 dram glass sample vial. Two (2) syringe filters (0.45 μm) were fixed onto the syringe during this operation to doubly filter the sample, thus removing any large particles not intended as part of the solution. This sample was placed into a small vacuum chamber, where it was subjected to a 1 minute exposure to a low-level vacuum (<29.5 inches Hg) to boil the suspension, removing suspended micro-bubbles. The vacuum was drawn through a small dual-stage rotary vacuum pump such as a Varian SD-40. Using a glass Tuberculin syringe with a 20 gage or smaller blunted needle, sample was withdrawn to fill the syringe and then rinsed, then placed into the 12 μL sample cell/cuvette. Additional like-type syringes were used to withdraw used sample and rinse fluids from this cell. The filled cuvette was inspected for obvious entrapped bubbles within the optical path.
[0537] This cell was inserted into the holder located in the VISCOTEK 802 DLS. Prior to this step, the instrument was allowed to fully warm to operating temperature for about 30 minutes and operating “OmniSIZE” software loaded in the controlling computer. This software will communicate and set-up the instrument to manufacturer prescribed conditions. Select a “new” measurement. Validate that the correct sample measurement parameters are selected, i.e.; temperature of 40° C., “Target” laser attenuation value of 300 k counts per second, 3 second measurement duration, water as the solvent, spike and drift respectively at 20% and 15%. Correct if needed. Then select “Tools-Options” from the controlling menu bar. Insure proper options are annotated; i.e. resolution at 200, ignore first 2 data points, peak reporting threshold of 0 and 256 correlator channels.
[0538] Once the sample was placed into the holder, the cover lid was securely closed causing the laser shutter to open. The sample was allowed to temperature stabilize for 5 to 10 minutes. On the menu tools bar, “Auto-Attenuate” was selected to cause the adjustment of laser power to fit the measurement requirements. Once the instrument and sample was set-up, the scatter intensity graphic display was observed. Patterns should appear uniform with minimal random spikes due to entrained nano/micro-bubbles or settling large particles.
[0539] A measurement was then performed. The developing correlation curve was also observed. This curve should display a shape as an “inverted S” and not “spike” out-of-limits. If the set-up was correct, parameters were adjusted to collect 100 measurements and “run” was then selected. The instrument auto-collected data and discarded correlation curves, not exhibiting Brownian motion behavior. At measurement series completion, retained correlation curves were inspected. All should exhibit expected shape and displayed between 30% and 90% expected motion behaviors. At this point, collected data was saved and software calculated particle size information. The measurement was repeated to demonstrate reproducibility. Resultant graphic displays were then inspected. Residuals should appear randomly dispersed and data measurement point must follow calculated theoretical correlation curve. The graphic distribution display was limited to 0.8 nm to 2 μm. The Intensity Distribution and Mass Distribution histograms were reviewed to find particle sizes and relative proportions of each, present in the suspension. All information was then recorded and documented.
[0540]
[0541] In an effort to understand further the particles produced as a function of the different electrode combinations set forth in the Example 7, SEM photomicrographs of similar magnification were taken of each dried solution corresponding to each of the eight solutions made in this Example. These SEM photomicrographs are shown in
[0542] It should be noted that samples were prepared for the SEM by allowing a small amount of each solution produced to air dry on a glass slide. Accordingly, it is possible that some crystal growth may have occurred during drying. However, the amount of “growth” shown in each of samples AT082-AT080 is more than could possibly have occurred during drying alone. It is clear from the SEM photomicrographs that cubic-shaped crystals are evident in AT082, AT081 and AT080. In fact, nearly perfect cubic-shaped crystals are shown in
[0543] Accordingly, without wishing to be bound by any particular theory or explanation, when comparing the results of Example 7 with Example 6, it becomes clear that the creation of the plasma 4 has a profound impact on this inventive process. Moreover, once the plasma 4 is established, conditions favor the production of metallic-based constituents, including silver-based nanoparticles, including the apparent growth of particles as a function of each new electrode set 5, 5′ provided sequentially along the trough member 30. However, if the goal of the process is to maintain the suspension of metallic-based nanoparticles in solution, then, under the process conditions of this Example 7, some of the particles produced begin to settle out near the last three Electrode Sets (i.e., Run Id's AT082, AT081 and AT080). However, if the goal of the process is to achieve particulate matter settling, then that goal can be achieved by following the configurations in Runs AT082, AT081 and AT080.
