Tungsten Oxide

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Hexagonal Tungsten Trioxide Nanowire 613

Hexagonal tungsten trioxide nanowire may be synthesized by hydrothermal method using Na2WO4?2H2O and HCl as raw materials, K2C2O4 and K2SO4 as structure-directing agents respectively. The hydrothermal reaction was conducted at 150°C for 12h. The structure of hexagonal WO3 nanowire obtained presents complex net structure with higher specific surface area, which improves the photocatalytic activity of the material. The presence of two additives, K2C2O4 and K2SO4, proved that K+ plays an important role in guiding the growth of WO3 nanowire. The…

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Tungsten Oxide Nanowire 553

Tungsten oxide nanowire may be prepared by hydrothermal method using Na2WO4?2H2O and HCl as raw materials with Na2SO4 as additive． Hydrothermal Method to Prepare Tungsten Trioxide Nanowire 1. Weigh 3.68g (0.011mol) Na2WO4?2H2O into 20ml deionized water and stir it to dissolve; 2. Add 3M HCl to the above solution dropwise, stir it until the white precipitate no longer generated, and adjust the pH≈1; 3. Add in certain amount of 0.5M Na2SO4, continue to stir for 2h and transfer the solution…

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Tungsten Oxide Nanotube 580

Tungsten oxide nanotube requires extra coating and etching processes if it is prepared by traditional producing methods, whose quality greatly depends on the control of processing steps. Therefore, the hollow WO3 nanofibers may be directly manufactured by using the coaxial electrospinning technology to simplify the process. Principle of Coaxial Electrospinning Technology The hollow nanotube is generally obtained by coaxially electrospinning readily soluble or volatile substance and then removing the core layer by dissolving or heating. In general, mineral oil and…

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99% Sodium Tungstate 379

99% sodium tungstate’s impurities may be determined using lanthanum hydroxide as coprecipitation agent by inductively coupled plasma atomic emission spectrometry (ICP-AES method) after coprecipitation separation and concentration of these impurities. These trace metal impurities are calcium, tin, cobalt, copper, iron, manganese, zinc, and nickel, etc. The determination of trace metal impurities must be performed on a high resolution spectrometer if the ICP-AES method is adopted directly. That is because the matrix tungsten often has severe spectral overlap interference with the…

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Fe-doped Tungstic Acid 617

Fe-doped tungstic acid may be prepared using sodium tungstate and iron salts as materials. Since Fe initiates the Fenton reaction, the photocatalytic activity of tungstic acid is greatly improved. Also, this is a heterogeneous reaction that avoids the loss of iron ions and thus enables the reuse of the catalyst. Tungsten compounds have a wide range of applications in the field of photocatalysis. These compounds can undergo intramolecular charge transfer under the irradiation of ultraviolet light, thereby triggering the degradation…

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Industrial Grade Tungstic Acid 603

Industrial grade tungstic acid is an intermediate compound of ammonium paratungstate (APT) in powder metallurgy. Preparation of Industrial Grade Tungstic Acid Step 1: Add tungstic acid raw material with a purity of 99.95% into the inorganic acid solution, the mass ratio of the inorganic acid solution to the tungstic acid raw material is 1:1 to 2:1, ultrasonic irradiation oscillation for 3h-6h. The temperature is controlled at the range of 20°C~40°C, suction filtration to obtain filter cake solid; Step 2: Put…

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High-purity Tungstic Acid 577

High-purity tungstic acid is a new chemical material with a wide range of application prospects, which may be prepared by a new process of dissociation – slurrying – acid decomposition, with purity higher than 99.99% and average particle size of 0.61μm. The process is stable and easy to operate with high transformation rate. Tungstic acid may be produced by acid decomposition scheelite concentrate method, ammonium paratungstate method, artificial scheelite method, ammonium paratungstate sodium method, and the method of acid decomposition…

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Nano Grain Size Tungstic Acid 598

Nano grain size tungstic acid may be synthesized by chemical precipitation method using ammonium metatungstate (AMT) and hydrochloric acid (HCL) as raw materials, and the agglomeration of nanoparticles may be effectively improved with the addition of ethanol. And nano tungstic acid with high purity, small particle size and good dispersion may be prepared by liquid phase precipitation method in the alcohol-water system. Synthesis of Monodisperse Tungstic Acid Nanoparticles by UV Irradiation Monodisperse tungstic acid nanoparticles with an average particle size…

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Tungsten Bronze 308

Tungsten bronze is a type of non-stoichiometric compound with formula of MxWO3, where M is usually alkali metal, alkaline earth metal, ammonium ion and rare earth metal ion, etc; and 0< x< 1. The change in the types of M and the value of x make MxWO3 having conductor or semiconductor properties. Tungsten Bronze Properties 1. Usually cubic crystal or tetragonal crystal. 2. Color varies with the change of x value, from golden yellow to light blue gray. 3. All…

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Potassium Cesium Tungsten Bronze 605

Potassium cesium tungsten bronze has formula of KxCSyWOz, where x+y≤1 and 2≤z≤3. If the particles of KxCSyWOz are nano particles. The particles are useful as near-infrared (OTR) absorbers and/or heat shielding additive (may be prepared by a plasma torch). And the additive may be applied in organic or inorganic substrates, such as plastics, paints, enamels, inks, adhesives, ceramic or glass. The potassium cesium tungsten bronze particles exhibit properties of a solid solution. I.e., they are uniform and present in a…

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