Dispersion Stability of TiO_2 powder Synthesized by Homogeneous Precipitation Process at Low Temperatures

摘要

Crystalline TiO_2 particles with a diameter of 300nm were obtained from aqueous TiOCl_2 solution with 0.67M Ti~(4+) concentration, diluted by TiCl_4 solution using the homogeneous spontaneous precipitation process. Dispersion stability of rutile TiO_2 powder with acicular typed primary particles has been investigated in both aqueous and organic media. In this paper, we focus on the TiO_2 suspension stability in aqueous and organic media using a recently developed optical analyzer(Turbiscan) and Zeta potential analyzer. The surface potentials of TiO_2 particles were greatly modified by dispersion medium and valance of the ionic species, which governs the colloidal behavior of TiO_2 particles virtually.