Nano Cesium Tungsten Bronze Applied for Balcony Thermal Insulating Film

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.

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