A production method for metal oxide particles includes: obtaining precursor particles of a metal oxide by performing a synthesis reaction of the precursor particles in the presence of an organic compound; and converting the obtained precursor particles into metal oxide particles by heating an aqueous solution containing the precursor particles to 300 C. or higher and pressurizing the aqueous solution at a pressure of 20 MPa or higher.

It is one of objects of the present disclosure to provide hexagonal plate-shaped zinc oxide particles which can be used suitably for a cosmetic, a filler, a resin composition, an infrared radiation reflective material, and a coating composition, and a method for producing the same. Hexagonal plate-shaped zinc oxide particles having a primary particle diameter of 1.1 m or more and a D90/D10 of 3.0 or less in particle size distribution.

The present invention provides a method capable of producing hexagonal plate-shaped zinc oxide having a small thickness and a small variation in the particle size. The present invention relates to a method for producing hexagonal plate-shaped zinc oxide, the method including: a step (1) of preparing a slurry mixture containing starting particulate zinc oxide, a zinc acetate solution, and a chloride; and a step (2) of heat aging the slurry mixture obtained in the step (1) at 60 C. to 100 C.

Provided is a method for producing hexagonal tungsten oxide, the method including preparing an alkaline solvent having a pH of 8 to 9, which contains at least one of water or alcohol, adding tungsten chloride to the alkaline solvent to form a first reaction solution, adding an additive to the first reaction solution to form a second reaction solution, and adding strong acid to the second reaction solution to form nanoparticles. The additive includes any one of an amine compound having 1 to 8 carbon atoms or an aliphatic hydrocarbon derivative having 10 or more carbon atoms.

A hexagonal boron nitride powder having an average longer diameter (L) of primary particles in the hexagonal boron nitride powder of more than 10.0 m and 30.0 m or less, an average thickness (D) of the primary particles in the hexagonal boron nitride powder of 1.0 m or more, a ratio of the average longer diameter (L) to the average thickness (D), [L/D], of 3.0 or more and 5.0 or less, and a content of primary particles having a ratio of a longer diameter (1) to a thickness (d), [l/d], of 3.0 or more and 5.0 or less of 25% or more, a method for producing the hexagonal boron nitride powder, and a resin composition and a resin sheet each containing the hexagonal boron nitride powder.

The formed ceramic abrasive particle includes a plurality of ceramic oxides. The particle further includes a first plurality of oxides, a second plurality of oxides, or a mixture thereof. The first plurality of oxides includes an oxide of yttrium, praseodymium, samarium, ytterbium, neodymium, lanthanum, gadolinium, dysprosium, erbium, or a combination thereof. The second plurality of oxides includes an oxide of iron, magnesium, zinc, silicon, cobalt, nickel, zirconium, hafnium, chromium, cerium, titanium, or a combination thereof. The formed ceramic abrasive particle further includes a plurality of edges, each edge having a length independently ranging from about 0.1 m to about 5000 m. The formed ceramic abrasive particle further includes a tip defined by a junction of at least two of the edges, the tip can have a radius of curvature ranging from about 0.5 m to about 80 m.

Flaky alumina particles including mullite in a surface layer of the flaky alumina particles. A method for producing flaky alumina particles including forming a mixture by mixing together an aluminum compound that contains elemental aluminum, a molybdenum compound that contains elemental molybdenum, and silicon or a silicon compound that contains elemental silicon, the aluminum compound being in an amount greater than or equal to 50 mass %, calculated as Al.sub.2O.sub.3, the molybdenum compound being in an amount less than or equal to 40 mass %, calculated as MoO.sub.3, the silicon or the silicon compound being in an amount of 0.5 mass % or greater and less than 10 mass %, calculated as SiO.sub.2, relative to a total mass of the flaky alumina particles taken as 100 mass %; and firing the mixture.

Disclosed in the present invention are near-infrared reflecting functional pigment, paint, and panel, especially, used for a vehicle pigment or the like. The pigment according to the present invention comprises: a platelet-like substrate; a first metal oxide layer coated on at least a portion of the substrate and having a refractive index of 1.8 or larger, and a second metal oxide layer coated on at least a portion of the first metal oxide layer and containing an absorbent material, wherein the pigment reflects on average at least 30% of an IR electron beam of 850-950 nm.

A method for producing fluorinated boron nitride involves heating a reactor chamber, providing boron nitride in the reactor chamber, flowing fluorine and an inert gas through the reactor chamber, and exposing the boron nitride to the flowing gases and the heat. The method may include boron nitride that is exfoliated or non-exfoliated. The fluorinated boron nitride that is produced from this method may have a hexagonal crystal structure or a cubic crystal structure. The method may additionally comprise removing the fluorinated boron nitride from the reactor chamber and mixing it with a surfactant. A suspension may comprise particles of fluorinated boron nitride suspended in a fluid, which may be polar or non-polar, and may additionally include a surfactant. The fluorinated boron nitride may have a hexagonal or a cubic crystal structure. Furthermore, the boron nitride may be exfoliated or non-exfoliated.

A thermal method of forming ferric oxide nano/microparticles with predominant morphology is described using different solvents. Methods of using the Fe.sub.3O.sub.4 nano/microparticles as catalysts in the reduction of nitro compounds with sodium borohydride to the corresponding amines and decomposition of ammonium salts.