Cesium tungsten bronze can be made into a transparent thermal insulation material. And the thermal insulating material can be thermal insulation films, thermal insulation coatings, and so on. Cesium tungsten bronze can also be compounded with silica to make a composite thermal insulation film. The obtained heat-insulating dingal film is smooth and dense with fewer defects and higher flatness. So, how to prepare cesium tungsten bronze/silica composite film?
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Some experts use ethyl orthosilicate as a raw material, ethanol as a reaction solvent, and dilute hydrochloric acid as a catalyst to prepare silica sol by sol-gel method. Cesium tungsten bronze dispersion was then mixed with silica sol, and the cesium tungsten bronze/silica composite film was gained from spin coating on glass substrate and subsequent sintering. The cesium tungsten bronze/silica composite film was smooth, compact, with less defects and higher flatness. The preparation process of composite coating was that the coating was a two-spin film, the coating thickness was about 4μm, the mass ratio of CsxWO3/SiO2 is 10%. In this way, the visible light transmittance of the film was 68% and the penetration rate of near infrared light was 13%.
