Photocatalytic activity of the tungsten oxide is mainly dependent on the surface area to volume ratio of the material, the surface of the tungsten oxide crystal material under UV irradiation to generate electron - hole pairs, and the dissolved oxygen atom adsorption surface trapped electrons generated anion oxygen, tungsten oxide as a non-toxic catalyst entrainment hole oxidation power, high content is relatively abundant in nature, and therefore is an important catalyst for effective degradation of organic dyes silk processing generated pollution. To enhance the catalytic efficiency, people use various methods to certain specific crystal structure of the tungsten oxide nanocrystals surface exposed, such as the one prepared by anodization having oriented mesoporous like tungsten oxide, titanium oxide modification may well improve WO3 composite catalytic activity.

From the perspective of tungsten understanding of chemical reactions, photochromic effect is reversible redox process tungsten atoms; from the point of view of the electronic band, photochromic process is the UV excitation of the valence band electronic transitions to the conduction band after the formation of electron-hole pairs, photo-generated electrons are trapped into a W6 + W5 +, holes generated or absorbed water is crystal surface oxide film formed after proton H + diffuses into crystals or thin films of tungsten oxide to produce bonded tungsten bronze structure, thus showing a blue. However, this mechanism does not explain the WO3-x (x <0.3) photochromic non reasons.

Based on the above analysis mechanism, people use various methods to optimize the synthesis of photochromic properties of tungsten oxide films, successfully tungsten oxide thin film materials used in smart windows, photonic devices (optical information storage, light regulation) and WO3 / TiO2 composite solar cells and other fields.

Tungsten Powder Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten-powder.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com
Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn

Tungsten oxide nanoparticles is a kind of catalysis, stealth features, electrochromic properties, Gasochromic, photochromic, gas, superconductivity, and many other features versatile semiconductor functional materials. Although so far, related to the electrical properties of tungsten oxide nanoparticles, gas properties and photocatalytic properties have more research, but the optical properties of tungsten oxide nanoparticles and composite semiconductor nanoparticles still fresh.

Prepared by chemical precipitation of nano tungsten oxide powder and mixed with hydrogen and nitrogen gas to restore its processing, analyzing the impact of the reduction treatment temperature on the chemical composition of tungsten oxide, with the X-ray powder diffraction to characterize the crystalline tungsten oxide particles with nanometer and chemical composition, the use of scanning electron microscopy crystal phase morphology of the particles before and after reduction treatment, and measured before and after the nanoparticles by reduction of the resulting gelatinous liquid absorption spectrum from the visible to the near-infrared wavelength range and through spectrum. Studies have shown that: for 1400 ~ 1600nm and 1900 nm to 2200nm band of near-infrared light having a significantly enhanced absorption effect, while a high visible light transmittance, which has a special optical absorption properties of the tungsten oxide nanoparticles after reduction Tungsten oxide is expected to be used in new solar thermal shielding device design.

Tungsten Powder Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten-powder.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com
Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn

Tungsten oxide nanoparticles is a kind of catalysis, stealth features, electrochromic properties, Gasochromic, photochromic, gas, superconductivity, and many other features versatile semiconductor functional materials. Although so far, related to the electrical properties of tungsten oxide nanoparticles, gas properties and photocatalytic properties have more research, but the optical properties of tungsten oxide nanoparticles and composite semiconductor nanoparticles still fresh.

As science and technology and the rapid development of social production, energy saving and environmental protection has become the focus of the world. Ordinary glass of the solar spectrum, through selective is not high, so while visible light, and is located in the near infrared region of the heat will be a substantial way through, causing the indoor temperature rises, the air conditioning and other cooling equipment of the burden bring energy waste, and year by year growth trend. Therefore, exploring new environment-friendly heat shield material is always chasing a moving target researchers, these materials have a high visible light transmittance, and can effectively shield the sunlight in the near-infrared. The main application of transparent thermal insulating material with heat reflective glass and low-E glass, the former to achieve a high near infrared reflectance to achieve their goals, the latter through a highly reflective interior far infrared heat to achieve the insulation effect. However, the preparation of both complex and expensive, heat-reflective glass which also prone to cause "light pollution" and other defects.

Tungsten Powder Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten-powder.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com
Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn

Hydrogen reduction of tungsten oxide, followed by a tungsten carbide is tungsten carbide cemented carbide industry in the preparation of the most common methods, called "conventional hydrogen reduction process." The restore process is crucial, because tungsten carbide powder final size depends largely on reducing the resultant tungsten powder particle size, therefore, tungsten powder fineness and uniformity of tungsten carbide powder manufacturing process becomes a key factor. As reducing conditions in the preparation of ultrafine tungsten powder process, should be kept cold, humidity, push the boat along the hydrogen, is not conducive to WO2 (OH) 2 formation. For tungsten oxide material, although blue tungsten oxide (TBO) is currently taking the most widely used tungsten powder raw material by hydrogen reduction system, but it is a chemistry and physics from Xanadu is difficult to precisely define industrial products. Clearly, the performance of the tungsten oxide starting material affects the performance and behavior of the final reduction of tungsten powder, a low temperature (700 ℃ ~ 800 ℃) performance of the tungsten oxide strongly affects the reduction kinetics process, blue tungsten oxide than the yellow oxide at low temperatures Tungsten has a higher activity.

Tungsten oxide materials can be prepared to take appropriate reducing conditions in the ultrafine tungsten powder; single-phase tungsten oxide obtained after reduction by ultrafine tungsten powder fine and uniform, multiphase tungsten oxide produced by the reduction of fine tungsten powder uneven; In the low temperature, low humidity, high hydrogen flow rate of stable hydrogen reduction under the process conditions, for the tungsten oxide has a phase component, which can be approximately predicted uniformity ultrafine tungsten powder. Thus, in the manufacture of cemented carbide crystallites, characteristics should be considered in-phase component of the tungsten oxide material.

Tungsten Powder Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten-powder.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com
Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn