Effect of Dispersing and Viscous Agents on Aqueous Dispersion System of Titanium Dioxide

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The object of this paper is to examine the effects of dispersing and viscous agents on aqueous dispersion system of titanium dioxide.<BR>The powder used was Al-modified rutile type titanium dioxide. Dispersing and viscous agents used were sodium metaphosphate and starch syrup, respectively. The particle size distribution was determined by the measurement of change of relative turbidity with sedimentation time under the influential field of centrifugal force. Furthermore, the electrophoretic mobility of suspensions prepared by various dispersing agent concentrations was evaluated with the moving boundary method.<BR>Following results were obtained.<BR>(1) Zeta potential for the suspension of titanium dioxide had negative maximum value of average-1.75 mV at the characteristic concentration of dispersing agent.<BR>(2) Starch syrup as viscous agent did not alter the surrounding situation on surface of titanium dioxide particles, and then it has two effects. One effect is the increase of viscosity of continuous phase, and the other is the decrease of sedimentation velocity of particle in the suspended system.
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