Ammonium metatungstate powder can be used to prepare cesium tungsten bronze nanopowder, and the obtained dingal nanoparticles can be used for producing window heat insulation film. Finally, the transparent film is applied to architectural glass to obtain heat insulation architectural glass. Among them, the experts introduced a preparation method of cesium tungsten bronze nanopowder, including the following steps:
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Step one: dissolve the reaction amount of ammonium metatungstate and cesium carbonate in a solvent methanol, dry the above solution to obtain a powder, and further pulverize the obtained powder to obtain the mixed powder of tungsten and cesium. Among them, the pulverization may be carried out by a conventional pulverization method such as ball milling or jet pulverization method; drying is also carried out by a conventional drying method such as oven drying, spray drying, freeze drying or boiling drying.
Step two: place the mixed powder of tungsten and cesium in a closed reaction vessel with stirring. The sorbitol is added as a reaction solvent thereto. And the reaction is stirred at 300°C for 6h. The mass of the reaction solvent is twice the mass of the mixed powder of tungsten and cesium.
Step three: separate the reaction product in step two by centrifugation separation method, and wash with deionized water or ethanol, followed by drying, and then pulverized by a jet mill to obtain the cesium tungsten bronze nano powder.
