Tungsten Oxide

Sol gel method is widely used abroad, a kind of nano material preparation method, its principle is the prepared precursor (such as inorganic salt or metal alkoxide) dissolved in small molecule solvent in solution by mixing made uniform, solute and solvent hydrolysis reaction, hydrolysis condensation the reaction of nano particles and the formation of integrated sol. On the basis of the prepared sol, different processes can be used to prepare nano thin films and ultrafine powders with different properties. There are several ways to prepare tungsten trioxide thin films by sol-gel method: 1. Tungstic acid hydrochloric acid method; 2. Tungsten powder peroxide polytungstic acid method; 3. Tungstic acid colloid solution is prepared by ion exchange; 4. Polymer method. The traditional sol-gel method mostly controls the particle size of powders by controlling pH value, temperature and adding surfactants. Recently, some scholars have successfully controlled the particle size of WO 3  powder...

Sol-gel method is first used for glass and ceramic production, it refers to metal inorganic compounds, metal organic compounds or a mixture of the two under the action of surfactants. The process of preparing tungstate by the process of sol-gel and drying, roasting and other heat treatment process. Modern sol-gel method is mainly used to prepare nano film coating, for example, in optical field, some kind of optical film (such as high reflectivity film, low reflectivity film and waveguide film) is often needed. Sol-gel method can prepare nano tungstate by controlling the temperature, colloid composition, particle size of precursor and pH value in liquid. The advantage of sol-gel method is that: 1. The chemical homogeneity is good. Because the sol is prepared by the solution in the process of sol-gel, the chemical composition between the colloidal particles and the colloidal particles is exactly the same. 2. High purity; 3. Particle size is less than 0.1 um. 4. This method c...