[0544] UV-Vis spectra were obtained for each of the settled mixtures AT097-AT080. Specifically, UV-Vis spectra were obtained as discussed above herein (see the discussion in the section entitled, “Characterization of Materials of Examples 1-5 and Mixtures Thereof”).
[0545] UV-Vis spectra for these same eight samples are also shown in
[0546] In an effort to determine efficacy against an E. coli bacteria (discussed in greater detail earlier herein), each of the eight solutions made according to this Example 7 were all diluted to the exact same ppm for silver in order to compare their relative efficacies in a normalized approach. In this regard, the normalization procedure was, for each of the samples, based on the ppm measurements taken after ten days of settling. Accordingly, for example, samples made according to Run AT080 were diluted from 31.6 ppm down to 4 ppm; whereas the samples associated with Run AT083 were diluted from 28.1 ppm, down to 4 ppm. These samples were then further diluted to permit Bioscreen measurements to be performed, as discussed above herein.
[0547]
Example 8
Manufacturing Silver-Based Nanoparticles/Nanoparticle Solutions AT089, AT090 and AT091 Using One or Two Plasmas
[0548] This Example utilizes the same basic apparatus used to make the solutions of Examples 1-5, however, this Example uses only a single plasma 4 to make AT090 (i.e., similar to AT080); two plasmas 4 to make AT091 (i.e., similar to AT031); and two plasmas 4 to make AT089 (first time run), wherein Electrode Set #1 and Electrode Set #8 both utilize plasmas 4. This Example also utilizes 99.95% pure silver electrodes for each of electrodes 1 and 5 in each Electrode Set.
[0549] Tables 13a, 13b and 13c summarize portions of electrode design, configuration, location and operating voltages. As shown in Tables 13a-13c, the target voltages were on average highest associated with AT089 and lowest associated with AT091.
[0550] Further, bar charts of the actual and target voltages for each electrode in each electrode set, are shown in
TABLE-US-00024 TABLE 13a Run ID: AT090 Flow Rate: 200 ml/min Target Distance Distance Average Voltage “c-c” “x” Voltage Set # Electrode # (kV) in/mm in/mm (kV) 7/177.8* 1 1a 2.03 0.22/5.59 2.09 5a 1.62 N/A 1.69 8/203.2 2 5b 0.87 N/A 0.94 .sub. 5b′ 1.08 N/A 1.11 8/203.2 3 5c 1.04 N/A 1.10 .sub. 5c′ 0.94 N/A 0.97 8/203.2 4 5d 1.23 N/A 1.26 .sub. 5d′ 1.24 N/A 1.30 9/228.6 5 5e 1.42 N/A 1.47 .sub. 5e′ 1.11 N/A 1.12 8/203.2 6 5f 1.03 N/A 1.01 .sub. 5f′ 1.01 N/A 1.03 8/203.2 7 5g 1.15 N/A 1.13 .sub. 5g′ 0.94 N/A 1.02 8/203.2 8 5h 0.81 N/A 1.04 .sub. 5h′ 1.03 N/A 1.04 8/203.2** Output Water 85 C. Temperature *Distance from water inlet to center of first electrode set **Distance from center of last electrode set to water outlet
