Glass heat insulation coating is a kind of coating prepared by processing one or more nanometer powder materials. The nanometer material itself has special optical properties, that is, it has a high barrier rate in the infrared and ultraviolet regions. , has a high transmittance in the visible region. Utilizing the transparent heat insulation properties of this material, it is mixed with environment-friendly high-performance resin and processed by special processing technology to prepare energy-saving and environment-friendly heat insulation coating. Under the premise of not affecting the lighting of the glass, the effect of energy saving and cooling can be achieved in summer, and the effect of energy saving and heat preservation can be achieved in winter. In recent years, exploring new environmentally friendly insulation materials has always been the goal pursued by researchers. These materials have very broad application prospects in the fields of green building energy saving and automotive glass insulation—nano-powders and functional film materials that have high visible light transmittance and can effectively absorb or reflect near-infrared light. Here we mainly introduce cesium tungsten bronze nanoparticles.
According to relevant records, transparent conductive films such as indium tin oxide (ITOs) and antimony-doped tin oxide (ATOs) films have been applied to transparent heat insulation materials, but they can only block near-infrared light with a wavelength greater than 1500nm. Cesium tungsten bronze (CsxWO3, 0<x<1) has high visible light transmittance and can strongly absorb light with a wavelength greater than 1100nm. That is to say, compared with ATOs and ITOs, cesium tungsten bronze has a blue-shift in its near-infrared absorption peak, so it has received more and more attention.
Cesium tungsten bronze nanoparticles have a high concentration of free carriers and have unique optical properties. They have high transmittance in the visible light region and strong shielding effect in the near-infrared region. That is to say, cesium tungsten bronze materials, such as cesium tungsten bronze transparent thermal insulation coating, can ensure good visible light transmission (without affecting lighting), and can shield most of the heat brought by near-infrared light. The absorption coefficient α of a large number of free carriers in the cesium tungsten bronze system is proportional to the square of the free carrier concentration and the wavelength of the absorbed light, so when the cesium content in CsxWO3 increases, the concentration of free carriers in the system Gradually increasing, the absorption in the near-infrared region is more obvious. In other words, the NIR shielding performance of cesium tungsten bronze increases with its cesium content.
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