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Surfactant Adsorption Dynamics

Dana T. Grow, J. A. Shaeiwitz
Published 1982 · Chemistry

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Abstract The rates of adsorption of surfactants on solid surfaces were investigated in a packed bed apparatus. Using a nonequilibrium linear isotherm, adsorption and desorption coefficients were obtained by fitting observed peaks from slug input experiments. All adsorption and desorption coefficients were within one order of magnitude of each other, regardless of the charge of the surfactant and packing, and always significantly less than the diffusion limit. Measured surfactant adsorption rate constants were compared to predicted values based on a calculated energy profile between surfactant and surface. Electrostatic repulsion was found to play a minor role in the adsorption rate. Inclusion of an entropy of activation was found to predict the order of magnitude of the rates of adsorption. The resulting analogies with absolute rate theory and collision theory were both successful in describing the order of magnitude of the adsorption rate constants.
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