The Amount of Acetone Affects Tungsten Trioxide Reaction System

The nature of the reaction system of tungsten trioxide, will continue to change as the amount of acetone added. The addition of acetone will change the solubility of sodium tungstate solution, the system of saturated vapor pressure and viscosity properties. These factors affect the process of nucleation, growth and mass transfer of tungsten trioxide, respectively. Acidified sodium tungstate can be dissolved in a mixed solvent of water and acetone, but can not be dissolved in acetone.

The morphology of tungsten trioxide obtained when the solvent is acetone is inhomogeneous due to the uneven nucleation of tungsten trioxide. Due to the presence of tungstate anions have important effects on the synthesis of different types of tungsten trioxide. Therefore, the solubility of sodium tungstate is directly related to the solubility of tungstate, thus affecting its presence in solution. This is why special tungsten trioxide is obtained when acetone is the solvent.

In the mixed solvent conditions, due to the solubility of tungstate is very good, so get a special hydrated tungsten trioxide. Crystal growth depends on the interaction of the crystal surface with the solvent. In low polarity solvents, this effect is weaker, resulting in slower growth of the anisotropy of tungsten oxide crystals. Therefore, under the conditions of the lower polarity of the mixed solvent tungsten trioxide obtained from the construction unit is subject to hexagonal film. In the more polar water system, the resulting sample unit for the long strip.

In addition, the structure of tungsten trioxide gradually narrowed as the amount of acetone added. This is because the addition of acetone reduces the viscosity of the sodium tungstate reaction system, thereby increasing the rate of mass transfer reaction. The saturated vapor pressure of the reaction system is an important factor affecting the crystal growth. After the addition of acetone, the saturated vapor pressure of the reaction system increased, and the number of hexagonal tablets increased. This is because the higher saturated vapor pressure reduces the chances of collisions of the nuclei of tungsten trioxide, thereby making it easier to obtain hexagonal sheets of tungsten trioxide than the flower-like graded structure.

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