Sedimentation Properties of TiO2 Nanoparticles in Organic Solvents
In this study, the colloidal stability and sedimentation behavior of crystalline TiO2 particles (∼300nm) in various organic solvents have been investigated by means of a backscattered light flux profile (Turbiscan) and a zeta potential measurement. The backscattered light flux profiles revealed that the TiO2 nanoparticles were readily sedimented in water, methyl alcohol, and ethyl alcohol due to a flocculation-induced particle growth, while a particle coalescence and a sedimentation of the TiO2 nanoparticles were hardly observed in isopropyl alcohol. The measured ζ potentials verified the differences of the colloidal stabilities of the TiO2 particles in the organic solvents, showing a good correlation with the migration velocity.
Chang Kyu Rhee
S.H. Woo et al., "Sedimentation Properties of TiO2 Nanoparticles in Organic Solvents", Solid State Phenomena, Vol. 119, pp. 267-270, 2007