The study on surface and interfacial activity of aryl sulfate Gemini surfactant

The surface and interfacial activity of aryl sulfate Gemini surfactant (NPA-2, NPA-3, NPA-4) were determined by the full automatic surface tensiometer and spinning drop interfacial tensiometer and were investigated through changing the concentration of surfactant, environmental temperature and water phase salinity. The results indicate that the surface and interfacial activity of anionic Gemini surfactant of NPA series increase with the increasing of the carbon number of spacer groups (S = 2, 3, 4). And the Critical Micelle Concentration (CMC) of NPAs is one magnitude lower than that of traditional single-stranded anionic surfactants (SDS, SDBS). The surface and interfacial activity property of NPA-4 is also improved by the rising temperature and water phase salinity. Moreover, this anionic Gemini surfactant can achieve the requirement of low interfacial tension for special oil and gas reservoirs, and the IFT of its water solution with high salinity can reach 0.0125 mN/m.