TABLE-US-00025 TABLE 13b Run ID: AT091 Flow Rate: 200 ml/min Target Distance Distance Average Voltage “c-c” “x” Voltage Set # Electrode # (kV) in/mm in/mm (kV) 7/177.8* 1 1a 2.04 0.22/5.59 2.04 5a 1.67 N/A 1.66 8/203.2 2 5b 0.94 N/A 0.93 .sub. 5b′ 1.11 N/A 1.10 8/203.2 3 5c 1.01 N/A 0.98 .sub. 5c′ 1.07 N/A 1.05 8/203.2 4 1d 1.44 0.19/4.83 1.41 5d 1.12 N/A 1.11 9/228.6 5 5e 1.09 N/A 1.07 .sub. 5e′ 0.56 N/A 0.55 8/203.2 6 5f 0.72 N/A 0.71 .sub. 5f′ 0.72 N/A 0.70 8/203.2 7 5g 0.79 N/A 0.81 .sub. 5g′ 0.73 N/A 0.68 8/203.2 8 5h 0.64 N/A 0.68 .sub. 5h′ 0.92 N/A 0.89 8/203.2** Output Water 73 C. Temperature *Distance from water inlet to center of first electrode set **Distance from center of last electrode set to water outlet
TABLE-US-00026 TABLE 13c Run ID: AT089 Flow Rate: 200 ml/min Target Distance Distance Average Voltage “c-c” “x” Voltage Set # Electrode # (kV) in/mm in/mm (kV) 7/177.8* 1 1a 2.18 0.22/5.59 2.16 5a 1.80 N/A 1.77 8/203.2 2 5b 0.99 N/A 0.99 .sub. 5b′ 1.15 N/A 1.13 8/203.2 3 5c 1.12 N/A 1.14 .sub. 5c′ 1.00 N/A 0.98 8/203.2 4 5d 1.33 N/A 1.27 .sub. 5d′ 1.35 N/A 1.32 9/228.6 5 5e 1.51 N/A 1.49 .sub. 5e′ 1.16 N/A 1.12 8/203.2 6 5f 1.05 N/A 1.00 .sub. 5f′ 1.04 N/A 1.01 8/203.2 7 5g 1.15 N/A 1.11 .sub. 5g′ 1.14 N/A 1.10 8/203.2 8 1h 1.23 0.19/4.83 1.19 5h 1.31 N/A 1.27 8/203.2** Output Water 78 C. Temperature *Distance from water inlet to center of first electrode set **Distance from center of last electrode set to water outlet
[0551] Atomic Absorption Spectroscopy (AAS) samples were prepared and measurement values were obtained, as discussed in Example 6. Table 13d shows the results. Note that Table 13d includes a column entitled “Electrode Configuration”. This column contains characters of “1” and “0”. The “l's” represent an electrode configuration corresponding to Electrode Set #1 (i.e., a 1, 5 combination). The “0's” represent an electrode combination of 5, 5′. Thus, for example, “AT089” is represented by “10000001” which means an eight electrode set combination was used to make “AT089” and the combination corresponded to Set #1=1, 5; Sets #2-#7=5, 5; and Set #8=1, 5.
TABLE-US-00027 TABLE 13d Electrode Measured Ag Measured Ag Run ID Configuration PPM (initial) PPM (20 hours) AT089 10000001 44.3 45.0 AT090 10000000 40.8 37.2 AT091 10010000 43.6 44.3
[0552] Table 13d includes a column entitled “Measured Ag PPM (initial)”. This column corresponds to the silver content of each of the eight solutions measured within one hour of its production. As shown, the measured ppm for each of the three Runs were generally similar. However, another column entitled, “Measured Ag PPM (20 hours)” shows that the “initial” and “20 hours” PPM measurements are essentially the same (e.g., within operation error of the AAS) for samples corresponding to Run Id's AT089 and AT091. This means that essentially no significant settling of the constituent particles found in these runs occurred. However, the sample associated with Run ID AT090 was examined after 20 hours, a significant portion of the constituent particles had settled, with the samples taken from Run AT089 losing about 3.6 ppm out of 40 ppm due to particulate settling.
[0553] As discussed in Example 7, a dynamic light scattering (DLS) approach was utilized to obtain average particle size made in each of these three samples. The largest particles were made in AT090; and the smallest particles were made in AT091. Specifically.
