Investigate of Synergistic Effects Mechanism of Mixed Surfactants at the Oil/Water Interface

Abstract

Abstract:

The method of dissipative particle dynamics was adopted to simulate the interfacial orientation of mixed systems between coconut diethanol amide(6501) and dodecyl alpha olefin sulfonate(DAOS),cocoanut amide propyl betaine(CAB), sodium dodecyl benzene sulfonate(SDBS) respectively at the oil/water interface. The effect of salt and molecular structure on the interfacial activity of pure and mixed surfactant systems were investigated. The mechanism of synergistic effects of mixed surfactants is analyzed from the aspects of interfacial efficiency, interfacial density, the array shape of molecules and so on. It was observed that nonionic surfactants have high absorption tendency but low interfacial efficiency, while ionic surfactants have high interfacial efficiency which can be increased with the increase of salinity but low absorption tendency. In the case that ionic or zwitterionic surfactants with higher interface adsorption tendency coexisting with nonionic surfactants, the cavities at the interface layer formed by ionic or zwitterionic surfactants are filled with nonionic surfactant clusters, synergistic effects could be introduced and interface tension could be decreased to ultra low value at low surfactant concentration because of high interfacial efficiency coursed by high interfacial density and high interfacial effectiveness of the mixed surfactants.

Key words: Dissipative particle dynamics, Interfacial density, Interfacial efficiency, Ultra low interfacial tension, Synergistic effect

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TAN Jing, CAO Xu-Long, LI Ying*, SONG Xin-Wang, HE Xiu-Juan, CUI Xiao-Hong. Investigate of Synergistic Effects Mechanism of Mixed Surfactants at the Oil/Water Interface[J]. Chem. J. Chinese Universities, 2009, 30(5): 949.

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Investigate of Synergistic Effects Mechanism of Mixed Surfactants at the Oil/Water Interface

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