二元复合驱表面活性剂在油水界面的作用机理

用介观模拟方法对二元复合驱用表面活性剂分子在油水界面的分布形态进行了研究。发现十二烷基苯磺酸钠（SDBS）和辛基苯基聚氧乙烯醚（TX100）均分布在油水的界面，单独使用时对界面张力的降低均有一个极值，但两者协同作用时呈互补的状态，使油水界面处表面活性剂分子的分布密度增大，更多地占据油水界面层，从而能够更多地降低界面的界面张力；聚丙烯酰胺（HPAM）不能降低界面张力，但自身能够通过分子链的缠结向四周延伸，形成一个空间网状结构，将周围的油滴连结起来，使油分子更容易聚集。

MECHANISM OF BINARY COMPLEX SURFACTANT IN OIL - WATER INTERFACE

Mesoscopic simulation was used to study the distribution of binary compound surfactant molecules in oil-water interface. It is found that SDBS and TX100 were all distributed in the interface of oil and water. When used alone, there is an extremum of decrease of interfacial tension. However, the synergistic effect of the two is complementary to each other, increasing the distribution density of surfactant molecules at the oil-water interface and occupying more oil-water interfacial layer, and reducing the interfacial tension of the interface; polyacrylamide cannot reduce the interfacial tension, but it can form a spatial network structure and extend itself through the entanglement of molecular chains, which can connect the surrounding oil droplets and make the oil molecules gather more easily.