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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…

Tungsten trioxide powder may be used as a near infrared shielding material with long working life, which is mainly determined by its photochromic properties. Photochromism refers to the reversible change of a substance between two physical or chemical states, at least, one of which is caused by light radiation. The changing process can be expressed by the following equation: The basic characteristics of changing process of photochromism process is shown as bellow: (1) T1 and T2 can be stable under…

Tungsten trioxide (WO3), which has good photochromic properties, is a near infrared shielding material. And study of the relationship among special structure, morphology and enhancement of photochromic properties can provide a theoretical basis for preparing better thermal insulation materials of WO3 powder. The tungsten trioxide powder can be prepared by hydrothermal method using sodium tungstate and hydrochloric acid as raw materials. By analyzing the influence of different pH values and different reaction temperatures on the structure, morphology and photochromic properties…