Tungsten Oxide

The invention relates to the use of tungsten oxide or tungstate to increase the heat-input amount of near infrared radiation. It was found that these materials exhibit a distinct higher effect than other known Infrared Radiation(IR) absorbers although absorbing the same amount of energy. This is very surprising and cannot be explained so far. Tungsten bronzes incorporated in coatings led to a much higher temperature increase upon irradiation with IR than expected according to its spectral absorption capacity. The temperature increasing measured was distinctly higher than found with other known IR absorbers and reached almost the temperature observed with carbon black. Many technical processes (like laser welding and marking of plastics, Near Infrared Radiation(NIR) curing and drying of coatings, drying of printings, laser marking of paper, curing and drying of adhesives, fixing of ink toners to a substrate, heating of plastic pre-forms etc.) require an efficient, quick and fo...

Tungsten oxide is one of the mostly studied cathodic coloring electrochromic material. Electrochromic property of WO3 has been made into different electrochromic device and is applied in real life. There are many advantages of electrochromic device, transmittance can change continuously in a wide range and can be adjusted manually. A B.C. engineering lab has created metal-coated glass that transmits up to 10 per cent more light than conventional glass and opens the door to windows that function as electronics. The most immediate use of the technology is to create smart window that can be programmed to absorb or reflect heat, depending on the needs of a building’s occupants, said lead investigator Kenneth Chau, a professor at the University of British Columbia Okanagan. “What’s interesting about this discovery is that it’s counterintuitive, because we always think of metals as being opaque, so it runs against our expectations,” he said. “I think one of the most important implicatio...

Tungsten Oxide Market: Emerging Applications and Drivers Tungsten oxide has several everyday uses. It is used in the manufacture of tungstates for fireproofing fabrics, for x-ray screen phosphors, and in gas sensors. Tungsten trioxide is also used as a pigment in coatings, paints, and ceramics due to its rich yellow color. In addition, tungsten trioxide has also proven useful in the production of smart windows or electro chromic windows. Smart windows are essentially electrically switchable glass that can alter its light transmission properties when a certain voltage is applied. This allows the user to obtain the desired level of tint on their windows by deciding how much light they want passing through. The growth in end user industries is expected to increase consumption of tungsten oxide. The growth in medical and firefighting industry is set to drive the tungsten oxide market. In addition, rising consumption of semi-conducting compounds in emerging economies of Asia Pacific ...

A new material that emits short-wavelength thermal radiation when heated could be used in systems that convert waste heat into electrical energy thus boost waste heat harvesting. Created by an international team co-led by researchers at Purdue University, the University of Alberta and Hamburg University of Technology, the material comprises alternating layers of 20 nm of tungsten oxide and 100 nm of hafnium oxide. Tungsten oxide is a chemical compound containing oxygen and the transition metal tungsten. It is obtained as an intermediate in the recovery of tungsten from its minerals. Tungsten ores are treated with alkalis to produce WO3. It is insoluble in H2O and acids, but soluble in hot alkalis. It is n type semiconductor material, the special physical and chemical property make it used in various filed and become the important functional material in modern scientific research. The structure was chosen so that the emission of long-wavelength infrared photons fr...

Doping is commonly used to improve visible light responsive of transition metal oxide. A lot of researches show that metal ion like rare earth can promote the photocatalytic property of semiconductor material, however, metal doping may cause thermal stability of catalyst decreasing, it will introduce photo electron and recombination center of valance to lower its photoelectric property. Doping N can greatly improve the visible light absorption rate of semiconductor material. Preparing of nanoporous tungsten oxide  electrode: 1) Treating method for tungsten foil: Firstly cut it into 10mm x 15mm pieces, using waterproof abrasive to polish it, then clean it with acetone, isopropanol, methyl alcohol and deionized water ultrasound cleaning for 15min, blow it with nitrogen gas. 2) Use tungsten foil as anode, Pt foil of 10 x 15mm as counter electrode, put them into electrobath, the distance between two electrodes is 25mm. Then put electrobath in water bath of constant temperature,...

Tungsten oxide has excellent performance in electrochromic, catalysis, gas and other aspects. The composite oxides - tungsten bronze metal oxides generally refer darker colored metallic luster, and usually a metal conductor or metal semiconductor. Currently, cesium tungsten oxide, due to its low resistance and excellent visible light transmittance and near-infrared shielding properties, is widely used in the preparation of the conductive film used in glass septum thermal insulation coating. The traditional preparation method of cesium tungsten oxide uses tungsten, tungsten acid source, Cs/W molar ratio of 1: (2.857~100), at 180~200°C reaction conditions for 1~3 days. The preparation takes a long reaction period, is of low efficiency, which is not conducive to industrial production. A process for preparing cesium tungsten oxide ultrafine powder, comprising the steps of: (1) In accordance with Cs / W molar ratio of 1: (1.5 to 2.8), weigh cesium salt and tungsten salt. A ch...