INFLUENCE OF MICELLIZATION AND LOW CONCENTRATIONS OF SURFACTANTS ON THE CAPILLARY RISE OF AQUEOUS-SOLUTIONS

The capillary rise of aqueous solutions of various surfactants in glas s capillaries was studied. It is shown that the concentration dependen ce h(C) of capillary rise height h of the solutions of anionic and non ionic surfactants correlates with the isotherm of surface tension sigm a(C). Dependence h(C) for the solutions of cationic surfactants has a plateau at C < CMC. The height of capillary rise of the solutions of c ationic surfactants differs from h of water already at minute values o f C. It is suggested that cationic surfactants are excessively concent rated near the three-phase contact line.