Disclosed is a hexagonal boron nitride powder having excellent glitter property. A hexagonal boron nitride powder includes hexagonal boron nitride particles, in which among the hexagonal boron nitride particles, a number ratio of particles having a bent structure at an angle of 110° to 160° with respect to (0,0,1) crystal plane of the primary particles is 30% or more.

A porous silicon material including silicon nanoparticles and clusters of silicon nanoparticles, where the pores are cooperatively defined by the nanoparticles within the clusters.

Alumina products containing a fine particle size component and a coarse particle size component, and with specific particle size characteristics and irregular and non-spherical particle shapes, are disclosed. These alumina products can be used in polymer formulations to produce composites having high isotropic thermal conductivity.

A process of preparing polycrystalline group III nitride chunks comprising the steps of (a) placing a group III metal inside a source chamber; (b) flowing a halogen-containing gas over the group III metal to form a group III metal halide; (c) contacting the group III metal halide with a nitrogen-containing gas in a deposition chamber containing a foil, the foil comprising at least one of Mo, W, Ta, Pd, Pt, Ir, or Re; (d) forming a polycrystalline group III nitride layer on the foil within the deposition chamber; (e) removing the polycrystalline group III nitride layer from the foil; and (f) comminuting the polycrystalline group III nitride layer to form the polycrystalline group III nitride chunks, wherein the removing and the comminuting are performed in any order or simultaneously.

Disclosed is a catalyst for oxygen reduction and evolution reactions. The catalyst is in the form of nickel sulfide (NiS.sub.2) nanosheets. NiS.sub.2 molecules are cross-linked and oriented two-dimensionally in the NiS.sub.2 nanosheets. Also disclosed is a method for producing the catalyst.

The present document describes a carbon allotrope-silica composite material comprising a silica microcapsule comprising a silica shell having a thickness of from about 50 nm to about 500 μm, and a plurality of pores, said shell forming a capsule having a diameter from about 0.2 μm to about 1500 μm, and having a density of about 0.001 g/cm3 to about 1.0 g/cm3, wherein said shell comprises from about 0% to about 70% Q3 configuration, and from about 30% to about 100% Q4 configuration, or wherein said shell comprises from about 0% to about 60% T2 configuration and from about 40% to about 100% T3 configuration, or wherein said shell comprises a combination of T and Q configurations thereof, and wherein an exterior surface of said capsule is covered by a functional group; a carbon allotrope attached to said silica microcapsule. Also described is a carbon allotrope-silica composite material comprising a carbon allotrope attached to a silica moiety comprising a silica nanoparticle having a diameter from about 5 nm to about 1000 nm, wherein an exterior surface of said silica nanoparticle is covered by a functional group.

Provided is a kaolin having a finer particle size and a narrower particle size distribution, in combination with suitable morphology. Also provided are a method of preparing the kaolin product and methods of use.

Alumina products containing a fine particle size component and a coarse particle size component, and with specific particle size characteristics and irregular and non-spherical particle shapes, are disclosed. These alumina products can be used in polymer formulations to produce composites having high isotropic thermal conductivity.

Disclosed herein is a method for efficiently producing a cathode active material for a lithium ion secondary battery excellent in battery performance such as initial discharge capacity.

The cathode active material for a lithium ion secondary battery is produced from spherical particles made of a lithium nickel cobalt composite oxide represented by a general formula: Li.sub.zNi.sub.1−x−yCo.sub.xM.sub.yO.sub.2 (wherein M is at least one element selected from among Mn, V, Mg, W, Mo, Nb, Ti, and Al and x, y, and z satisfy 0<x≤0.35, 0≤y≤0.35, and 0.97≤z≤1.20, respectively) and having a volume average particle diameter MV in a range of preferably 8 to 30 μm, wherein an area ratio of a lithium compound unevenly distributed on surfaces of the particles in a SEM image is 5% or less. The spherical particles preferably have a crystallite diameter in a range of 50 to 200 Å as determined from a full width at half maximum, FWHM of diffraction peak of (003) plane obtained by X ray diffraction by using Sherrer formula.

Disclosed are a pharmaceutical use of a gold cluster and a substance containing the gold cluster and the preparation method and use thereof. The gold cluster and substance containing the gold cluster can inhibit the aggregation of Aβ and α-syn, has excellent effects on the levels of cell models and animal models, and can be used to prepare drugs for preventing and treating Alzheimer's disease and/or Parkinson's disease.