Abstract
Dynamic surface tensions of short-chain alcohols at very short adsorption times were measured by using the maximum bubble pressure instrument MPT1 with a modified measuring cell. The experimental data are in very good agreement with results in the literature which were interpreted by a model based on adsorption barriers at short adsorption times and a diffusion-controlled mechanism at longer adsorption times. An approximate solution of a generalized diffusion model is derived which considers the effect of a nonequilibrium surface layer on dynamic surface tensions. This theory suggests that all the studied short-chain alcohols adsorb diffusion-controlled, even at short adsorption times and no adsorption barrier needs to be assumed. The nonequilibrium effects are significant only for surfactant concentrationsc0> 5·10−6mol/cm3and at short adsorption times and can be completely neglected at lower concentrations.
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