[0554] In an effort to determine efficacy against an E. coli bacteria (discussed in greater detail earlier herein), each of the three solutions made according to this Example 8 were all diluted to the exact same ppm for silver in order to compare their relative efficacies in a normalized manner. In this regard, the normalization procedure was, for each of the samples, based on the ppm measurement taken after twenty hours of settling. Accordingly, for example, samples made according to Run AT090 were diluted from 37.2 ppm down to 4 ppm; whereas the samples associated with Run AT091 were diluted from 44.0 ppm, down to 4 ppm. These samples were then further diluted to permit Bioscreen measurements to be performed, as discussed above herein.
Example 9
[0555] Manufacturing Silver-Based Nanoparticles/Nanoparticle Solutions AT091, AT092, AT093, AT094 and AT095 Using Plasmas in Multiple Atmospheres
[0556] This Example utilizes essentially the same basic apparatus used to make the solutions of Examples 1-5, however, this Example uses two plasmas 4 occurring in a controlled atmosphere environment. Controlled atmospheres were obtained by using the embodiment shown in
[0557] Tables 14a-14e summarize portions of electrode design, configuration, location and operating voltages. As shown in Tables 14a-14e, the target voltages were set to a low of about 400-500 volts (reducing atmosphere and ozone) and a high of about 3,000 volts (helium atmosphere).
[0558] Further, bar charts of the actual and target voltages for each electrode in each electrode set, are shown in
[0559] Likewise, the atmosphere of ozone (AT094) was achieved by creating a positive pressure of ozone created by an ozone generator and inputted into the atmosphere control device 35, as discussed above herein. It should be noted that significant nitrogen content was probably present in the supplied ozone.
[0560] Further, the atmosphere of helium (AT095) was achieved by creating a positive pressure of helium inputted into the atmosphere control device 35, as discussed above herein.
[0561] The atmosphere of air was achieved without using the atmosphere control device 35.
[0562] The reducing atmosphere (or air-deprived atmosphere) was achieved by providing the atmosphere control device 35 around each electrode 1, 5 in Electrode Sets #1 and #4 and not providing any gas into the inlet portion 37 of the atmosphere control devices 35. In this instance, the external atmosphere (i.e., an air atmosphere) was found to enter into the atmosphere control device 35 through the hole 37 and the plasma 4 created was notably much more orange in color relative to the air atmosphere plasma.
[0563] In an effort to understand the composition of each of the plasmas 4, a “Photon Control Silicon CCD Spectrometer, SPM-002-E” (from Blue Hill Optical Technologies, Westwood, Mass.) was used to collect the spectra for each of the plasmas 4.
[0564] Specifically, in reference to
[0565] Prior to the collection of any spectra created by each plasma 4, the atmosphere control device 35 was saturated with each gas for 30 seconds and a background spectrum was collected with 2 second exposure set in the software package. The plasma 4 was active for 10 minutes prior to any data collection. The primary spot from the laser 501 was aligned with the same point each time. Three separate spectra were collected for each run and then averaged. The results of each spectra are shown in
