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Dispersion Behavior of Ultrafine Titanium Dioxide Particles in Aqueous Solution

Cui Ai-li

Abstract

The effects of dispersant on the dispersion of ultrafine TiO2 particles were investigated. The sedimen- tation height and the size distribution of the dispersed particles in aqueous solution were employed to characterize the particle dispersion. The experimental results show that (NaPO3)6, Na2SiO3 and C2H5OH are efficient dispersants for TiO2 particles in aqueous solution. The zeta potential of the particles in aqueous solution was measured to analyze the dispersion mechanism of different dispersants, since (NaPO3)6 and Na2SiO3 can significantly increase the absolute value of zeta potential of particles, and C2H5OH forms a solvent layer on the particle surface. Thus, satisfactory and stable dispersion of TiO2 particles in aqueous solution is obtained.

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Key concepts: Dispersant, Zeta potential, Dispersion (optics), Aqueous solution, Titanium dioxide, Particle (ecology), Chemical engineering, Materials science