Nano yellow tungsten oxide powder may be applied for the manufacture of thermal insulation dispersion liquid so that the dispersion liquid has the advantages of high heat insulation, energy saving, environmental protection, flame retardancy, water resistance, acid resistance, alkali resistance, convenient construction, easy promotion, and long service life, etc. And therefore, this kind of dispersion liquid of high thermal insulation ding is often used under general working condition.
Yellow tungsten oxide is also known as tungsten trioxide. The mesoporous tungsten trioxide may be prepared by sol-gel method. And the product turned dark blue when it was exposed to ultraviolet light for 3 minutes. So, it has been suggested that mesoporous tungsten trioxide has potential applications in optical devices. However, there are relatively few reports on the photochromic properties of tungsten trioxide of different phases. Monoclinic tungsten trioxide nanopowder and orthorhombic tungsten trioxide nanopowder were successfully prepared by chemical precipitation and low-temperature hydrothermal method. Then, the bandgap energy of the synthesized products was measured by UV-visible spectroscopy to study the photochromic properties of tungsten trioxide nanopowder of different phases under ultraviolet illumination.
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