The oil/water interfacial properties of different zwitterionic surfactant (N-dodecyl-N, N-dimethyl-3-ammonio-1-propanesulfonate, ASB; 3-(1-dodecyl-3- imidazolio)propanesulfonate, ImS3; 3-(1-dodecyl-3-benzimidazolio)propanesulfonate, BzImS3) combined with anionic surfactant (sodium dodecyl benzene sulfonate, SDBS) have been studied via experimental and simulation methods. Both experimental and simulation results indicate that the synergistic effect between surfactants is greatly affected by the aromatic cation part of the zwitterionic surfactants. For ASB/SDBS system, the SDBS and ASB molecules are adsorbed at same position of the oil/water interface, which generates competitive adsorption and resulting in a relatively loose surfactant monolayer. For ImS3/SDBS and BzImS3/SDBS systems, the additional π-π stacking interaction increases the compactness of surfactant monolayer, which contributes to the greatly reduced oil/water interfacial tension. The adsorption mechanism of mixed zwitterionic/anionic surfactant systems at oil/water interface is supplemented at a molecular level, which provides a fundamental guidance for an in-depth understanding of optimal selection of surfactant in enhancing oil recovery.

不同两性离子表面活性剂（N-十二烷基-N，N-二甲基-3-氨-1-丙烷磺酸盐，ASB; 3-（1-十二烷基-3-咪唑啉基）丙烷磺酸盐，ImS3; 通过实验和模拟方法研究了与阴离子表面活性剂（十二烷基苯磺酸钠，SDBS）结合使用的3-（1-十二烷基-3-苯并咪唑啉基）丙烷磺酸盐，BzImS3）。实验和模拟结果均表明，两性离子表面活性剂的芳族阳离子部分极大地影响了表面活性剂之间的协同作用。对于ASB / SDBS系统，SDBS和ASB分子被吸附在油/水界面的同一位置，从而产生竞争性吸附并导致相对松散的表面活性剂单层。对于ImS3 / SDBS和BzImS3 / SDBS系统，附加的π-π堆叠相互作用增加了表面活性剂单层的致密性，这大大降低了油/水界面张力。两性离子/阴离子表面活性剂混合体系在油/水界面的吸附机理在分子水平上得到了补充，这为深入了解在提高采油率方面优化选择表面活性剂提供了基础指导。