Cesium Tungsten Bronze Applied for Kitchen Thermal Insulating Film

Cesium tungsten bronze has high light absorption properties in the near-infrared region, so it is the best material for preparing kitchen thermal insulating film. And such smart heat insulating material makes the prepared heat insulation film have excellent near-infrared shielding performance. Specifically, the cesium tungsten bronze powder has the lowest absorbance at a wavelength of 449 nm of visible light of 0.73, and has the highest absorbance at a wavelength of 1100 nm in the near-infrared region of 1.46. The cesium tungsten bronze powder with the above parameters is prepared by the following preparation method.

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A Method for Preparing Cesium Tungsten Bronze

Step One: Prepare the reaction precursor solution of cesium tungsten bronze. Take 20ml of 0.5mol/L tungstic acid solution, put it into a beaker, add 12.6g of citric acid in stirring, stir evenly, slowly add 5ml of 0.3mol/L cesium carbonate solution, and then add 30ml of absolute ethanol. Stirring was continued for 1 h to obtain the reaction precursor solution. The concentration of tungstic acid in the precursor is 0.18mol/L, the concentration of citric acid is 1.10mol/L, and the volume ratio of alcohol to water is 3:2.

Step Two: The reaction precursor solution prepared was transferred into an autoclave, and continuously reacted at 190 °C for 3 d.

Step Three: The precipitate was sequentially washed with water and alcohol for 3 times, and after centrifugation, it was dried in a sub-vacuum at 50 °C for 10 h to obtain the blue CsxWO3 powder.

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