Tungsten trioxide applied for preparing windshield heat insulating coating are tungsten trioxide nanoparticles. According the experts, the tungsten trioxide nano particles can be synthesized by acid precipitation method.
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The experts prepared nano particle size tungsten trioxide with average size of 30 nm, and nanoplate with average dimension of 190 ± 15 nm wide and 50 ± 5 nm thick by controlling a precipitation of ammonium tungstate para pentahydrate with nitric acid. The experts obtained the two nanostructured microstructures by varying the stirring time during the precipitation reaction while the other synthesis parameters were identical. The experts also investigated the phase transition of the tungsten trioxide precipitate by means of thermal analysis and X-ray diffraction. At the same time, they observed the microstructure by using a scanning electron microscope (SEM) and a transmission electron microscope (TEM). In addition, they also described the effect of the concentrations of the tungstate salt and nitric acid on the rate of precipitation and the percent yield of the precipitating product.
