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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…

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…

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…

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…

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…

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…

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…