An alumina powder containing alumina particles, wherein among the alumina particles, an average sphericity of an alumina particle having a projected area equivalent circle diameter of 50 nm or more as determined by microscopy is 0.80 or more, a content ratio of an alumina particle having a particle diameter of 75 μm or more is 0.05% by mass or less, an average particle diameter of the alumina powder is 0.2 μm or more and 15 μm or less, the average particle diameter is a particle diameter measured using a laser light diffraction scattering particle size distribution analyzer, and an amount of water included in the alumina powder measured by a specific measurement method is 30 ppm or more and 500 ppm or less.

The purpose of the present invention is to provide a method for producing particles and an apparatus for producing particles, wherein fine particles can be more conveniently obtained compared to conventional top-down methods for generating fine particles, and spherical fine particles can be obtained like bottom-up methods for generating fine particles. An aspect of the present invention pertains to a method for producing particles, the method comprising: a step for mixing a substance containing a metal and/or a semi-metal with an explosive; a step for burning the explosive to cause a combustion reaction of the substance; and a step for capturing particles in a combustion gas obtained in the combustion reaction step.

The disclosure related to a method for making a nanowire structure. First, a free-standing carbon nanotube structure is suspended. Second, a metal layer is coated on a surface of the carbon nanotube structure. The metal layer is oxidized to grow metal oxide nanowires.

The disclosure related to a method for making a nanowire structure. First, a free-standing carbon nanotube structure is suspended. Second, a metal layer is coated on a surface of the carbon nanotube structure. The metal layer is oxidized to grow metal oxide nanowires.

A method for obtaining aluminum-containing nanoparticles is provided. The method includes exposing at least one surface comprising aluminum to an alkaline aqueous solution. The method further includes exposing the at least one surface to electro-hydraulic shock waves and an electron flux. The at least one surface undergoes electro-erosion which creates alumina-hydrated nanoparticles having a negative surface electrical charge. The method further includes transforming the alumina-hydrated nanoparticles into aquachelate nanoparticles by attaching water molecules to the alumina-hydrated nanoparticles.

A method for obtaining aluminum-containing nanoparticles is provided. The method includes exposing at least one surface comprising aluminum to an alkaline aqueous solution. The method further includes exposing the at least one surface to electro-hydraulic shock waves and an electron flux. The at least one surface undergoes electro-erosion which creates alumina-hydrated nanoparticles having a negative surface electrical charge. The method further includes transforming the alumina-hydrated nanoparticles into aquachelate nanoparticles by attaching water molecules to the alumina-hydrated nanoparticles.

The present invention relates to a method for the production of aluminum oxide particles of spherical morphology and with a particles size in the submicron range.

The present invention relates to a method for the production of aluminum oxide particles of spherical morphology and with a particles size in the submicron range.

A system for producing hydrogen gas, heat and an oxide component using a water splitting process is disclosed. The system involves a dry first chamber containing a passivating-oxide preventing reagent that receives a solid material feedstock and dissolves the solid material feedstock in the passivating-oxide preventing reagent. The passivating-oxide preventing reagent becomes saturated with the solid material in the first chamber and is then transferred to a second chamber without contact with water. In the second chamber, the solid material saturated in the passivating-oxide preventing reagent reacts with the water so as to generate hydrogen gas, an oxide component and heat. Following the reaction, the solid material depleted passivating-oxide preventing reagent and water is recycled to be re-used in the water splitting process.

A system for producing hydrogen gas, heat and an oxide component using a water splitting process is disclosed. The system involves a dry first chamber containing a passivating-oxide preventing reagent that receives a solid material feedstock and dissolves the solid material feedstock in the passivating-oxide preventing reagent. The passivating-oxide preventing reagent becomes saturated with the solid material in the first chamber and is then transferred to a second chamber without contact with water. In the second chamber, the solid material saturated in the passivating-oxide preventing reagent reacts with the water so as to generate hydrogen gas, an oxide component and heat. Following the reaction, the solid material depleted passivating-oxide preventing reagent and water is recycled to be re-used in the water splitting process.