Diffusion-controlled adsorption kinetics of aqueous submicellar and micellar solution at air/solution interface in the limit of short time

摘要

The equilibrium surface tensions γ_(eq) of aqueous Pentaethylenglycol-monododecylether (C_(12)E_5) solutions at temperature 25℃ were measured by means of Wilhelmy plate method and the determined critical micelle concentration (cmc) is 6.8 x10~(-2)mol·m~(-3). To study adsorption kinetics of aqueous submicellar and micellar solutions, the dynamic surface tensions γ(t) were measured by means of maximal bubble pressure method. Using the derived equations of adsorption kinetics for submicellar and micellar solutions, the experimental data were analyzed and the adsorption kinetics was studied. For micellar solution (c_0 > cmc) of C_(12)E_5, the demicellization constant k was calculated.