The reason why tungsten trioxide nanoparticles can be used to obtain transparent heat insulation glass is because WO3 nano particles have special optical absorption properties. Some experts used chemical precipitation method to prepare nano tungsten trioxide powder, and reduced it with hydrogen-nitrogen mixed gas. Then a series of studies were carried out to find that:
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The reduced tungsten trioxide nanoparticles have a significant absorption enhancement effect on near-infrared light in the wavelengths of 1400-1600nm and 1900-2200nm. Also, such nano material has high permeability to visible light. So, nano tungsten trioxide with special optical absorption properties is expected to be applied in the design of new solar thermal shielding devices or new thermal insulation materials.
Among them, the experts analyzed the influence of the reduction treatment temperature on the chemical composition of tungsten trioxide. The crystal phase and chemical composition of the nano tungsten trioxide particles were characterized by X-ray diffractometry. The scanning electron microscope was used to observe the particle before and after the reduction treatment. The morphology of the crystal phase before and after the reduction treatment was observed by scanning electron microscopy. The absorption and transmission spectra of the colloidal liquid prepared from the visible to the near-infrared wavelength range were determined.
