Cs0.32WO3 for thermal insulation dispersion can be prepared by hydrothermal method using sodium tungstate and cesium carbonate as raw materials and D-malic acid as reducing agent. Wherein, the raw material Cs/W ratio is 0.5, the hydrothermal temperature is 175 °C, and the hydrothermal time is 24, 48, and 72h, respectively.
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The results showed that the prepared Cs0.32WO3 powder for thermal insulation dispersion has a strong absorption capacity at the 1000-2500nm band, and its absorption capacity is significantly enhanced with the extension of the reaction time. In addition, the Cs0.32WO3 obtained after 72h of hydrothermal reaction has strong absorption in the 1314nm band, and its absorbance is close to 1.9, while the absorbance of amorphous Cs0.32WO3 nano powder obtained by 24h of hydrothermal reaction is 1.06, indicating that the formation of rod-like structures greatly improves the near-infrared absorbance of Cs0.32WO3.