TABLE-US-00028 TABLE 14a Run ID: AT091 Flow Rate: 200 ml/min Atmosphere For Set #1 and Set #4: Air Target Distance Distance Average Voltage “c-c” “x” Voltage Set # Electrode # (kV) in/mm in/mm (kV) 7/177.8* 1 1a 2.04 0.22/5.59 2.04 5a 1.67 N/A 1.66 8/203.2 2 5b 0.94 N/A 0.93 .sub. 5b′ 1.11 N/A 1.10 8/203.2 3 5c 1.01 N/A 0.98 .sub. 5c′ 1.07 N/A 1.05 8/203.2 4 1d 1.44 0.19/4.83 1.41 5d 1.12 N/A 1.11 9/228.6 5 5e 1.09 N/A 1.07 .sub. 5e′ 0.56 N/A 0.55 8/203.2 6 5f 0.72 N/A 0.71 .sub. 5f′ 0.72 N/A 0.70 8/203.2 7 5g 0.79 N/A 0.81 .sub. 5g′ 0.73 N/A 0.68 8/203.2 8 5h 0.64 N/A 0.68 .sub. 5h′ 0.92 N/A 0.89 8/203.2** Output Water 73 C. Temperature *Distance from water inlet to center of first electrode set **Distance from center of last electrode set to water outlet
TABLE-US-00029 TABLE 14b Run ID: AT092 Flow Rate: 200 ml/min Atmosphere For Set #1 and Set #4: Nitrogen Target Distance Distance Average Voltage “c-c” “x” Voltage Set # Electrode # (kV) in/mm in/mm (kV) 7/177.8* 1 1a 2.39 0.22/5.59 2.27 5a 2.02 N/A 1.99 8/203.2 2 5b 1.39 N/A 1.30 .sub. 5b′ 1.51 N/A 1.54 8/203.2 3 5c 1.49 N/A 1.47 .sub. 5c′ 1.50 N/A 1.52 8/203.2 4 1d 1.64 0.19/4.83 1.66 5d 1.33 N/A 1.31 9/228.6 5 5e 1.46 N/A 1.47 .sub. 5e′ 1.05 N/A 0.98 8/203.2 6 5f 1.18 N/A 1.13 .sub. 5f′ 1.13 N/A 1.11 8/203.2 7 5g 1.26 N/A 1.20 .sub. 5g′ 1.17 N/A 1.03 8/203.2 8 5h 0.94 N/A 0.87 .sub. 5h′ 1.12 N/A 1.07 8/203.2** Output Water 88 C. Temperature *Distance from water inlet to center of first electrode set **Distance from center of last electrode set to water outlet
TABLE-US-00030 TABLE 14c Run ID: AT093 Flow Rate: 200 ml/min Atmosphere For Set #1 and Set #4: Reducing or Air-Deprived Target Distance Distance Average Voltage “c-c” “x” Voltage Set # Electrode # (kV) in/mm in/mm (kV) 7/177.8* 1 1a 2.04 0.22/5.59 2.02 5a 1.50 N/A 1.49 8/203.2 2 5b 0.76 N/A 0.76 .sub. 5b′ 1.02 N/A 1.03 8/203.2 3 5c 0.91 N/A 0.91 .sub. 5c′ 0.98 N/A 0.99 8/203.2 4 1d 1.38 0.19/4.83 1.39 5d 1.01 N/A 0.99 9/228.6 5 5e 0.94 N/A 0.92 .sub. 5e′ 0.39 N/A 0.38 8/203.2 6 5f 0.60 N/A 0.58 .sub. 5f′ 0.50 N/A 0.48 8/203.2 7 5g 0.68 N/A 0.65 .sub. 5g′ 0.55 N/A 0.56 8/203.2 8 5h 0.59 N/A 0.59 .sub. 5h′ 0.89 N/A 0.87 8/203.2** Output Water 75 C. Temperature *Distance from water inlet to center of first electrode set **Distance from center of last electrode set to water outlet
TABLE-US-00031 TABLE 14d Run ID: AT094 Flow Rate: 200 ml/min Atmosphere For Set #1 and Set #4: Ozone Target Distance Distance Average Voltage “c-c” “x” Voltage Set # Electrode # (kV) in/mm in/mm (kV) 7/177.8* 1 1a 2.24 0.22/5.59 2.20 5a 1.73 N/A 1.74 8/203.2 2 5b 0.93 N/A 0.95 .sub. 5b′ 1.16 N/A 1.18 8/203.2 3 5c 1.09 N/A 1.10 .sub. 5c′ 1.15 N/A 1.17 8/203.2 4 1d 1.45 0.19/4.83 1.47 5d 1.08 N/A 1.10 9/228.6 5 5e 0.99 N/A 1.00 .sub. 5e′ 0.43 N/A 0.45 8/203.2 6 5f 0.64 N/A 0.63 .sub. 5f′ 0.52 N/A 0.56 8/203.2 7 5g 0.71 N/A 0.74 .sub. 5g′ 0.63 N/A 0.64 8/203.2 8 5h 0.66 N/A 0.67 .sub. 5h′ 0.95 N/A 0.95 8/203.2** Output Water 76 C. Temperature *Distance from water inlet to center of first electrode set **Distance from center of last electrode set to water outlet
