Dependence of the electrophoretic coefficient of polystyrene model colloids on the solvent composition

Abstract:

An experimental investigation of the electrokinetic transport of negative and positive polystyrene beads in alcohol-water mixtures is described. The electrophoretic phenomenological coefficient has been measured, and a nonlinear dependence on the alcohol concentration has been found. The liquid properties (density, viscosity, and dielectric constant) and the ζ-potential have been shown to play a significant role in the internal structure of the electrophoretic coefficient (l21) for the negative polystyrenel(ethanol or 1-propanol)-water mixture. This behavior is quite different for positive polystyrene. A typical hydrophobic character of the positive polystyrene contrast with the double hydrophobic-hydrophilic character of the negative one.

Año de publicación:

1998

Keywords:

• Polystyrene
• Liquid mixtures
• Electrokinetic coefficients

Fuente:

scopus