Tungsten Oxide

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 bronze, 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. Preparing method of  cesium tungsten oxide ultra fine 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 che

Brown University researchers have developed a new tungsten oxide four-in-one catalyst that can perform four separate chemical reactions in sequential order and in one container to produce compounds useful in making a wide range of pharmaceutical products. "It normally takes multiple catalysts to carry out all of the steps of this reaction," said Chao Yu, a post-doctoral researcher at Brown who co-led the work with graduate student Xuefeng Guo. "But we found a single nanocatalyst that can perform this multistep reaction by itself." The research, described in the Journal of the American Chemical Society, was a collaboration between the labs of Brown professors Christopher Seto and Shouheng Sun, who are coauthors of the paper. The work was done, the researchers said, with an eye toward finding ways of making the chemical industry more environmentally sustainable. Multi-reaction catalysts like this one are a step toward that goal. "If you're r

A European Food Safety Agency (Efsa) science panel has concluded that the use of tungsten oxide as a reheat agent in PET plastic food contact material (FCM plastics) is safe for consumers. The question of safety was put to Efsa in 2014 by the Colormatrix Group through the UK competent authority, the Food Standards Authority. The agency asked its Food Contact Materials, Enzymes, Flavourings and Processing Aids (CEF) Panel to review it. The panel's dossier included studies on the identity of the substance, its migration into food simulants and potential toxicity in line with the EU food contact materials regulations. Tungsten oxide is a mixture of oxides used as a reheat agent to increase the infrared heat absorption of plastics from heat lamps during blow-moulding processes. It has the advantage of having a minimal effect on the transparency of the packaging, when used at the proposed maximum use level of 75ppm. The detailed reasoning behind the CEF panel's app

Electrochromic glass windows on the market are able to change color tints when an electric voltage is applied, but don't offer very many color options. But according to New Atlas writer Darren Quick, that's about to change. Now researchers at the Fraunhofer Institute for Applied Polymer Research (IAP), working with Tilse Formglas GmbH have turned to a different technology that speeds up the switching process considerably and provides different color shades to tinted windows. Here's how the whole thing works: Most electrochromic glass windows on the market are produced by coating two panes of glass in a thin film of translucent indium tin oxide or fluorine-doped tin oxide to make the glass electrically conductive. Then one of the panes is coated in electrochromic tungsten oxide and the two panes are brought together with the coatings facing each other and a gel-like electrolyte separating them. When a voltage is applied, the tungsten oxide coating darkens, and when

Most consumers think luxuries and fast fashion are totally different concept. Designer clothes are expensive so we think it is totally in accordance with eco-friendly fashion. Not really. Just like carbon emission rate is the same in first class and economic class, fast fashion has been doing harm to environment. Today, both luxury brands and minority brands attach great importance to environment, and hae taken measures to produce eco-friendly products. For example, New York designer Maria Cornejo uses special white fiber from regeneration wood paper pulp. Cornejo called the new manmade fiber as Eco Drape. She said:’ Made eco-friendly fashion is a long way to go. Manmade fiber is the mostly favored material. By transforming it into eco-friendly material can greatly protect environment. It is free from illegal cutting trees and prohibited chemicals. What makes it more valuable is the incompatible weight and dropping style. Eco-friendly principle is also pursued by Stella Mc

A varistor is an electronic component with an electrical resistance that varies with the applied voltage. Also known as a voltage-dependent resistor (VDR), it has a nonlinear, non-ohmic current–voltage characteristic that is similar to that of a diode. In contrast to a diode however, it has the same characteristic for both directions of traversing current. At low voltage it has a high electrical resistance which decreases as the voltage is raised. Varistors are used as control or compensation elements in circuits either to provide optimal operating conditions or to protect against excessive transient voltages. When used as protection devices, they shunt the current created by the excessive voltage away from sensitive components when triggered. In recent years, studies on low-voltage varistor materials have gotten widespread attention, such as TiO2, Sr TiO3 and WO3. In 1994, WO3 ceramics nonlinear behavior was first reported. The study shows that tungsten oxide ceramic mat

Functional ceramics have many excellent properties in electricity, magnetism, sound, light, heat, etc. that make it difficult for other material to match, and some have more than one function. And these properties usually depends on the internal electronic state or structure of the atomic nucleus. It’s also known as electronic ceramics. It has been widely used in energy development, electronic technology, sensor technology, laser technology, photonics technology, infrared technology, biotechnology, environmental science and other aspects. In addition, the semiconductor ceramic, the insulating ceramic, the dielectric ceramic, luminescent ceramics, photosensitive ceramic, absorbing ceramics, ceramic laser, a ceramic nuclear fuel, propellants ceramics, ceramic converting solar light into energy storage and ceramics, ceramics solid battery, ceramic damping biotechnology ceramics, catalysis ceramics, film and other special functions, which also play important roles in automatic control, in

TiO2 photocatalyst due to its excellent photocatalytic performance which has the advantages of light corrosion and chemical corrosion, non-toxic and of low cost has become a topic for many scholars. Titanium dioxide powder is frequently studied at present, however, powder photocatalyst used in water treatment usually require power to maintain the suspension. It was stirred with another catalyst separation and recovery of difficult practical application is limited. Anodic oxidation method for the manufacture of titanium substrate surface titania nanotube array films not only solve the problem of catalyst separation and recovery, and its special tubular structure can provide access to electronic transmission, reducing the composite photo-generated electrons and holes to a certain extent, help improve the efficiency of photocatalytic reaction. A method for the preparation of the tungsten oxide modified titanium dioxide nanotube comprising the steps of: (1)Wash the titanium sh