Abstract
Two effects of 1-alcohols (up to 30% w/w) on electrokinetic properties of silica in the presence of different concentrations of KCl (1 x 10{sup -3}-1 x 1-{sup -1} mol dm{sup -3}) are described. The isoelectric point shifts toward more basic pH, while the negative {zeta}-potentials decrease with higher concentrations of the alcohol and the electrolyte. The change in the pH{sub iep} is explained in terms of the complexation of protonated surface hydroxyl groups by alcohol molecules. The lower negative {zeta}-potentials are due to an increase in cation activity in mixed solvents and, thus, an enhanced counterion adsorption in the Stern layer. 15 refs., 8 figs., 1 tab.
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