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Dispersion Behavior of Nano TiO_2 and SiO_2-Ag Particles in Aqueous Solution

Zhu Su-kang

Abstract

The effects of dispersant on dispersion of nano TiO2 and SiO2-Ag particles are investigated respectively.The sedimentation height and the size distribution of the dispersed particles in aqueous solution are employed to characterize the particle dispersion.The experimental results show that sodium hexametaphosphate is efficient dispersant for TiO2 and SiO2-Ag particles in aqueous solution.The zeta potential of the particles in aqueous solution is measured to analyze the dispersion mechanism since sodium hexametaphosphate can significantly increase the absolute value of zeta potential of particles.Thus satisfactory and stable dispersion of TiO2 and SiO2-Ag in aqueous solution is obtained.

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