Nano cesium tungstate may be applied for producing infrared thermal insulation nano material. And the obtained thermal insulation material is more and more widely used in building glass window as it is environmentally friendly of high heat insulation and high transparency. So, the preparation method of cesium tungstate is paid much attention to.
While the existing preparation method of cesium tungstate nano powder has the problems of poor dispersibility, poor heat insulation and low visible light transmittance. In this regard, experts have proposed the following preparation method of nano cesium tungstate powder, which can solve the above problems. The specific steps are as follows:
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1.0 According to n(CS)/n(W)=0.33:1, sodium tungstate and cesium carbonate are dissolved in citric acid solution and methanol, stirred uniformly, and reacted at 180-200°C for 2-3 hours to obtain tungsten and cesium mixture;
2.0 Add appropriate amount of urea to the mixture of tungsten and cesium, adjust the pH of the reaction solution to 3-5, stir until the urea is completely dissolved;
3.0 The mixture dissolved in step 2.0 was washed with argon gas, and subjected to ultrasonic irradiation (ultrasonic radiation frequency of 20.81 kHz) at 70-90°C under argon atmosphere for 2-6 hours to obtain gelatinous precipitate;
4.0 The gelatinous precipitate was aged for 4-24 hours, then filtered, washed, dried, and finally calcined to obtain nano cesium tungstate powder.
