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Studies on the phase behavior and solubilization of the microemulsion formed by surfactant-like ionic liquids with ɛ–β-fish-like phase diagram

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Abstract

The phase behavior and the solubilization of the microemulsion systems surfactant-like ionic liquids 1-hexadecyl-3-methylimidazolium bromide (C16mimBr), 1-tetradecyl-3-methylimidazolium bromide (C14mimBr), or 1-dodecyl-3-methylimidazolium bromide (C12mimBr)/alcohol/alkane/brine have been studied with ɛ–β-fish-like phase diagram method at 40 °C and an oil-to-water mass ratio of 1:1. From the ɛ–β-fish-like phase diagram, the physicochemical parameters, such as the mass fraction of alcohol in the hydrophile–lipophile-balanced interfacial layer (A S), and the solubilities of ionic liquid (S O) and alcohol (A O) in alkane phase, were calculated. The solubilization of the microemulsion system has been discussed based on the ɛ–β-fish-like phase diagram. The smaller the oil molecule, the longer the alcohol chain length, and the larger the NaCl concentration in water, the larger the solubilization of the microemulsion system. In this paper, the solubilization of the microemulsion stabilized by both C12mimBr and sodium dodecyl sulfonate (sodium dodecyl sulfate) was also investigated with the ɛ–β-fish-like phase diagram. The unequimolar composite of anionic and cationic surfactants can avoid the sedimentation aroused by the strong electrostatic attraction, and an obvious synergism effect in solubilization was obtained.

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Acknowledgment

This work was supported by the Natural Science Foundation of Shandong Province of China (Grant No.: Y2003B01).

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Authors and Affiliations

  1. Department of Chemistry, Shandong Normal University, Jinan, 250014, People’s Republic of China

    Chengkuan Qin, Jinling Chai, Jingfei Chen, Yan Xia, Xiaoying Yu & Jing Liu

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  1. Chengkuan Qin
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  2. Jinling Chai
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  3. Jingfei Chen
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  4. Yan Xia
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  5. Xiaoying Yu
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  6. Jing Liu
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Correspondence to Jinling Chai.

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Qin, C., Chai, J., Chen, J. et al. Studies on the phase behavior and solubilization of the microemulsion formed by surfactant-like ionic liquids with ɛ–β-fish-like phase diagram. Colloid Polym Sci 286, 579–586 (2008). https://doi.org/10.1007/s00396-007-1818-2

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  • DOI: https://doi.org/10.1007/s00396-007-1818-2

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