1993 Volume 19 Issue 6 Pages 1031-1037
The dependence of the ζ-potential of PSL particles in alcohol-water solutions on the dielectric permittivity and electrolyte concentration was investigated. The following features were clarified. 1) When no electrolytes are dosed, the ζ-potential of PSL particles in alcohol-water solutions does not depend on the dielectric permittivity : it is ind pendent of the kind and concentration of alcohols. 2) In the case of solutions of a monovalent electrolyte and a divalent electrolyte with a high dielectric permittivity, the variation of ζ-potential with dielectric permittivity and electrolyte concentration may be explained by the theory of electrical double layer. 3) In the case of solutions of a trivalent electrolyte with a low dielectric permittivity, the variation of ζ-potential with electrolyte concentration is caused mainly by the specific adsorption of ions. 4) In the case of solutions of a divalent electrolyte with a low dielectric permittivity and a trivalent electrolyte wite a high permittivity, the ζ-potential varies in an intermediate way between the above extreme cases.
