Abstract: 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.

Key words: surfactant, SDBS, TX100, HPAM, oil-water interface, mesoscopic simulation