Cesium Tungsten Bronze Nanopowder Applied for Nano Heat Insulating Film

Cesium tungsten bronze nanopowder has excellent near-infrared shielding and visible light transmission, making it the most suitable nano functional materials for the preparation of nano heat insulating film. While how to prepare cesium tungsten bronze? The expert introduced a preparation method.

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Preparation Method of Cesium Tungsten Bronze Nanopowder for Nano Heat Insulating Film

Step One: Prepare 0.5mol/L tungstic acid solution and 0.2mol/L cesium carbonate solution.

Step Two: Prepare a solution of the reaction precursor. Take 60 ml of the above-prepared 0.5 mol/L tungstic acid solution, put it into a beaker, add 37.8 g of citric acid once in stirring, stir well, then slowly add 15 ml of 0.2 mol/L cesium carbonate solution, then 90 ml of absolute ethanol was added, continuously stirred for 1 hour to obtain the reaction precursor solution. The concentration of tungstic acid in the precursor is 0.18 mol/L, the concentration of citric acid is 1.10 mol/L, and the volume ratio of alcohol to water is 3:2.

Step Three: The above-prepared reaction precursor solution was transferred into three 100 ml autoclaves in three groups, and continuously reacted at 190 °C for 3 d.

Step Four: The precipitate was sequentially washed with water and alcohol for 3 times, and after centrifugation, it was dried under a vacuum of 50 °C for 10 hours to obtain a powder of dark blue crystal phase of hexagonal CsxWO3. Tested by UV-Vis spectrophotometer, CsxWO3 powder has high light absorption performance in the near-infrared region, with the lowest absorbance at the wavelength of visible light of 436 nm, which is 0.7; and the absorbance at the wavelength of 931 nm in the near-infrared region is 1.4.

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