The present invention is polishing particles for polishing a synthetic quartz glass substrate. The polishing particles contain cerium-based polishing particles and have a breaking strength, which is measured by a compression tester, of 30 MPa or more. This provides polishing particles for polishing a synthetic quartz glass substrate while sufficiently reducing generation of defects due to polishing.

A thermochemical method for storing and releasing thermal energy by means of a compound in solid form of formula AO.sub.xB.sub.y.zH.sub.2O, in which: A is an element selected from uranium (U) and thorium (Th); O is the element oxygen; B is an anion or an oxoanion; x is a number comprised between 0 and 4; y is a number comprised between 0 and 2; z is a number greater than 0 and less than 10; it being understood that at least one of x and y is different from 0 and that the compound of formula Th(SO.sub.4).sub.2.xH.sub.2O is excluded.

Lutetium oxide-based scintillator materials, as well as corresponding methods and systems, are described.

Lutetium oxide-based scintillator materials, as well as corresponding methods and systems, are described.

A method for purifying uranium includes forming primary uranyl peroxide precipitates (UO.sub.2O.sub.2.4H.sub.2O). Forming the primary uranyl peroxide precipitates includes obtaining impure uranium dissolved in an acidic solution, evaporating the acidic solution to increase uranium concentration and to form a concentrated solution, mixing a hydrogen peroxide (H.sub.2O.sub.2) solution with the concentrated solution in a first container, and forming uranyl peroxide precipitates in the first container. The method includes collecting the uranyl peroxide precipitates and washing and drying the uranyl peroxide precipitates. The method also includes converting the washed and dried uranyl peroxide precipitates into triuranium octoxide (U.sub.3O.sub.8).

A method for purifying uranium includes forming primary uranyl peroxide precipitates (UO.sub.2O.sub.2.4H.sub.2O). Forming the primary uranyl peroxide precipitates includes obtaining impure uranium dissolved in an acidic solution, evaporating the acidic solution to increase uranium concentration and to form a concentrated solution, mixing a hydrogen peroxide (H.sub.2O.sub.2) solution with the concentrated solution in a first container, and forming uranyl peroxide precipitates in the first container. The method includes collecting the uranyl peroxide precipitates and washing and drying the uranyl peroxide precipitates. The method also includes converting the washed and dried uranyl peroxide precipitates into triuranium octoxide (U.sub.3O.sub.8).

The invention includes apparatus and methods for instantiating rare earth metals in a nanoporous carbon powder.

The present disclosure relates to mesoporous silica wrapped nanoparticle composite nanomaterial, preparation method thereof, and use thereof. In the present disclosure, a nanoparticle is dispersed in an aqueous ethanol solution. Then, ammonia water is added to adjust the pH. After that, cetyltrimethylammonium bromide in an aqueous ethanol solution is added dropwise, and ultrasound is continued, before tetraethyl orthosilicate is added dropwise. The mixture is purified to produce a composite nanomaterial that is stable, controllable, and consistent in size; the shell of the composite nanomaterial is mesoporous silica, the core of the composite nanomaterial is a nanoparticle. Dual-core or triple-core nanoparticles of different kinds/functions can be wrapped into a single mesoporous silica shell to achieve multi-core wrapping. The method is universal and may be used to wrap various nanometers. The preparation procedure is environmentally friendly, efficient, and may be carried out at room temperature.

The present disclosure relates to mesoporous silica wrapped nanoparticle composite nanomaterial, preparation method thereof, and use thereof. In the present disclosure, a nanoparticle is dispersed in an aqueous ethanol solution. Then, ammonia water is added to adjust the pH. After that, cetyltrimethylammonium bromide in an aqueous ethanol solution is added dropwise, and ultrasound is continued, before tetraethyl orthosilicate is added dropwise. The mixture is purified to produce a composite nanomaterial that is stable, controllable, and consistent in size; the shell of the composite nanomaterial is mesoporous silica, the core of the composite nanomaterial is a nanoparticle. Dual-core or triple-core nanoparticles of different kinds/functions can be wrapped into a single mesoporous silica shell to achieve multi-core wrapping. The method is universal and may be used to wrap various nanometers. The preparation procedure is environmentally friendly, efficient, and may be carried out at room temperature.

The present invention relates to cerium oxide particles that have excellent heat resistance especially useful for catalysts, functional ceramics, solid electrolyte for fuel cells, polishing, ultraviolet absorbers and the like, and particularly suitable for use as a catalyst or co-catalyst material, for instance in catalysis for purifying vehicle exhaust gas. The present invention also relates to a method for preparing such cerium oxide particles, and a catalyst, such as for purifying exhaust gas, utilizing these cerium oxide particles.