Abstract:
The present invention aims to provide a simple and efficient method for manufacturing α-alumina particles, main component particles of which each have a crystal face other than the face [001] as a main crystal face and a polyhedral shape other than a hexagonal bipyramidal shape. According to the method for manufacturing α-alumina particles of the present invention, when an aluminum compound is calcined in the presence of a specific content of a metal compound, α-alumina particles each having a particle diameter of 50 μm or less, a degree of α crystallization of 90% or more, and a polyhedral shape can be obtained.
Abstract:
Provided are core-shell nanoparticles including a metal nanoparticle core and a shell layer composed of an oxide hybridized with a polyamine containing primary amino groups and/or secondary amino groups, core-shell metal nanoparticles prepared by removing the organic component from the shell layer and including a metal nanoparticle core and a shell layer based on silica, and simple and efficient methods for manufacturing such nanoparticles. Provided are a method for manufacturing a core-shell nanoparticle including performing a sol-gel reaction of an oxide source (C′) in the presence of a metal nanoparticle (A) having thereon a layer of a compound (B) containing a polyamine segment (b1) containing primary amino groups and/or secondary amino groups, a method for manufacturing a core-shell metal nanoparticle further including performing a sol-gel reaction of an organosilane to form a shell layer containing a polysilsesquioxane (D), and nanoparticles prepared by such methods.
Abstract:
Provided is a particle-containing grease composition that can efficiently improve friction and wear resistance properties with a small added amount and exhibits excellent friction and wear resistance properties even when a clearance and the surface roughness of the friction surface in sliding parts are extremely small. The particle-containing grease composition includes base oil, a thickener, and molybdenum disulfide particles, in which a median diameter D50 of the molybdenum disulfide particles determined by a dynamic light scattering method is 10 nm or more and less than 450 nm.
Abstract:
Provided is a particle-containing resin composition having an appropriate particle size and being capable of improving friction and wear resistance properties even under a high temperature and high load environment. The particle-containing resin composition according to the present invention includes a resin composition and molybdenum disulfide particles, in which a median diameter D50 of the molybdenum disulfide particles determined by a dynamic light scattering method is 10 nm or more and 1,000 nm or less.
Abstract:
Provided are a noble metal adsorbent, a method for recovering a noble metal, and a method for regenerating a noble metal adsorbent that can easily recover noble metal while high adsorption performance for noble metals is achieved. The noble metal adsorbent according to the present invention includes a metal sulfide. The metal sulfide is constituted of, for example, molybdenum disulfide particles. The method for recovering a noble metal according to the present invention includes adsorbing a noble metal onto the noble metal adsorbent, and thereafter heating and volatilizing the noble metal adsorbent in the presence of oxygen to recover the noble metal.
Abstract:
Provided is a molybdenum trioxide powder containing an aggregate of primary particles containing a crystal structure of molybdenum trioxide, the crystal structure containing α crystals with an average crystallite size of 50 nm or less, a median diameter D50 of the primary particles being 2,000 nm or less determined by dynamic light scattering.
Abstract:
Provided are organic-inorganic hybrid silica nanoparticles having excellent monodispersity, an organic component (polymer) being introduced into a silica matrix, the whole of each particle being composed of a hybrid between the organic component and an inorganic component [silica], and the particle diameter being in the range of 5 to 100 nm; and a simple and efficient method for producing the silica nanoparticles. Organic-inorganic hybrid silica nanoparticles contain a copolymer (A) composed of an amorphous polyamine chain and a nonionic polymer chain, an acidic group-containing compound (B), and silica (C). A method for producing organic-inorganic hybrid silica nanoparticles includes the steps of allowing a copolymer (A) composed of an amorphous polyamine chain and a nonionic polymer chain to associate with an acidic group-containing compound (B) in a medium and then performing a sol-gel reaction of a silica source using the association product as a reaction field in the presence of water.
Abstract:
The present invention relates to a monodisperse core-shell silica nanoparticle including a core layer based on a hydrophobic organic segment (a2) portion of a copolymer (A) containing an aliphatic polyamine chain (a1) containing primary amino groups and/or secondary amino groups and the hydrophobic organic segment (a2) and a shell layer composed of a hybrid based on the aliphatic polyamine chain (a1) portion and silica (B), and also relates to a method for manufacturing such a core-shell silica nanoparticle, a method for manufacturing a hollow silica nanoparticle from such a core-shell silica nanoparticle, and a hollow silica nanoparticle manufactured by this method of manufacture.
Abstract:
A molybdenum sulfide powder according to the invention contains molybdenum disulfide having a 3R crystal structure. A heavy-metal adsorbent according to the invention contains molybdenum sulfide particles, and the molybdenum sulfide particles have a median diameter D50 of 10 nm to 1,000 nm obtained by a dynamic light scattering type particle diameter distribution measuring device. A photothermal conversion material according to the invention contains a material containing molybdenum sulfide particles and generates heat by absorbing light energy.
Abstract:
A hydrogen generation catalyst according to a first aspect of the present invention contains a molybdenum sulfide powder containing molybdenum disulfide having a 3R crystal structure. A hydrogen generation catalyst according to a second aspect of the present invention contains a metal-doped molybdenum sulfide powder containing a doping metal in Groups 3 to 13 and molybdenum disulfide having a 3R crystal structure.