Abstract
The composition and structural parameters of W/O microemulsions containing the gemini surfactant 1,4-bis(3-alkylimidazolium-1-yl) butane bromide [(Cn-4-Cn)Br2, n = 12, 14, 16] + pentan-1-ol + octane + water and W/O microemulsions containing the ionic liquid surfactant 1-alkyl-3-methylimidazolium (CnmimBr, n = 12, 14, 16) + pentan-1-ol + octane + water were studied and compared. The mole fractions of the n-alkyl alcohol at the interfacial layer \(X_{\text{a}}^{\text{i}}\) in (Cn-4-Cn)Br2 based microemulsion systems are always larger than those in CnmimBr based microemulsion systems. However, the mole fractions of the n-alkyl alcohol in the oil phase \(X_{\text{a}}^{\text{o}}\) are nearly the same for both the microemulsion systems. The (Cn-4-Cn)Br2 based microemulsion systems have greater absolute values of the free enthalpy values \(- \Delta G_{{{\text{o}} \to {\text{i}}}}^{\text{o}}\) than that for CnmimBr based systems. In the (Cn-4-Cn)Br2 based microemulsion systems, a large number of cosurfactants at the interfacial layer is conducive to the formation of a smaller droplet W/O microemulsion. The effects of n-alkyl alcohols, alkanes, salinity and temperature on the composition and structural parameters of the (Cn-4-Cn)Br2 based and CnmimBr based microemulsion systems were also investigated and discussed.
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This work was supported by the National Natural Science Foundation of China (Grant No. 21476133).
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Chai, J., Song, J., Wang, D. et al. Comparison of the Composition and Structural Parameters of W/O Microemulsions Containing Gemini Imidazoliums with Those Containing Monomeric Analogues. J Surfact Deterg 18, 287–295 (2015). https://doi.org/10.1007/s11743-014-1648-4
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DOI: https://doi.org/10.1007/s11743-014-1648-4