A series of carboxylic ester-containing imidazolium-based zwitterionic surfactants, namely, monoalkyl 2-(3-methylimidazolium-1-yl) succinate inner salts (CnMimSU, n = 8, 10, 12 and 14), have been synthesized. Their structures were confirmed by 1H NMR, 13C NMR and FTIR. The typical physicochemical properties parameters such as isoelectric point, critical micelle concentration (CMC), surface tension at CMC (γ CMC), surface pressure at CMC (ΠCMC), adsorption efficiency (pC 20), the maximum surface excess (Γ m), the minimum molecular cross-sectional area (A min) and the value of CMC/C 20 were determined. The effect of the long-chain length on the important physicochemical properties of CnMimSU was studied. It is found that the surface activity of CnMimSU is enhanced with the long-chain length increases.
Journal of Surfactants and Detergents – Springer Journals
Published: Jun 20, 2017
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