TABLE-US-00032 TABLE 14e Run ID: AT095 Flow Rate: 200 ml/min Atmosphere For Set #1 and Set #4: Helium Target Distance Distance Average Voltage “c-c” “x” Voltage Set # Electrode # (kV) in/mm in/mm (kV) 7/177.8* 1 1a 3.09 0.22/5.59 3.11 5a 2.98 N/A 2.96 8/203.2 2 5b 2.81 N/A 2.80 .sub. 5b′ 2.86 N/A 2.83 8/203.2 3 5c 2.38 N/A 2.38 .sub. 5c′ 2.32 N/A 2.30 8/203.2 4 1d 2.64 0.19/4.83 2.58 5d 2.50 N/A 2.49 9/228.6 5 5e 2.06 N/A 2.07 .sub. 5e′ 1.64 N/A 1.63 8/203.2 6 5f 1.34 N/A 1.36 .sub. 5f′ 1.31 N/A 1.31 8/203.2 7 5g 1.27 N/A 1.28 .sub. 5g′ 1.12 N/A 1.12 8/203.2 8 5h 1.08 N/A 1.08 .sub. 5h′ 1.26 N/A 1.25 8/203.2** Output Water 95 C. Temperature *Distance from water inlet to center of first electrode set **Distance from center of last electrode set to water outlet
[0566] Atomic Absorption Spectroscopy (AAS) samples were prepared and measurement values were obtained, as discussed in Example 6. Table 14f shows the results. Note that Table 14f includes a column entitled “Electrode Configuration”. This column contains characters “1” and “0”. The “1's” represent an electrode configuration corresponding to Electrode Set #1 (i.e., a 1, 5 combination). The “0's” represent an electrode combination of 5, 5′. Thus, for example, “AT091” is represented by “10010000” which means an eight electrode set combination was used to make “ATC01” and the combination corresponded to Set #1=1, 5; Set #2=5, 5; Set #3=5.5; Set #4=1, 5 and Set #5-Set #8=5, 5.
TABLE-US-00033 TABLE 14f Electrode Measured Ag Run ID Configuration PPM Atmosphere AT091 10010000 44.0 Air AT092 10010000 40.3 Nitrogen AT093 10010000 46.8 Reducing AT094 10010000 44.5 Ozone AT095 10010000 28.3 Helium
[0567] Table 14f includes a column entitled “Measured Ag PPM”. This column corresponds to the silver content of each of the eight solutions. As shown, the measured ppm produced in each of the atmospheres of air, nitrogen, reducing and ozone were substantially similar. However, the atmosphere of helium (i.e., AT095) produced a much lower ppm level. Also, the size of particulate matter in the AT095 solution was significantly larger than the size of the particulate matter in each of the other four solutions. The particulate sizes were determined by dynamic light scattering methods, as discussed above herein.
[0568] It is clear from
[0569] In an effort to determine efficacy against an E. coli bacteria (discussed in greater detail earlier herein), each of the five solutions made according to this Example 9 were all diluted to the exact same ppm for silver in order to compare their relative efficacies in a normalized manner. Accordingly, for example, samples made according to Run AT091 were diluted from 44.0 ppm down to 4 ppm; whereas the samples associated with Run AT095 were diluted from 28.3 ppm, down to 4 ppm. These samples were then further diluted to permit Bioscreen measurements to be performed, as discussed above herein.
Example 10
Manufacturing Silver-Based Nanoparticles/Nanoparticle Solution AT096, Using a Diode Bridge to Rectify an AC Power Source to Form Plasmas
[0570] This Example utilizes essentially the same basic apparatus used to make the solutions of Examples 1-5, however, this Example uses two plasmas 4 formed by a DC-like Power Source (i.e., a diode bridge-rectified power source). Specifically, for Electrode Set #1 and Electrode Set #4, this Example uses a “1, 5” electrode configuration wherein the electrode 1 creates a plasma 4 in accordance with the power source shown in
[0571] Table 15 summarizes portions of electrode design, configuration, location and operating voltages. As shown in Table 15, the target voltages were set to a low of about 400 volts (Electrode Set #4) and a high of about 1,300 volts (Electrode Set #3).
