The reason why tungsten trioxide nanopowder can be used as an infrared thermal insulation nano material is that it has photochromic properties. Therefore, the study of the photochromic effect of tungsten trioxide helps to further understand the optical properties of the thermal insulation material.
The infrared thermal insulation material can be applied to many places where need to achieve the target of heat insulation (for energy-saving), such as, window glass of building and automobile, etc. Also, you will feel more comfortable in these places.
Tungsten trioxide powder can be prepared using sodium tungstate (Na2WO4) and hydrochloric acid (HCl) as raw materials by hydrothermal method. The structures and morphology of the obtained tungsten trioxide can be characterized by scanning electron microscope (SEM), transmission electron microscope (TEM) and X-ray powder diffraction (XRD). Furthermore, the photochromic properties of the prepared product can be tested by ultraviolet-visible spectrophotometer (UV-Vis) combined with color difference meter.
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