Interfacial dilational properties of di-substituted alkyl benzene sulfonates at kerosene/water and crude oil/water interfaces

In this research, the interfacial properties of di-substituted alkyl benzene sulfonates at kerosene/water and daqing crude oil/water interfaces have been studied by interfacial tension and interfacial dilational rheological measurements. The experimental results show that the di-substituted alkyl benzene sulfonates can obviously lower the interfacial tensions of kerosene/water and daqing crude oil/water interfaces. The mixed adsorption of active components with sulfonate molecules will reduce or improve interfacial tension at low or high surfactant concentration respectively. Moreover, the adsorption layers formed by di-substituted alkyl benzene sulfonate molecules shows high value of modulus at kerosene/water interface due to the strong interactions among long alkyl chains. However, the mixed adsorption of active components with sulfonate molecules will destroy the tight arrangement of surfactant molecules and result in the obvious decrease of modulus. The possible mechanism has been proposed and ensured by modulus-interfacial pressure curves. (C) 2017 Elsevier B.V. All rights reserved.