Nano needle-shaped violet tungsten oxide may be applied to produce nano tungsten powder and ultrafine tungsten powder by using Rayleigh instability principle and in-situ hydrogen reduction technology. Violet tungsten oxide is also a dingal nano material with many properties such as photochromicproperty, electrochromicproperty and gasochromicproperty, and it may be used in many kinds of sensors in the future.
A Method for Preparing Nano Needle-shaped Violet Tungsten Oxide
Raw materials: ammonium paratungstate (APT), or tungstic acid, or tungsten oxide WOx (2≤x≤3).
Preparation takes place in a tilted, rotating furnace tube. At the feed end of the furnace tube, raw material is pushed into the heated furnace tube by feeding device from the feed port, and gradually moves from the low temperature zone to the high temperature zone under rotation of the tilting furnace tube. The raw material is reduced by H2 in the high temperature zone of the furnace tube to produce nano needle-shaped WO2.72. And gradually nanopowder moves to the discharge end under the rotation of the tilting furnace tube. Then, nano needle-shaped violet tungsten oxide is discharged from the discharge end by discharge device and is cooled by the discharge device to near room temperature. A dedicated outlet is provided on the furnace tube.
More details, please visit:
http://www.tungsten-powder.com/violet-tungsten-oxide.html
