Cesium tungstate may be applied for preparing transparent thermal insulation material. And the cesium tungstate powder used must have the characteristics of small particle size, uniform dispersion, less agglomeration and high purity. This requires that the synthesis process of cesium tungstate powder is simple and efficient. The raw material is easy to obtain, and the reproducibility is good, which is beneficial to industrialization. Some experts have prepared the nano cesium tungstate powder which can satisfy the above conditions by using the following process.
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Preparation of Cesium Tungstate Nanopowder
Weigh 1.18g of sodium tungstate and 0.65g of cesium sulfate, add citric acid solution and ethanol reagent at a concentration of 5mol/L, stir evenly, and react at 180°C for 2h to obtain a mixture of tungsten and cesium; Add 1.56g of urea to the mixture, adjust the pH of the reaction solution to 3, stir until the urea is completely dissolved, and form a transparent solution; Stir the above solution evenly, wash it with argon for 10 minutes, then insert the ultrasonic probe at 70°C under argon protection, irradiated with ultrasonic wave at a frequency of 24.45kHz for 2h to obtain colloidal precipitate; The colloidal precipitate was aged for 4h, filtered under reduced pressure, and washed twice with distilled water, and then washed with a volume fraction of 10% ethanol until the solution filtrate was neutral, and finally washed twice with absolute ethanol; The obtained precursor was dried at 80°C for several hours, and then ground into powder. And the powder was placed in a muffle furnace, kept at 700°C for 5h. Cooling with the furnace, the nanometer cesium tungstate powder can be obtained.
