Cesium doped tungsten oxide nanopowder may be applied for preparing thermal insulation dispersion. The obtained dispersion can be used in the production of thermal insulation materials such as thermal insulation films, and therefore be used in architectural glass to provide good thermal insulation performance and energy saving effects. Due to its environmentally friendly property, the nano grain size cesium doped tungsten oxide has been more and more widely used in recent years. Therefore, experts are also studying more environmentally friendly and stable preparation methods of nano cesium doped tungsten oxide powder. They proposed the following preparation method, the specific steps are as follows:
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1.0 The raw material sodium tungstate and cesium sulfate are respectively dissolved in absolute ethanol. And the sodium tungstate solution is configured into tungstic acid solution through exchange resin;
2.0 The tungstic acid solution, cesium sulfate solution and the diethylene glycol are mixed and continuously stirred in a water bath at 50-80°C for 1-3h to obtain hydrothermal reaction precursor liquid; the mass of the diethylene glycol is 1.3-3.2 times the mass of the sodium tungstate and cesium sulfate;
3.0 The precursor liquid is placed in a closed hydrothermal reaction kettle with a stirring device, and the reaction is performed at 180-300°C for 5-20h;
4.0 The hydrothermal reaction precipitate is repeatedly washed with absolute ethanol, dried, pulverized, and calcined to obtain cesium doped tungsten oxide nano powder.
