Nanometer violet tungsten oxide may be used to produce “transparent” thermal insulation paper, which is applied in building and car for high heat insulation and high visible light transmittance.
Violet tungsten oxide can be prepared by APT light reduction method. In order to determine the optimal process conditions for the production of violet tungsten oxide, some scholars have carried out a large number of experiments. They studied various process parameters affecting the production of violet tungsten oxide, such as furnace temperature, furnace speed, feed amount and NH3 flow. The following image is SEM image of violet tungsten oxide produced by the same APT materials at different furnace temperature, wherein “a” is intermittently evaporated crystalline APT raw material under lower furnace temperature; “b” is under higher furnace temperature.
The experiment proves that, other process conditions remain unchanged, it may cause the WO2 phase content in the violet tungsten oxide to be high if the furnace temperature is too high or the feed amount is too small and the residence time of the material in the furnace is too long; On the contrary, APT is not completely decomposed into W18O49.
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