Cesium tungsten oxide powder may be used for the preparation of heat insulation coating. Some experts have found that rod-shaped cesium tungsten oxide nanoparticles can be synthesized by hydrothermal method using sodium tungstate and cesium carbonate as raw materials, and D-malic acid as a reducing agent. And the transparent thermal insulating coating can be prepared on the glass substrate by blending method (mixing with SiO2 sol). The experts also characterized it by X-ray diffraction, scanning electron microscopy and ultraviolet-visible-near-infrared diffuse reflectance spectroscopy to observe the effects of structural characteristics such as crystallinity and micromorphology on the near-infrared absorption properties of the cesium tungsten oxide.
The results show that in the hydrothermal synthesis process, when the Cs/W (molar ratio) of the raw material is 0.5, the formation of hexagonal cesium tungsten oxide nanoparticles can be promoted; the morphology of cesium tungsten oxide nanoparticles is gradually changes from an irregular shape to a rod shape with the increase of reaction time; the near-infrared absorption ability of the obtained cesium tungsten oxide nanoparticles increases as the crystallinity increases, and is greatly increased as the nanorod morphology is formed. The ehat insulating glass prepared by using the nanoparticles maintains a high visible light transmittance of about 72%, and a near-infrared light transmittance of only about 10%, exhibiting excellent near-infrared shielding performance. This also indicates that cesium tungsten oxide nanomaterials have good application prospects in the field of automobile glass and architectural glass.
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