Nano Tungstate Preparation by Sol-Gel Method
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...