[0572] Further, bar charts of the actual and target voltages for each electrode in each electrode set, are shown in
TABLE-US-00034 TABLE 15 Run ID: AT096 Flow Rate: 200 ml/min Target Distance Distance Average Voltage “c-c” “x” Voltage Set # Electrode # (kV) in/mm in/mm (kV) 7/177.8* 1 1a 0.76 0.19/4.83 0.69 5a 0.68 N/A 0.68 8/203.2 2 5b 1.25 N/A 1.22 .sub. 5b′ 1.13 N/A 1.11 8/203.2 3 5c 1.18 N/A 1.15 .sub. 5c′ 1.28 N/A 1.27 8/203.2 4 1d 0.41 0.19/4.83 0.47 5d 0.64 N/A 0.63 9/228.6 5 5e 1.02 N/A 0.99 .sub. 5e′ 0.93 N/A 0.91 8/203.2 6 5f 0.76 N/A 0.74 .sub. 5f′ 0.76 N/A 0.76 8/203.2 7 5g 0.91 N/A 0.90 .sub. 5g′ 0.80 N/A 0.79 8/203.2 8 5h 0.75 N/A 0.74 .sub. 5h′ 0.93 N/A 0.93 8/203.2** Output Water 80 C. Temperature *Distance from water inlet to center of first electrode set **Distance from center of last electrode set to water outlet
[0573] Atomic Absorption Spectroscopy (AAS) samples were prepared and measurement values were obtained, as discussed in Example 6. Table 15a shows the results. Note that Table 15a includes a column entitled “Electrode Configuration”. This column contains characters “1*” and “0”. The “1*” represents an electrode configuration corresponding to Electrode Set #1 (i.e., a 1, 5 combination, wherein the electrode 1 is negatively biased and the electrode 5 is positively biased. The “0's” represent an electrode combination of 5, 5′.
TABLE-US-00035 TABLE 15a Electrode Measured Ag Run ID Configuration PPM Atmosphere AT096 1*001*0000 51.2 Air
[0574] Table 15a includes a column entitled “Measured Ag PPM”. This column corresponds to the silver content of the solution. As shown, the measured ppm was 51.2 ppm, which was substantially higher than any other samples made by the other eight electrode sets utilized in any other Example.
[0575] In an effort to determine efficacy against an E. coli bacteria (discussed in greater detail earlier herein), this solution AT096 was tested against each of the five solutions made according to Example 9 above herein. Specifically, all of the five solutions from Example 9 and AT096 were diluted to the exact same ppm for silver in order to compare their relative efficacies in a normalized manner as discussed in Example 9.
[0576] The atmosphere used for AT096 was air, and the corresponding spectra of the air plasma is shown in
[0577] Similarly,
Example 11
Efficacy and Cytotoxicity Testing of Related Nanoparticle Solutions
[0578] This Example follows the teachings of Examples 2 [AT060], 3 [AT031-AT064] and 4 [BT006-BT012] to manufacture two different silver-based nanoparticle/nanoparticle solutions and one zinc-based nanoparticle/nanoparticle solution. Additionally, a new and different solution (i.e., PT001) based in part on the inventive process for making BT006 and BT012 was also produced. Once produced, three solutions were tested for efficacy and cytotoxicity.
[0579] Specifically, the solution made by the method of Example 2 (i.e., AT060) was tested for cytotoxicity against Murine Liver Epithelial Cells, as discussed above herein. The results are shown in
[0580] Mixtures of the materials (i.e., AT060, AT064 and BT012) were then made in order to form GR5 and GR8, in accordance with what is shown in Table 8 herein relating to the solutions GR5 and GR8. Specifically. AT064 and BT012 were mixed together to form GR5; and AT060 and BT012 were mixed together to form GR8 to result in the amounts of silver and zinc in each being the same as what is shown in Table 8.
