Nano ammonium metatungstate has been widely used in the production of near-infrared shielding material. And the obtained heat insulation material is applied to architectural smart windows. In this process, ammonium metatungstate is first used to prepare nano tungsten oxide aqueous solution. The prepared tungsten oxide nano aqueous solution has good stability. And the nano tungsten oxide has small particle size. And then the solution is used to prepare heat insulation material.
Therefore, the obtained architectural glass can not only maintain the original high light transmission, but also have excellent thermal insulation and high UV resistance. In addition, the tungsten oxide aqueous solution can also be used in the fields of large-area flat panel displays, gas sensors, dye-sensitized solar cells, automatic rearview mirrors, energy storage devices and the like. The following mainly introduces a preparation method of nano tungsten oxide aqueous solution, and the specific steps are as follows:
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Weigh ammonium metatungstate and sodium borohydride according to the ratio of mass ratio of 1-10:1, and added to deionized water to obtain an aqueous solution of ammonium metatungstate with a concentration of 5-50%. Add sodium borohydride solid into the obtained ammonium metatungstate aqueous solution, mixing and shaking, and allowed to stand at room temperature to 95°C for 10-60 minutes to obtain blue tungsten oxide nano aqueous solution with a particle diameter of 0.1-100nm. The preparation method has the following advantages: the preparation method is simple; it does not require a dispersing agent; it does not need to adjust the pH value; it has short preparation time; it is substantially free of impurities; and it is suitable for large-scale production preparation.
