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Self-Aggregation of Catanionic Surface Active Ionic Liquids in Aqueous Solutions

  • Original Article
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Journal of Surfactants and Detergents

Abstract

The self-aggregation behavior of catanionic surface active ionic liquids (SAIL), 1-alkyl-3-methylimidazolium alkyl sulfates, [C4mim][C16SO4] and [C6mim][C14SO4], in aqueous solutions was explored by several techniques. These results were analyzed together with the concerning data of [C8mim][C12SO4] reported previously. The feature of these SAIL is that the total carbon number of the hydrophobic chains is kept constant, while only the length of the two hydrocarbon chains varies. Because of the different intermolecular and intramolecular interactions, the hydrophobic interaction of asymmetrical SAIL is enhanced, which explains the minimal CMC value of [C4mim][C16SO4]. Thermal motion of hydrocarbon chains at the air–water interface leads to higher A min and lower Γmax values with the increasing asymmetry of two hydrophobic chains. The conductivity measurements reveal that the micellization process is spontaneous and entropy-driven in the studied temperature range. This work indicates that the symmetry of alkyl chains can influence the aggregation behavior of [C n mim][C m SO4] in aqueous solutions.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (no. 21373128), Scientific and Technological Projects of Shandong Province of China (no. 2014GSF117001), Natural Science Foundation of Shandong Province of China (no. ZR2011BM017) and the Project of Sinopec (no. P13045).

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Authors and Affiliations

  1. School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, 273165, People’s Republic of China

    Wenwen Xu & Li Yu

  2. Key Laboratory of Colloid and Interface Chemistry of Ministry of Education, Shandong University, Shanda Nanlu 27#, Jinan, 250100, People’s Republic of China

    Wenwen Xu & Li Yu

  3. China Research Institute of Daily Chemical Industry, Taiyuan, 030001, People’s Republic of China

    Qian Zhang, Hongtu Wei & Jieqiong Qin

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  1. Wenwen Xu
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Correspondence to Li Yu.

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Xu, W., Zhang, Q., Wei, H. et al. Self-Aggregation of Catanionic Surface Active Ionic Liquids in Aqueous Solutions. J Surfact Deterg 18, 421–428 (2015). https://doi.org/10.1007/s11743-014-1666-2

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  • DOI: https://doi.org/10.1007/s11743-014-1666-2

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