Tungsten Oxide

 Tungsten oxide is a very classic low-dimensional transition metal oxide material, which is attracted by its special physical and chemical properties (such as electrochromism, photochromism, catalytic activity, superconductivity and large load capacity, etc.) A large number of materials, semiconductor devices, and physics and chemistry researchers are paying attention. However, there is no report on white tungsten oxide and its preparation method. The chemical formula of white tungsten oxide is the same as that of purple tungsten oxide, which is W18O49. It can be excited to become blue under the irradiation of ultraviolet light, and it can be restored to white after removing the ultraviolet light. It is widely used in construction, automobiles and other fields. A method of producing white W18O49, there are the following steps: Disperse the tungsten hexachloride ultrasonically in anhydrous n-butanol, of which 150ml anhydrous n-butanol is used per gram of tungsten hexachloride. When...

Tungsten carbide-based cemented carbide is widely used in cemented carbide, and high-quality tungsten carbide powder is the basis for preparing high-performance cemented carbide. What is the preparation method of high crystallinity tungsten carbide powder ? A preparation method of tungsten carbide powder with high carbonization crystal integrity and fast carbonization rate includes the following steps: 1) After mixing tungsten powder and carbon black, press the compact into a compact by a press; 2) Carburize the compact in step (1), after the carbonization is completed, ball milling and sieving can obtain high crystallinity tungsten carbide powder. Precautions for this preparation method: 1. In step (1), the F.S.S.S. particle size of the tungsten powder is 3-40μm, and the particle size of the tungsten powder is too fine and it is not easy to form during pressing. The pressing pressure of the press is 1.0-2.0mpa. The mixing is ball mill mixing, and the mixing time is 1~6h. 2. In step (2...

Ammonium paratungstate (APT) preparation is an important part of smelting tungsten, whether it is using chemical precipitation method, ion exchange method or extraction method, it all have to go through the process of ammonium trioxide to produce qualified APT. APT is an important tungsten intermediate product, the higher the purity the greater the value, so APT preparation process is also the further purification of tungsten. Commonly used method for preparing ammonium paratungstate is evaporation crystallization method, neutralization crystallization method and frozen crystallization method. Evaporation crystallization method is heating evaporation solvent, so that the solution from unsaturated to saturated, continue to evaporate, the excess solute will be crystal precipitation, called evaporation crystallization method. This method of technology and equipment is simple, easy to large-scale, this method technology and equipment is simple, easy to large-scale, at the s...

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...

Nano semiconductor material used as photocatalyst to photolysis water has gained well efficiency. TiO 2  has high catalytic activity and stability is widely used as a kind of photocatalytic material. But its band gap is big (~3.2 eV), it can only be motivated by ultraviolet with short wave length, its light transaction efficiency is low (~4%). Tungsten oxide is an indirect band series transition semiconductor material. Compared to TiO 2 , it has narrow band gap (2.5~3.0 eV), the relevant absorbing wave length is 410~500nm and well photoelectric responsive property in visible light area. Tungsten oxide thin film electrode preparation method: Raw material: FTO glass; tungstic acid; hydrogen peroxide; acetone. (1) Be ready with clean FTO glass as the substrate of depositing WO 3 . Cut FTO glass into 1.2cm*2.5cm pieces and clean it by ultrasound and ultraviolet. The clean and flatness of FTO substrate has big effect on adhesive force and uniformity of thin film electrode...

Nano semiconductor material used as photocatalyst to photolysis water has gained well efficiency. TiO 2  has high catalytic activity and stability is widely used as a kind of photocatalytic material. But its band gap is big (~3.2 eV), it can only be motivated by ultraviolet with short wave length, its light transaction efficiency is low (~4%). Tungsten oxide is an indirect band series transition semiconductor material. Compared to TiO 2 , it has narrow band gap (2.5~3.0 eV), the relevant absorbing wave length is 410~500nm and well photoelectric responsive property in visible light area. Tungsten oxide thin film electrode preparation method: Raw material: FTO glass; tungstic acid; hydrogen peroxide; acetone. (1) Be ready with clean FTO glass as the substrate of depositing WO 3 . Cut FTO glass into 1.2cm*2.5cm pieces and clean it by ultrasound and ultraviolet. The clean and flatness of FTO substrate has big effect on adhesive force and uniformity of thin film electrode. So be...