Effect of pentanol on the mean interfacial solvent and electrostatic characteristics of cationic micelles

Abstract

The effect of 1-pentanol on the mean interfacial solvent properties and the mean electrostatic surface potential of a number of cationic dodecyltrimethylammonium halide micelles has been ascertained by utilizing the solvatochromic acid-base indicator ET(30). The effective interfacial dielectric constant of a dodecyltrimethylammonium halide micelle has been found to increase slightly upon the addition of 1-pentanol. The micellar surface potential has been found to decrease with increasing 1-pentanol concentration. The experimental surface potentials have been compared with those obtained by numerically solving the unmodified nonlinearized Poisson-Boltzmann equation. The comparison indicated t..