Tungsten Oxide

Product
APT 338

APT is the abbreviation for ammonium paratungstate. It may be reduced to tungsten powder (W powder) by hydrogen reducing agent. There are two processes – direct reduction and secondary reduction. 1. Direct Reduction Adopt H2 to directly reduce APT to W powder. Calcination and reduction are generally completed in a furnace tube where is controlled by multiple temperature zones, and the obtained W powder has the characteristics of fine grain size and dark gray color. However, this producing method isn’t…

Product
95% Ultrafine Violet Tungsten Oxide 234

95% ultrafine violet tungsten oxide’s morphology shows some aggregates, which are mainly composed of cluttered columnar or needle-shaped crystals. These aggregates are uneven in thickness, but have an aspect ratio of 20 or above. The morphology of violet tungsten oxide maintains the crystal form like the APT’s. The figure above shows the morphology of single particle of violet tungsten oxide after ultrasonic dispersion. It can be seen from the figure that long needle-like particle in violet tungsten oxide have broken…

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High-purity Ultrafine Grain Size Violet Tungsten Oxide 192

High-purity ultrafine grain size violet tungsten oxide may shield light waves from the near-infrared light. In other words, it may insulate heat intelligently. Also, violet tungsten oxide may be used as drug carrier to treat cancer in the field of biomedicine. Besides, it may be applied in photocatalytic degradation of organic pollutants to clean up environment. Monoclinic violet tungsten oxide has the largest degree of oxygen vacancy. Compared with yellow tungsten oxide and blue tungsten oxide, violet tungsten oxide has…

Product
Ultrafine Grain Size Violet Tungsten Oxide 194

Ultrafine grain size violet tungsten oxide may be prepared by different production processes. At present, violet tungsten oxide (VTO) is generally produced by using ammonium paratungstate (APT) as raw material, and calcining APT with the injection of ammonia gas (NH3) in a rotary furnace. However, the VTO powder prepared by this method has large particle size and high impurity content, that is, it is difficult to obtain VTO powder with higher purity. Research also shows that a method for preparing…

Product
95% Nano Grain Size Violet Tungsten Oxide 190

95% nano grain size violet tungsten oxide has the advantages of large specific surface area, large surface activity, and so on. The nano grain size violet tungsten oxide may be prepared by the following steps: 1. Weigh 0.01mol of ammonium metatungstate ((NH4)6H2W12O41), 0.24mol of ammonium nitrate (NH4NO3) and 0.05mol of thiourea (CN2H4S) in accordance with stoichiometry. 2. Dissolve these raw material powders in an appropriate amount of deionized water and stir until completely dissolved. 3. The above solution was heated…

Product
High-purity Nano Violet Tungsten Oxide 174

High-purity nano violet tungsten oxide may by prepared by the following steps: Step one: Adopt ammonium metatungstate (AMT), ammonium nitrate (NH4NO3) and adjuvant as raw materials. Step two: Prepare these raw materials into solutions according to a certain molar ratio. Mix the solutions evenly. The molar ratio of NH4NO3 to AMT is 12~36. The molar ratio of adjuvant to AMT is 5~15. Step three: The above solutions is heated to be evaporated and condensed to form gelatinoids, and decomposition reaction…

Product
95% Fine Grain Size Violet Tungsten Oxide 197

95% fine grain size violet tungsten oxide may be reduced in hydrogen atmosphere to obtain tungsten powder (W powder). And W powder is carbonized to obtain submicron tungsten carbide powder (WC powder). There are some methods for studying the morphology of VTO, W powder and WC powder: 1. Directly observe the morphology of these types of powder in scanning electron microscope (SEM) to know the overall condition. 2. These kinds of powder are made into samples after being dispersed under…

Product
95% Violet Tungsten Oxide Nanopowder 170

95% violet tungsten oxide nanopowder may be produced by calcining WOx (2≤x≤3) in a closed environment. WOx to Prepare 95% Violet Tungsten Oxide Nanopowder Step one: Feed WOx (2≤x≤3) from the feed end into the heated furnace tube with a feeding device, and gradually move it from low temperature zone to high temperature zone by rotating the inclining furnace tube; Step two: The material continues to move to high temperature zone under the rotation of the inclining furnace tube. When…

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Grade 1 Violet Tungsten Oxide Nanopowder 167

Grade 1 violet tungsten oxide nanopowder adopts tungstic acid (mWO3?nH2O, m≥1, n≥1) as raw material. And the VTO may be produced by calcinating and reducing mWO3?nH2O in a hydrogen reducing atmosphere. Hydrogen Reduction Method to Prepare Nano Needle-shaped Violet Tungsten Oxide Step one: By using feeding device, feed tungstic acid from the feed end into the heated furnace tube, and gradually move it from low temperature zone to high temperature zone under the rotation of inclining furnace tube; Step two:…

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Super Grade Violet Tungsten Oxide Nanopowder 170

Super grade violet tungsten oxide nanopowder may be prepared by calcining ammonium paratungstate with formula of 5(NH4)2O?12WO3?5H2O, APT for short. The steps for calcining APT to prepare super grade violet tungsten oxide nanopowder are as follows: Step one: Feed 5(NH4)2O?12WO3?5H2O from the feed inlet into the heated furnace tube with a feeding device, gradually moving from the low temperature zone to high temperature zone under the rotation of inclined furnace tube. Step two: Calcine 5(NH4)2O?12WO3?5H2O to generate WO3, NH3 and…

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