[0581] Once the solutions of GR5 and GR8 were formed, the cytotoxicity for each was measured. Specifically, as shown in
[0582] In comparison,
[0583] The other inventive material in this Example 11, “PT001”, was made by the following process. Electrode Set #1 was a 1, 5 combination. Electrode Set #2 was also a 1, 5 combination. There were no electrode sets at positions 2-8. Accordingly, the designation for this electrode combination was a “11XXXXXV”. The composition of each of electrodes 1 and 5 in both Electrode Sets #1 and #2 were high-purity platinum (i.e., 99999%). Table 16a sets forth the specific run conditions for PT001.
[0584] Further, bar charts of the actual and target voltages for each electrode in each electrode set, are shown in
TABLE-US-00036 TABLE 16a Run ID: PT001 Flow Rate: 150 ml/min Target Distance Distance Average Voltage “c-c” “x” Voltage Set # Electrode # (kV) in/mm in/mm (kV) 7/177.8* 1 1a 1.90 .22/5.59 2.00 5a 1.37 N/A 1.51 8/203.2 2 1b 0.78 .22/5.59 0.87 5b 0.19 N/A 0.18 57/1447.8** N/A N/A N/A N/A N/A N/A Output Water 49 C. Temperature *Distance from water inlet to center of first electrode set **Distance from center of last electrode set to water outlet
[0585] The solution PT001 was then treated as if it had an equivalent volume of zinc-based nanoparticles equivalent to those present in BT012 (i.e., 23 ppm zinc). In other words, a volume of about 150 ml of PT001 was added to about 50 ml of AT064 to produce GR5* and a volume of about 170 ml of PT001 was added to about 33 ml of AT060 to produce GR8*. Once mixed, these new material solutions (i.e., GR5* and GR8*) were allowed to sit for 24 hours prior to being tested for cytotoxicity.
[0586]
[0587] Likewise,
[0588] Accordingly, the LD.sub.50 of each of GR5* and GR8* was higher than the corresponding LD.sub.50's of GR5 and GR8, respectively (i.e., with regard to the silver content in each of the mixes GR5 and GR8).
[0589] The biological efficacies against E coli of each of GR5 and GR5* were then compared. Specifically,
[0590] Likewise, a comparison between the biological efficacy against E. coli was also performed for GR8 and GR8*. This comparison is shown in
[0591] Accordingly, this Example shows that cytotoxicity of solutions GR5 and GR8 can be lowered by utilizing the solution PT001 instead of BT012 in each of the mixes GR5 and GR8. Moreover, such cytotoxicity is lowered without sacrificing biological efficacy against E. coli, as shown in
[0592] However, it should be understood that other in vivo benefits can be obtained by the presence of, for example, the material corresponding to BT012 in the solutions GR5 and GR8.
Example 12
Comparison of Biological Performance of Two Different Silver-Based Nanoparticles/Nanoparticle Solutions by Adding Variable Zinc Nanoparticles/Nanoparticle Solutions and Related Aging Study
[0593] The materials disclosed in Example 11, namely AT064 and AT060 and an equivalent to BT012 (i.e., BT013) were mixed together in varying proportions to determine if any differences in biological efficacy could be observed (e.g., similar to the studies shown in
[0594] Specifically.
[0595] Specifically,
[0596]
[0597] However, the biological efficacy results are dramatically different in
[0598] Additional biological efficacy tests were run to determine if additional “hold time” had any further enhancing effects. Specifically, the data in
[0599] In an effort to clarify the differences in biological efficacy observed in
[0600] Specifically, two sets of DLS tests were performed. The first test mixed together AT064 and BT013 in proportion to produce GR5 (i.e., about 50 ml of AT064 and about 150 ml of BT013). The second test mixed together AT060 and BT013 in proportion to produce GR8 (i.e., about 33 ml of AT060 and about 170 ml of BT013).
[0601] The results of the DLS measurements as a function of time after mixing the aforementioned materials together are shown in
[0602] It is clear from the results shown in
[0603] Without wishing to be bound by any particular theory or explanation, it appears that particle size and biological performance (e.g., efficacy against E. coli) are related.