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Tungsten trioxide may be used as a near-infrared shielding material as it has good optical properties. In other words, WO3 has photochromic effect. The shielding material mainly refers to the material that has a certain shielding performance to the ultraviolet ray and the near infrared ray. And the application scope of WO3 will be expanded gradually as people need to reduce energy consumption and improve human body comfort. There are many methods for preparing tungsten trioxide, including gas-liquid reaction method,…

Tungsten trioxide may be applied for manufacturing heat insulating window glass with high light transmittance and good shielding performance to UV and near-infrared light. And it may be prepared by gas-liquid reaction method. The gas-liquid reaction method refers to a method in which gas is introduced into salt solution to obtain precursor precipitate, and the precipitate is dried to form ultrafine powder. The method has good safety performance, and the obtained tungsten trioxide powder has small grain size and good…

Tungsten trioxide is a type of photochromic material that may be applied for producing window heat insulation film with high heat insulation and high transmittance of visible light, thereby reducing energy consumption (saving energy charge) and improving human comfort by shielding most of the near-infrared and ultraviolet rays. The heat insulation film may be applied in office, exhibition hall, clothing store, home, factory, and so on. The study of photochromism has become one of the research hotspots in materials science.…

Tungsten trioxide may be applied for the manufacture of thermal insulating glass. Therefore, an in-depth study of the preparation and properties of this photochromic material is required. In 1980, the HxWO3-y film was first prepared by vacuum evaporation by changing the degree of vacuum. And then it was sputtered under three different reaction atmospheres, including Ar-O2 (preparation of pure substoichiometric film), Ar-O2-H2 and Ar-O2-H2O (changing the hydrogen and oxygen composition of WO3). The effect of H+ in the colouration and…

Tungsten trioxide may be applied for the production of heat insulation coating. So, it can be used for manufacturing various kinds of heat-insulating films with excellent weather resistance and long working life. And thus it has a great application prospect in building energy efficiency for energy saving, such as auto film, window film, and so on. Small Polaron Model of Tungsten Trioxide The small polaron model assumes that the spectral absorption is due to polaron transitions between two tungsten atoms…

Tungsten trioxide may be applied for manufacturing thermal insulation coating. And the widely accepted mechanism of discoloration of WO3 is the dual charge injection/extraction model (inter-band transition of electrons) proposed in 1975. The dual charge injection/extraction model was first discovered and proposed in the electrochromic study of WO3 and was later widely used to explain the photochromic performance of WO3. When tungsten trioxide is irradiated by ultraviolet light, electrons in the valence band are excited into the conduction band, leaving…

Tungsten trioxide is a photochromic material that may be applied for producing thermal insulation film. And therefore it may be widely applied to manufacture a variety of heat-insulating glass window, heat-insulating glass door, and the like. This kind of thermal insulation film has high heat resistance, weather resistance and transmittance of visible light. Since the photochromism of the amorphous tungsten trioxide film was first reported in 1973, the tungsten trioxide photochromic material has received much attention. And extensive research on…

Tungsten trioxide, WO3, may be applied for thermal insulation paper as it has the characteristics of high temperature resistance, fire resistance, high thermal insulation, corrosion resistance and long service life. As different preparation methods will have a certain impact on the prepared WO3, research on the preparation method of WO3 has certain guiding significance for the preparation of paper with thermal insulation properties. In the 1980s, some methods were used to prepare tungsten trioxide, such as electron beam evaporation deposition…

Tungsten trioxide nanopowder has photochromic properties, so it can be used as a near infrared shielding material, and thus applied to produce a variety of insulation films, such as auto films and window films of building. Furthermore, people who stay in these spaces will feel more comfortable. In addition, it also saves energy consumption and helps protect environment. The rapid development of photochromism was after the 1990s, which was attributed to the development of laser technology. A laser is a…

There are many types of near infrared shielding material, among which nano tungsten trioxide is unique. Tungsten trioxide is a kind of metal oxide. And as a heat-insulating material, WO3 has become one of the research hotspots in the field of science. It is attributed to the advantages that metal oxides (including WO3) have, such as, easy availability of raw materials, various preparation methods, and simple processes, etc. In 1978, Professor H.G. Heller, a well-known British chemist and pioneer of…