Ammonium metatungstate nanoparticles can be used to prepare cesium tungsten bronze nano powder. The obtained cesium tungsten bronze nano particles are used for preparing near-infrared shielding material such as a transparent architectural glass heat insulating coating. As the preparation of cesium tungsten bronze is very important, the following mainly describes a preparation method of cesium tungsten bronze nanopowder, which includes the following steps:
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Step one: dissolve the reaction amount of ammonium metatungstate (tungsten raw material) and cesium nitrate (cesium raw material) in methanol (solvent), drying the above solution by oven drying method to obtain a powder. Further, the obtained powder was further pulverized by a jet milling method to obtain a mixed powder of tungsten and cesium.
Step two: place the mixed powder of tungsten and cesium in a closed reaction vessel with stirring, and sorbic acid (reaction solvent) is added thereto, and the reaction is stirred at 310°C for 3h. The mass of sorbic acid is 2.8 times the mass of the mixed powder of tungsten and cesium.
Step three: the reaction product prepared in step two is separated by plate and frame filtration separation method, and washed with deionized water or ethanol, then dried, and then pulverized by a jet mill to obtain cesium tungsten bronze nanoparticles.
