Nano ammonium metatungstate is an indirect raw material for preparing ceramic microsphere. Ammonium metatungstate is used to prepare cesium tungsten bronze nanoparticles, and the obtained cesium tungsten bronze is the direct raw material for producing thermal insulating ceramic particles. In any case, these new heat insulation particles will be used to prepare building heat insulation films. One of the important raw materials, cesium tungsten bronze nanoparticles, that is, cesium tungsten bronze nanopowder. So, what are the chemical preparation methods for nanopowder?
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One of the chemical preparation methods of nanopowder is hydrothermal method. Hydrothermal technology has two characteristic. First, it has relatively low temperature. Second, it avoids component evaporation as it is reacted in a closed container. Compared with the general wet chemical method, hydrothermal method can directly obtain a powder which is well dispersed and crystallized. And it does not need to be subjected to high temperature burning treatment, thereby avoiding the hard agglomeration of the powder which may be formed. The crystal structure, crystal morphology and crystal purity of the nanoparticles were controlled by the adjustment of experimental conditions in the hydrothermal process.
