Abstract Mixed cationic/anionic surfactant systems have showed great potential in various fields. Ionic liquids with extraordinary physical and chemical properties are regarded as novel alternatives to traditional surfactants. In this report, we evaluated the performances of the mixed surfactant systems comprising a cationic surface-active ionic liquid 1-dodecyl-3-methylimidazolium chloride (M12) and an anionic surfactant sodium dodecyl sulfate (SDS) in terms of surface/interfacial tension reduction, emulsifying ability, wettability alteration and core flooding tests. Molecular dynamic simulation was employed to explore the surface/interfacial activity of the mixed surfactant systems. The interfacial tension (IFT) between the mixed surfactant solutions and crude oil could be dramatically decreased to the ultralow level (

中文翻译：

---

阳离子/阴离子混合表面活性剂体系提高采收率的机理研究

摘要 混合阳离子/阴离子表面活性剂体系在各个领域都显示出巨大的潜力。具有非凡物理和化学性质的离子液体被认为是传统表面活性剂的新型替代品。在本报告中，我们评估了由阳离子表面活性离子液体 1-十二烷基-3-甲基咪唑氯化物 (M12) 和阴离子表面活性剂十二烷基硫酸钠 (SDS) 组成的混合表面活性剂体系在降低表面/界面张力方面的性能、乳化能力、润湿性改变和岩心驱油试验。采用分子动力学模拟来探索混合表面活性剂体系的表面/界面活性。混合表面活性剂溶液和原油之间的界面张力（IFT）可以显着降低到超低水平（