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Synthesis and Self-Aggregation of a Hydroxyl-Functionalized Imidazolium-Based Ionic Liquid Surfactant in Aqueous Solution

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Journal of Surfactants and Detergents

Abstract

This paper deals with the synthesis and self-aggregation of a hydroxyl-functionalized imidazolium-based ionic liquid (IL) surfactant, namely 1-hydroxyethyl-3-dodecylimidazolium chloride ([C2OHC12im]Cl). The molecular structure was confirmed by means of electrospray ionization mass spectrometry (ESI–MS), 1H nuclear magnetic resonance (1H NMR) and elemental analysis. Many 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 (Γ m ), the minimum molecular cross-sectional area (A min), the value of CMC/C 20, the average number of aggregation (N m ) and the micellar microenvironment polarity were determined by surface tension-concentration curves, fluorescence spectra, and electrical conductivity. The phenomena of the second CMC, the concentration dependence of N m , and the critical average aggregation number (N m,c) of imidazolium-based IL surfactants are reported for the first time in this paper.

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Acknowledgments

This work was financially supported in part by the Fundamental Research Funds for the Central Universities (JUSRP20905) and the youth funds of Jiangnan University (2007LQN14), and Jiangsu Key Laboratory of Fine Chemicals (KF0903).

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Authors and Affiliations

  1. School of Chemical and Materials Engineering, Jiangnan University, Wuxi, 214122, People’s Republic of China

    Xue-feng Liu, Li-li Dong & Yun Fang

  2. Jiangsu Key Laboratory of Fine Chemicals, Jiangsu, China

    Yun Fang

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  1. Xue-feng Liu
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  2. Li-li Dong
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Correspondence to Xue-feng Liu.

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Liu, Xf., Dong, Ll. & Fang, Y. Synthesis and Self-Aggregation of a Hydroxyl-Functionalized Imidazolium-Based Ionic Liquid Surfactant in Aqueous Solution. J Surfact Deterg 14, 203–210 (2011). https://doi.org/10.1007/s11743-010-1234-3

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