US 10,120,106 B2 · Preparation methods and uses of doped VIB group metal oxide nanoparticles or dispersions thereof

Abstract

The present invention is related to a method for preparing VIB Group metal oxide particles or dispersions, wherein the VIB Group metal is tungsten or molybdenum. The methods include: 1) providing precursors of VIB Group metal oxide, reductants and supercritical fluids. 2) said VIB Group metal oxide particles, or dispersions are obtained by the reaction between said metal oxide precursors, and reductants are under supercritical state in said supercritical fluids. Especially, said VIB Group metal oxide can be tungsten bronze, molybdenum bronze, or tungsten and molybdenum bronze which can be present by the formula AxByMOz. Wherein, A represents element exists in the form of dopant cation; and B represents element exists in the form of dopant anion; O represents oxygen; 0≤x≤1, 0≤y≤1, 0<x+y≤1, and 2≤z≤3. The said VIB Group metal oxide particles and dispersions can be applied to the glasses of houses, buildings, automobiles, ships etc, with high transparency and NIR and UV lights shielding properties, by which the control of sunlight and heat radiation can be achieved.

Claims15

Dependent claims

A method for preparing VIB Group metal oxide particles or a dispersion thereof, the method comprising:

1) reacting a salt solution of the VIB Group metal with a precipitating agent solution to produce colloid particles of an acid of the VIB Group metal;
2) removing impurities from the colloid particles to obtain purified colloid particles;
and
3) reacting the purified colloid particles with a reductant in a supercritical fluid under a supercritical state to obtain the VIB Group metal oxide particles or the dispersion thereof, wherein the supercritical fluid under the supercritical state is substantially free of a solvent that is not a supercritical fluid under the supercritical state, wherein the VIB Group metal is molybdenum, tungsten, or both, and the acid of the VIB Group metal is tungstic acid, molybdic acid, or both,
wherein a concentration of the VIB Group metal oxide particles or the dispersion thereof in the supercritical fluid is in the range of 0.25 mol/L to 0.33 mol/L, and wherein the supercritical state has a temperature ranging from 150-400° C. and a pressure ranging from 1-30 atm.

2 more elements

Dependencies are inferred from the claim text.

Preparation methods and uses of doped VIB group metal oxide nanoparticles or dispersions thereof

Life of this patent

Preparation methods and uses of doped VIB group metal oxide nanoparticles or dispersions thereof

Life of this patent

Abstract

Claims15