Nano CsxWO3 powder for thermal insulating glass can be prepared by hydrothermal method using sodium tungstate dihydrate as the tungsten source and cesium sulfate as the cesium source. Some scholars have chosen five concentrations of sodium tungstate dihydrate: 0.9moL/L, 0.7moL/L, 0.5moL/L, 0.3moL/L and 0.1moL/L, and observed the effect of the concentration of different sodium tungstate dihydrate on the optical properties of cesium tungsten bronze transparent aqueous phase nano dispersions.
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It can be seen from the results that the concentration of sodium tungstate dihydrate has a great influence on the optical properties of the nano dispersion of cesium tungsten bronze transparent aqueous phase. When the concentration of sodium tungstate dihydrate is 0.1moL/L, the nano dispersion of cesium tungsten bronze has a maximum visible light transmittance of 65% at 550nm, and the shielding rate of the dispersion in near-infrared light at a wavelength of 1000nm is 89%. As the concentration of sodium tungstate dihydrate increases, the quality of the product also increases. When the concentration of sodium tungstate dihydrate is raised to 0.3mol/L, the obtained cesium tungsten bronze dispersion has a visible light transmittance of 68% at 500nm, and the blocking rate of the dispersion to near-infrared light at a wavelength of 1000nm is up to 92%. When the concentration of sodium tungstate dihydrate was increased to 0.9mol/L, although the yield was greatly increased, the dispersion had the highest visible light transmittance at 600nm, which was 59%. This is because the concentration of the raw material is too high and the mixing is uneven. At this time, the shielding rate of the dispersion to near-infrared light at a wavelength of 1000nm is 87%. With the increase of sodium tungstate dihydrate concentration, the optical properties of the product increased first and then decreased. At 0.1moL/L, the obtained cesium tungsten bronze nano aqueous phase dispersion exhibited the best optical properties.
