Tungsten trioxide applied for preparing windshield thermal insulating coating is tungsten trioxide nanopowder. According to the experts, the tungsten trioxide nano powder can be prepared via sol-gel modified Pechini's method using dicarboxylic acid and polyethylene glycol as the chelating agent and polymeric source, respectively.
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Preparation of Tungsten Trioxide by Sol-gel Modified Pechini's Method
Tungsten trioxide powder is first prepared by calcination of resin precursor at 550 °C under various initial concentrations of metal ion (12.5-50 mmol), acid (125-500 mmol), a complexing agent (32-262 mmol), and polyethylene glycol (1-16.5 mmol) in the air atmosphere. The products were characterized using X-ray powder diffraction, field emission scanning electron microscopy, and energy dispersive spectroscopy. The results revealed that the tungsten trioxide nanopowders prepared with different amounts of chelating agent and polyethylene glycol, crystallized in monoclinic phase. The nanopowders were impurity-free due to the presence of the complexing agent and polyethylene glycol as carbon sources. Morphological evolution indicated that the nanopowders evolved from rod-like to regular and spherical shapes, depending on complexing agent and polyethylene glycol amounts. Tungsten trioxide nanopowders with an average particle size of approximately 58 nm and a narrow size distribution were obtained.
