Nano cesium tungsten bronze for balcony thermal insulating film can be prepared by the low temperature hydrothermal reaction. For example, the experts synthesized cesium tungsten bronze (CsxWO3) powder by such a method using sodium tungstate and cesium carbonate as raw materials, with citric acid as the reducing agent.
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The experts investigated the effects of annealing in different atmosphere on the near-infrared shielding properties of CsxWO3. And they characterized the microstructure of CsxWO3 powders by X-ray diffraction. Also, they prepared the CsxWO3 films on glass using polyvinyl alcohol solution as film-forming agent, and investigated the optical transmission properties of CsxWO3 films. Finally, the experts found that the near-infrared shielding ability of cesium tungsten bronze nanopowder after annealed at 200°C in the air atmosphere did not deteriorate apparently, but the 400°C-annealed cesium tungsten bronze nanopowder in the air atmosphere showed apparent decrease of near-infrared shielding properties. Annealing in the carbon powder atmosphere had no apparent effects on the properties of CsxWO3 particles. As for the N2 annealing, the 500°C-annealed cesium tungsten bronze nanopowder showed best improved near-infrared shielding as well as high transparency in the visible light region.
