A composite oxide powder including a composition formula (1), wherein the ratio α/β of a surface area value α(m.sup.2/g) calculated by a BET one-point method to a surface area value β(m.sup.2/g) calculated from a formula (2) is greater than 1.0 and equal to or less than 1.5 and the surface area value α is equal to or less than 20 m.sup.2/g. ABO.sub.3-δ (1) (wherein A is one or more types of elements (La, Sr, Sm, Ca and Ba), B is one or more types of elements (Fe, Co, Ni and Mn) and 0≤δ<1); and surface area value β(m.sup.2/g)=specific surface area value γ- surface area value ε(2) (the specific surface area value γ(m.sup.2/g) is a value in a total pore size range measured by a mercury intrusion method.The specific surface area value ε(m.sup.2/g) is a value in a range of pore sizes that are larger than a 50% cumulative particle size.

The invention relates to a process for preparing aluminates of the general formula (I)

A.sub.1B.sub.xAl.sub.12-xO.sub.19-y where A is at least one element from the group consisting of Sr, Ba and La, B is at least one element from the group consisting of Mn, Fe, Co, Ni, Rh, Cu and Zn, x=0.05-1.0, y is a value determined by the oxidation states of the other elements, which comprises the steps (i) provision of one or more solutions or suspensions comprising precursor compounds of the elements A and B and also a precursor compound of aluminum in a solvent, (ii) conversion of the solutions or suspensions or the solutions into an aerosol, (iii) introduction of the aerosol into a directly or indirectly heated pyrolysis zone, (iv) carrying out of the pyrolysis and (v) separation of the resulting particles comprising hexaaluminate of the general formula (I) from the pyrolysis gas.

This magnesium oxide powder contains secondary particles in which a plurality of primary particles of magnesium oxide having a crystal phase and a grain boundary phase are at least partially fused together by the grain boundary phase, and a median diameter obtained by a laser diffraction scattering method is 300 .Math.m or less.

A method of making CuAg.sub.3PO.sub.4 nanoparticles is provided. The method includes forming a mixture of at least one silver salt, at least one phosphate salt, and at least one copper (II) salt. The method further includes dissolving the mixture in water. The method further includes sonicating the mixture. The method further includes precipitating the CuAg.sub.3PO.sub.4 nanoparticles or nanoparticles. The copper is present in the nanoparticles in an amount of 2 to 23 weight percent (wt. %) based on the total weight of the CuAg.sub.3PO.sub.4. The nanoparticles of the present disclosure find application in treating cervical cancer, and colorectal cancer. The nanoparticles may also be used in photodegrading environmental pollutants.

A carbon nanomaterial for gas storage and a method for manufacturing the same are provided. The specific surface area of the carbon nanomaterial for gas storage is greater than 2000 m2/g. The mesopore volume of the carbon nanomaterial for gas storage is greater than the micropore volume of the carbon nanomaterial for gas storage, and the carbon nanomaterial for gas storage has a peak intensity ratio (ID/IG) between G band and D band, as determined from the Raman spectrum, between 1.1 and 2. In the carbon nanomaterial for gas storage, the pore volume of pores with a pore width of 6 nm or less is bigger than that of pores with a pore width greater than 6 nm.

A method for preparing a meso crystal of silver oxide containing silver peroxide is provided. A quantum crystal of silver thiosulfate complex on a substrate or a particle made of copper metal or copper alloy is subjected to treating by an alkaline aqueous solution containing halogen ion to obtain a meso crystal of silver oxide containing the silver peroxide. The meso crystal of silver oxide having nanometer scale, containing a silver peroxide, the silver oxide nanocrystal being a superstructure three-dimensionally arranged in the shape of a neuron provided with properties being negatively charged in water and able to be reduced to a silver nanoparticle by a laser radiation.

A carbon dioxide adsorbent includes a porous metal oxide represented by Chemical Formula 1, the porous metal oxide having a specific surface area of greater than or equal to about 30 m.sup.2/g, and an average pore size of greater than or equal to about 2 nm.

The invention includes apparatus and methods for instantiating and quantum printing materials, such as elemental metals, in a nanoporous carbon powder.

To provide a filter medium, a process for producing filter medium, a filtration device, a method for operating the filtration device, and a filtration system, which are capable of promptly regenerating the adsorption power by backwashing and realizing efficient operation of a filtration device. The filter medium of the present invention contains a carbon-based material in which a cumulative pore volume of pores having a pore radius of 2 nm or less is 25% or less with respect to a cumulative pore volume of pores having a pore radius of 50 nm or less.

This disclosure provides a unique approach for the synthesis of non-stoichiometric, mesoporous metal oxides with nano-sized crystalline wall. The as-synthesized mesoporous metal oxide is very active and stable (durability>11 h) electocatalyst in both acidic and alkaline conditions. The intrinsic mesoporous metal oxide serves as an electrocatalyst without the assistant of carbon materials, noble metals, or other materials, which are widely used in previously developed systems. The as-synthesized mesoporous metal oxide has large accessible pores (2-50 nm), which are able to facilitate mass transport and charge transfer. The as-synthesized mesoporous metal oxide requires a low overpotential and is oxygen deficient. Oxygen vacancies and mesoporosity served as key factors for excellent performance.