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    A new and consistent model for dynamic adsorption of CTAB at air/water interface

    Year: 2012

    Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects 2012, 406 pp 24-30, 20121211

    Authors: Chi M. Phan,Thu N. Le, Shin-ichi Yusa

    Organizations: Department of Chemical Engineering, Curtin University, Perth, WA 6845, Australia, Department of Materials Science and Chemistry, University of Hyogo, 2167 Shosha, Himeji, Hyogo 671-2280, Japan

    A new and simple equation, with only one parameter, was developed to model the equilibrium surface tension of the air/cetyltrimethylammonium bromide (CTAB) solution interface. The new equilibrium model provides a single best-fitted prediction, instead of several solutions obtained by the conventional Szyszkowski equation. Subsequently, the equation was used to develop anewdynamicmodel, which does not require a Gibbs adsorption isotherm. The diffusion coefficient of CATB was also independently measured by 1H NMR and used as an input for the newdynamicmodel. The newmodel was applied to dynamic surface tension data at 2 different concentrations simultaneously to obtain best-fitted values for adsorption parameters. The modeling result was consistent with all experimental results. In contrast to previous studies in the literature, the newmodel predicts dynamic surface tension of CTAB successfully by a diffusion-controlled mechanism and a kinetics step was not required. The study provides anew and effective dynamicmodel for dynamic surface tension at the air/waterinterface.