Cesium tungsten bronze powder may be applied for the preparation of near infrared shielding material. Although this kind of heat insulation material has only been discovered in recent years, some experts said that this new material is very promising to replace the ITO and ATO heat insulation materials on the market. As they found that the cesium tungsten bronze film can shield near-infrared light with a wavelength greater than 1100nm, and the near-infrared shielding performance and thermal insulation performance of the glass coated with the cesium tungsten bronze film increase with the increase of the cesium content in CsxWO3.
Therefore, experts are more committed to the preparation of cesium tungsten bronze powder. They found that cesium tungsten bronze with excellent optical properties can be prepared by the following method:
1.0 The 0.5 mol/L sodium tungstate solution is exchanged with a cationic resin to obtain tungstic acid sol;
2.0 Add citric acid solution and cesium carbonate solution to the tungstic acid sol, and then mix to obtain hydrothermal reaction precursor liquid. In the precursor liquid, the concentration ratio of tungstic acid, citric acid and strontium carbonate is 1:0.5:0.1; the concentration of citric acid is controlled to be 0.1mol/L;
3.0 The precursor liquid is placed in a high pressure reaction kettle for hydrothermal reaction. After the reaction is completed, ultrasonic washing, alcohol washing, centrifugation, and spray drying are performed to finally obtain cesium tungsten bronze powder.
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