Abstract
The dynamic surface tension of aqueous solutions of alkyl dimethyl phosphine oxides with different alkyl chain length is studied. The experimental results obtained for the lower homologues (C 8–C 12) were found to correspond rather satisfactorily with the values predicted by the classical diffusion model. For the higher homologues (C 13–C 15), however, the measured dynamic surface tensions are higher than the theoretically predicted ones. Fitting would lead to a theoretical diffusion coefficient for, say, C 14DMPO, which was 3 to 4 times larger than the physical values. A diffusion-controlled adsorption kinetics theory is proposed which considers two states of C n DMPO at the surface, each with its characteristic different partial molar area value. This theory agrees with the experimental data with typical diffusion coefficients.
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