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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…

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…

Nano tungsten trioxide has unique optical properties so that it can be applied to infrared thermal insulation nano material. And the optical properties of WO3 depend on grain size, morphology and special structure of tungsten trioxide nanomaterial to a large extent. Nano WO3, as an n-type semiconductor material, has a broad application prospect in the field of information display devices, highly sensitive optical memory materials and the like. In addition, the research on the photochromic properties of tungsten trioxide is…

Tungsten trioxide powder, a new infrared thermal insulation nano material, has high heat insulation, high light transmittance (visible light), weather resistance and other characteristics due to the photochromic properties of tungsten trioxide. And therefore, it has wide application in the field of heat insulation film. Using oxalic acid as an organic inducer, tungsten trioxide with novel morphology may be synthesized to improve the absorption ability of the powder to exciting light (including ultraviolet and near-infrared rays in sunlight), thereby improving…

Tungsten trioxide may be used as an infrared thermal insulation nano material, which has good characteristics of shielding near-infrared and ultraviolet rays, and good visible light transmittance. Formaldehyde can be used as an organic inducer to synthesize tungsten trioxide powder with novel morphology, which may improve its photochromic properties. Formaldehyde Induced Synthesis of Hexagonal Tungsten Trioxide The formaldehyde induced product is hexagonal tungsten trioxide powder with a particular structure. And the corresponding results show that these tungsten trioxide microspheres consist…

Tungsten trioxide nanopowder is a new infrared ultraviolet shielding material. As its name implies, it is a heat-insulating material that can shield ultraviolet and near-infrared rays. Therefore, studying the photochromic properties of tungsten trioxide helps to understand the thermal insulation material. Tungsten trioxide may be synthesized using 1-propanol as an organic inducer, and the obtained tungsten trioxide has novel morphology, so as to enhance its photochromic properties. 1-propanol Induced Synthesis of Hexagonal Tungsten Trioxide The 1-propanol induced product is hexagonal…

Nano tungsten trioxide is an infrared ultraviolet shielding material (thermal insulation material), which may be prepared by hydrothermal method using sodium tungstate and hydrochloric acid as main raw materials. Preparing tungsten trioxide by hydrothermal method, pH and hydrothermal temperature of the system have greater impact on the structure, morphology and performance of tungsten trioxide: 1. If pH=1.0~1.5, the temperature is at the range of 80~140°C: The product is tungsten trioxide of hexagonal phase, whose particles are spherical of short needle…