A method for preparing silica nanoparticles includes the steps of: slowly titrating a sodium silicate solution with an acid solution to obtain a silicic acid-containing solution; continuously stirring the silicic acid-containing solution; slowly titrating the silicic acid-containing solution with the acid solution to obtain a silicic acid-enriched solution; continuously stirring the silicic acid-enriched solution; collecting the silicic acid-enriched solution as a silica nanoparticle precursor solution when a pH value of the silicic acid-enriched solution reaches a target pH value; and subjecting the silica nanoparticle precursor solution to a flame spray pyrolysis or a drying-grinding-calcining treatment.

A hybrid material for light emitting diodes, comprising a) an organopolysilazane material, comprising repeating units of formulae (I) and (II)
[SiR.sup.1R.sup.2NR.sup.3].sub.x(I)
[SiHR.sup.4NR.sup.5].sub.y(II)
wherein the symbols and indices have the following meanings: R.sup.1 is C.sub.2-C.sub.6-alkenyl or C.sub.4-C.sub.6-alkadienyl; R.sup.2 is H or an organic group; R.sup.3 is H or an organic group; R.sup.4 is H or an organic group; R.sup.5 is H or an organic group; x is 0.001 to 0.2; and y is 2x to (1x), with the proviso that x+y1 and that y can be 0 if R.sup.2 is H, and b) inorganic nanoparticles having a mean diameter in the range of from 1 to 30 nm, which are surface modified with a capping agent comprising a C.sub.1-C.sub.18-alkyl and/or C.sub.1-C.sub.18-alkenyl group,
is useful as encapsulation material for LEDs.

This invention relates to regenerable antimicrobial coatings with long-lasting efficacy for use in medical applications including implants, medical instruments or devices, and hospital equipment. The same coatings would also have broad utility in the consumer, industrial, and institutional markets. The coating technology would be based on sequestration of hydrogen peroxide (HP) by zinc oxide binders incorporated into the coatings.

Anticorrosive coating compositions as disclosed comprise a binding polymer and an aluminum phosphate corrosion inhibiting pigment dispersed therein. The coating composition comprises up to 25 percent by weight aluminum phosphate. The binding polymer can include solvent-borne polymers, water-borne polymers, solventless polymers, and combinations thereof. The aluminum phosphate is made by sol gel process of combining an aluminum salt with phosphoric acid and a base material. Aluminum phosphate colloidal particles are nanometer sized, and aggregate to form substantially spherical particles. The coating composition provides a controlled delivery of phosphate anions of 100 to 1,500 ppm, depending on post-formation treatment of the aluminum phosphate, and has a total solubles content of less than 1500 ppm, The amorphous aluminum phosphate is free of alkali metals and alkaline earth metals, and has a water adsorption potential of up to about 25 percent by weight water when present in a cured film.

The present invention provides silver nano-particles that are excellent in stability and develop excellent conductivity by low-temperature calcining, a producing method for same, and a silver coating composition comprising the silver nano-particles. A method for producing silver nano-particles comprising: preparing an amine mixture liquid comprising: an aliphatic hydrocarbon monoamine (A) comprising an aliphatic hydrocarbon group and one amino group, said aliphatic hydrocarbon group having 6 or more carbon atoms in total; an aliphatic hydrocarbon monoamine (B) comprising an aliphatic hydrocarbon group and one amino group, said aliphatic hydrocarbon group having 5 or less carbon atoms in total; and an aliphatic hydrocarbon diamine (C) comprising an aliphatic hydrocarbon group and two amino groups, said aliphatic hydrocarbon group having 8 or less carbon atoms in total; mixing a silver compound and the amine mixture liquid to forma complex compound comprising the silver compound and the amines; and thermally decomposing the complex compound by heating to form silver nano-particles.

The present disclosure relates to a hybrid nanoparticle comprising a metallic core and at least one lipophilic dendron attached to the surface of the metallic core, and methods of producing such hybrid nanoparticles. The present disclosure also relates to films containing the hybrid nanoparticles described herein.

Provided herein are highly conductive compositions (having a volume resistivity no greater than 110.sup.3 Ohms.Math.cm) using silver flake, powder or suspension in solvent for electromagnetic interference (EMI) applications. This high conductivity will allow the use of very thin films for EMI shielding protection, which in turn will be helpful to reduce package sizes. In some embodiments, the coating composition is applied on the device surface by suitable means, e.g., by an electrostatic spray process, air spray process, ultrasonic spray process, spin coating process, or the like.

The present invention provides a stain-proof coating composition including silica fine particles (A), a nonionic surfactant (B), and a nonionic surfactant (C), wherein the nonionic surfactant (B) is at least one kind of nonionic surfactant (B) selected from the group consisting of an acetylenediol-based surfactant (b-1) and a polyoxyalkylene alkyl ether-based surfactant (b-2), the nonionic surfactant (C) is at least one kind of nonionic surfactant (C) selected from the group consisting of a vinyl-based polymeric surfactant (c-1) and a polyoxyalkylene fatty acid ester-based surfactant (c-2).

There are provided a coating composition being possible to form a cured film which has excellent transparency and weather resistance, and especially hardness. A coating composition obtained by which a silicon-containing substance as a component (M) and a silica colloidal particle having a primary particle diameter of 2 to 80 nm as a component (S) are mixed, and then the component (M) is hydrolyzed, and the resulting aqueous solution is subsequently mixed with a colloidal particle (C) wherein a component (F) is a modified metal oxide colloidal particle (C) having a primary particle diameter of 2 to 100 nm, which includes a metal oxide colloidal particle (A) having a primary particle diameter of 2 to 60 nm as a core, whose surface is coated with a coating (B) formed of an acidic oxide colloidal particle.

This invention provides resin formulations which may be used for 3D printing and pyrolyzing to produce a ceramic matrix composite. The resin formulations contain a solid-phase filler, to provide high thermal stability and mechanical strength (e.g., fracture toughness) in the final ceramic material. The invention provides direct, free-form 3D printing of a preceramic polymer loaded with a solid-phase filler, followed by converting the preceramic polymer to a 3D-printed ceramic matrix composite with potentially complex 3D shapes or in the form of large parts. Other variations provide active solid-phase functional additives as solid-phase fillers, to perform or enhance at least one chemical, physical, mechanical, or electrical function within the ceramic structure as it is being formed as well as in the final structure. Solid-phase functional additives actively improve the final ceramic structure through one or more changes actively induced by the additives during pyrolysis or other thermal treatment.