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A series of gemini quaternary ammonium surfactants containing carboxylate counterion with the formula C 17 H 35 CONH(CH 2 ) 2 N + (CH 3 ) 2 (CH 2 ) 2 N + (CH 3 ) 2 (CH 2 ) 2 NHCO C 17 H 35 ·2Y (Y=HCOO - , CH 3 COO - , CH 3 CHOHCOO - ) have been synthesized by a counterion conversion process and characterized by Fourier transform infrared spectroscopy and mass spectroscopy. It is found that these surfactants reduce the surface tension of water to a minimum value of 26.78 mN·m -1 at a concentration of 1.21 ×10 -5 mol·L -1 . TEM images reveal that aggregates with vesicles or tubular structure are spontaneously formed in these surfactants aqueous solution with the concentration of 1×10 -3 mol·L -1 . It is also found that they are effective corrosion inhibitors for A3 steel in acid solution and have superior antibacterial activity at a concentration of 0.1g·L -1 .

journal of oleo science

Surface Activities, Antibacterial Activity and Corrosion Inhibition Properties of Gemini Quaternary Ammonium Surfactants with Amido Group and Carboxylic Counterions