Tungsten oxide nanoparticles can be said to be a type of transparent thermal insulation nanopowder. That is because the heat insulating materials produced by using tungsten oxide as raw material has high transparency. So, how tungsten oxide raw material can be prepared? What effect does the reaction time have on the prepared tungsten oxide phase?

Tungsten oxide nanoparticles can be prepared by a solvothermal method. Specifically, some experts prepared WO3 nano particles by solvothermal method under the conditions of ethanol as solvent, reaction temperature of 180°C, and reaction time of 1h, 6h. And they studied the influence of reaction time on the morphology of the prepared tungsten oxide. The following figure shows the SEM of tungsten oxide nanoparticles at different times using ethanol as alcohol solvent, wherein, the reaction times of (a) and (b) were 1h and 6h, respectively.

Tungsten oxide nanoparticles can be firstly prepared into an aqueous dispersion, and then be used for preparing a thermal insulation coating, and finally be applied to buildings or automobiles for heat insulation, heat preservation and energy conservation. Wherein, the dispersion is a high-performance heat insulation dispersion which processes the nano particle size tungsten oxide through electronic matching, grinding, homogenization, membrane filtration and other technologies.

Tungsten oxide nanoparticles may be applied for preparing a near-infrared shielding material such as thermal insulation dispersion, thermal insulation masterbatch, thermal insulation film, thermal insulation coating, and heat insulating glass. Therefore, these heat insulating materials may be applied to architectural glass curtain walls or large area glass windows.