Nano grain size yellow tungsten oxide may be applied in thermal insulating glass to provide high heat insulation (shielding ultraviolet and near infrared rays) and high light transmittance (visible light). Yellow tungsten oxide can be prepared by sol-gel method.
A Method for Preparing Yellow Tungsten Oxide - Sol-gel Method
A certain amount of sodium tungstate crystal powder was stirred and dissolved in deionized water, and the concentrated HCl was added dropwise to the solution, stirred while being added dropwise to obtain clear and transparent tungstic acid sol; Continue to add a certain amount of concentrated HCl or increase the stirring time to obtain frozen gel; the obtained frozen gel was filtered and washed, and after standing for 7 days, the precipitate was precipitated to the bottom of the beaker, the supernatant was decanted and dried in the blast oven at 60°C; Finally, calcined at 500°C for 2h in the air to obtain light yellow nano tungsten trioxide.
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