According to the present invention, there is provided a means for producing an aluminum hydroxide-coated SiC particle powder having a coating layer containing aluminum hydroxide on a surface of SiC particles. The present invention relates to a method for producing an aluminum hydroxide-coated SiC particle powder, which includes a coating step of maintaining a pH of a dispersion containing SiC particles, sodium aluminate, and water in a range of from 9 to 12 and forming coated particles having a coating layer containing aluminum hydroxide on a surface of the SiC particles.

Core particles produced in situ or introduced as preformed core particles are coated with a layer of carbon. Non-carbon as well as some carbon-based core materials can be utilized. The resulting carbon coated particles can find applications in rubber products, for instance as reinforcement for tire components.

A dispersion that inorganic oxide microparticles may be dispersed at a high concentration in a solvent, a composition for film formation having high transparency, high refractive index and adhesion to a base layer. Inorganic oxide microparticles wherein an amphiphilic organosilicon compound having one or more selected from a polyoxyethylene group, a polyoxypropylene group, or a polyoxybutylene group as a hydrophilic group, and one or more selected from a C.sub.1-18 alkylene group or a vinylene group as a hydrophobic group bonded to a surface of modified metal oxide colloidal particles (C) having a primary particle diameter of 2 to 100 nm, the modified metal oxide colloidal particles wherein a surface of metal oxide colloidal particles (A) having a primary particle diameter of 2 to 60 nm as a nucleus is coated with a coating material (B) including metal oxide colloidal particles having a primary particle diameter of 1 to 4 nm.

The object of the present invention is to provide silica particles which can provide a silica particle dispersion exhibiting excellent uniformity. The present invention is silica particles having an average primary particle diameter d.sub.BET calculated from a specific surface area by a BET method of 1 nm or more and 100 nm or less and a ratio (d.sub.DLS/d.sub.BET) of an average secondary particle diameter d.sub.DLS measured by a dynamic light scattering method to the d.sub.BET of 1.2 or less. The silica particles of the present invention preferably have a coefficient of variation in a particle diameter measured using a transmission electron microscope at a magnification of 200,000 of 20% or less.

Provided is a method for manufacturing core-shell-type porous silica particles, the method including: a preparation step for preparing an aqueous solution containing non-porous silica particles, a cationic surfactant, a basic catalyst, a hydrophobic part-containing additive, and an alcohol; a shell precursor formation step for adding a silica source to the aqueous solution to form a shell precursor on the surfaces of the non-porous silica particles; and a shell formation step for removing the hydrophobic part-containing additive and the cationic surfactant from the shell precursor to form a porous shell.

Embodiments of the present disclosure describe burner (10) configurations used in an industrial process to convert methane to olefins, aromatics, and nanoparticles/nanomaterials. Both a vitiated coflow burner and piloted turbulent burner with inhomogeneous inlets are disclosed.

A silica composite particle includes a silica particle and a compound in which a metal atom selected from the group consisting of Ti, Al, Zr, V, and Mg bonds to an organic group through oxygen, the silica particle being surface-treated with the compound. A coverage of a surface of the silica composite particle with the metal atom is 0.01 at % or more and 30 at % or less. When a binding energy peak of O1s in an oxide of the metal atom is assumed to be MO1s, a binding energy peak of O1s in SiO.sub.2 is assumed to be SO1s, and a binding energy peak of O1s in the silica composite particle is assumed to be MSO1s, the binding energy peaks being detected by X-ray photoelectron spectroscopy, the formula 0.000452X.sup.20.059117X+SO1s<MSOs(SO1sMO1s)/100X+SO1s is satisfied.

Core particles produced in situ or introduced as preformed core particles are coated with a layer of carbon. Non-carbon as well as some carbon-based core materials can be utilized. The resulting carbon coated particles can find applications in rubber products, for instance as reinforcement for tire components.

An object to be achieved by the present invention is to provide a pigment which is comfortable and smooth to the touch in a coating, spreads well on the skin, for example, when used in a cosmetic material such as a foundation or an eye shadow, and exhibits good color development and gloss. A pigment of the present invention is a coated pigment formed by coating a surface of a flaky base material made of at least one metal or metal oxide with a colorant. The surface of the flaky base material has a coarse particle area fraction of 9% or less. Further, it is preferable that the flaky base material be at least one or more selected from the group consisting of mica, aluminum, alumina, and glass.

A composite particle of the present invention includes an inorganic particle and a graphene oxide particle that coats at least a part of the inorganic particle, and the graphene oxide particle is a modified graphene oxide particle having a surface modified with a hydrocarbon group optionally having a substituent.