Nano WO3 may be used to prepare a transparent thermal insulation paper, that is, a heat insulating film. According to experts, the tungsten trioxide material applied to architectural glass that can play a role of high heat insulation without affecting indoor lighting is a nano-based material with a microporous structure and a large surface area, and therefore it has excellent optical properties – shield UV and near infrared rays, and does not affect the passage of visible light.
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Since the application of transparent heat insulation film of tungsten trioxide nano particles in the field of architectural glass is gradually being promoted, the preparation of tungsten trioxide nanoparticles is becoming more and more important. So, how to prepare tungsten trioxide nanopowder? The tungsten trioxide nanoparticles can be prepared by a sol-gel method. The precursor may be a metal alkoxide or a non-alkoxide. The essence of the preparation method is that the precursor is hydrolyzed into a sol under certain conditions, and then formed into a gel, which is dried and heat-treated to obtain the desired nanoparticles. The sol-gel method can greatly reduce the synthesis temperature and control the particle size to the nanometer level.
