Tungsten trioxide may be prepared by the sol-gel method and be applied for ceramic microsphere. The WO3 powder prepared by sol-gel method has the characteristics of small particle size, good uniformity and high purity. And it is easy to be industrialized. However, the disadvantage is that it is difficult to control the transformation of the sol-gel, and easy to form hard agglomeration after drying. Besides, the synthesis cycle is often longer. Preparation of Tungsten Trioxide by Sol-Gel Method Na2WO4 was…

Tungsten trioxide may be applied for the manufacture of nano-ceramic color master. And this type of color master can be applied in coating industry, which combines the best performance of WO3 in one. Furthermore, it is also has the characteristics of safety and environmental protection. WO3 may be prepared by sol-coprecipitation method or chemical precipitation method. Preparation of Tungsten Trioxide By Sol-coprecipitation Method Sol-coprecipitation method is a kind of precipitation method. Tungsten trioxide powder with particle size of 3~9nm may…

Tungsten trioxide may be applied for the production of nano-ceramic dispersion solution, which is a type of nano energy-saving coating with high visible light transmittance and excellent heat insulation effect. In other words, WO3 can be applied in the field of building energy conservation. Tungsten trioxide can be prepared by precipitation method. The precipitation method is mainly divided into coprecipitation method and chemical precipitation method. The precipitation method usually mixes different chemical components in the solution state. The basic principle…

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…