Nano cesium tungstate powder is a type of near infrared shielding material, which may be prepared by various methods. One of the preparation methods is described below. The cesium tungstate powder prepared by this method has the advantages of small particle size, uniform dispersion, less agglomeration and high purity. Also, it is conducive to industrial production.
Preparation of Nano Cesium Tungstate Powder
Step one: Dissolve ammonium paratungstate (APT) and cesium sulfate in citric acid solution and ethanol solvent, stir evenly, and react at 180-200°C for 2~3h to obtain the mixture of tungsten and cerium. n(CS)/n(W) = 0.33:1.
Step two: Add appropriate amount of urea to the mixture obtained in step one, adjust the pH of the reaction solution to 3~5, and stir until urea is completely dissolved.
Step three: The mixed liquor obtained in step two is washed with argon gas, and subjected to chemical reaction under ultrasound irradiation frequency of 24.45kHz at 70-90°C under argon protection for 2-6h to obtain gel precipitate.
Step four: The precipitate is aged for 4-24h, then filtered, washed, microwave dried, and calcined to obtain nano cesium tungstate powder. The calcination temperature is at the range of 600-700°C and the calcination time is 3~5h.
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