Add time:09/27/2019         Source:sciencedirect.com

The dynamic adsorption of cetyl trimethyl ammonium bromide (CTAB) was investigated at decane/water interface by pendant drop technique. The images were analysed using Axisymmetric Drop Shape Analysis software and then were modelled using a new model. The model provided a unique solution for equilibrium adsorption. Consequently, dynamic data at two different concentrations were fitted simultaneously to determine the adsorption parameters. Good fittings have been achieved and then applied to predict dynamic tension at other concentrations. The outcomes revealed a significant increment in term of interfacial adsorption in comparison with adsorption at the air/water interface. The nature of this increment can be explained by considering the impacts of hydrophobic oil molecules and interfacial layer arrangements of alkane/water interfaces. The results can be used to quantify the interaction between alkane and the hydrocarbon tail of ionic surfactants at the oil/water interface.

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