Yellow tungsten oxide nanoparticles may be applied to produce heat insulation coating for applying to glass curtain wall. And the tungsten trioxide nanoparticles raw material can be prepared by chemical precipitation method.
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Experts said that the chemical precipitation method can be used to produce tungsten trioxide nano particles with a particle size of about 100nm. And the tungsten trioxide nano particles can effectively be reduced in a mixed atmosphere of 300-600°C and H2/N2 to produce WO3-x (2≤x≤3) with a stable Magneli phase. Since a large amount of free electrons are generated on the surface of the tungsten oxide, strong absorption of light in the near-infrared band of 1400-1600nm and 1900-2200nm is generated. With the increase of x, the absorption also will be strengthened. In addition, after high-temperature reduction treatment, the tungsten oxide nano particles are formed into rods from the original irregular particles, that is, the microscopic morphology thereof has undergone a large change.
