A Novel Zwitterionic Imidazolium-Based Ionic Liquid Surfactant: 1-Carboxymethyl-3-Dodecylimidazolium Inner Salt

摘要

A novel zwitterionic imidazolium-based ionic liquid (IL) surfactant, 1-carboxymethyl-3-dodecylimidazolium inner salt, was synthesized. The molecule structure was confirmed by means of electrospray ionization mass spectrometry, 1H nuclear magnetic resonance and elemental analysis. The isoelectric point (pI) is 3.8 ± 0.1 at 35 ± 0.1 °C. The other important physicochemical parameters such as the critical micelle concentration (CMC), the surface tension at CMC (γCMC), the adsorption efficiency (pC 20), the surface pressure at CMC (ΠCMC), the maximum surface excess (Γm), the minimum molecular cross-sectional area (A min), the value of CMC/C 20 and the average number of aggregation (N m) were determined by surface tension and steady-state fluorescence probe methods, respectively.