(70cy) Zeta Potential of Submicron Particles in Liquid Media

Zeta potential is a parameter that can be used for studying and predicting colloid stability and surface morphology. Even though zeta potential measurements have been applied to both aqueous and non-aqueous suspensions, theories for colloidal behavior and zeta potential in non-aqueous media are not as well-established as those in aqueous environments and there are few reports on systematic studies of zeta potential of colloids in media of various dielectric constants. In the present study, zeta potential and particle size measurements of two carbon black powder samples in various media were performed. Combined with particle size characterization, the experimental zeta potential values were used to discuss the theoretical models for charge transfer and colloid stability.