2011•Acta Petrolei Sinica(Petroleum Processing Section)Requires access
Interfacial Properties of Quaternary Ammonium Gemini Surfactants in Aqueous Solutions
Meiqin Lin
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Abstract
Interfacial properties of quaternary ammonium Gemini surfactants in aqueous solution were studied due to their special excellent surface activity in surfactant flooding system.DCAT-21 surface tension meter were adopted to determine the variation of surface tension and interfacial tension of different molecular structures of C_n-s-C_n·2Br in aqueous solution.Effect of mineral salt on the surface activity of Gemini surfactants aqueous solutions were investigated as well. Experiments indicated that the surface and interfacial tension reduction of C_n-s-C_n·2Br aqueous solution decreased as the length of spacer(s) increased while the length of alkyl chain(n) was 12. Critical micelle concentration(CMC) of quaternary ammonium Gemini surfactants decreased as the length of alkyl chain(n) increased.Their CMC were much lower(about 2 orders of magnitude) than that of corresponding common surfactants,and could be lowered by mineral salt.The outstanding surface activity of Gemini surfactants was owing to their unique molecular structure.