Prediction of oil/water interfacial tension containing ionic surfactants

This study introduces a new approach to predict interfacial tension (IFT) at oil/water interfaces in the presence of ionic surfactants. Experimental data for sodium dodecylsulphate (SDS), decyltrimethylammonium bromide (C10TAB) and dodecyltrimethylammonium bromide (C12TAB) at hydrocarbon/water interfaces are used to validate the new approach. The model parameters, including molar surface area (ω) and bulk-surface distribution coefficient of surfactant (KS) are obtained by fitting the proposed equation to the literature data. The change of model parameters at different interfaces is discussed. In all cases investigated, the deviation of results for the suggested equations is less than previous work. A good agreement between results and experimental data is obtained in the concentration region below and near the critical micelle concentration.Graphical abstract
Source: Colloids and Interface Science Communications - Category: Nanotechnology Source Type: research