Interfacial tensions of imidazolium-based ionic liquids with water and n-alkanes

Ramesh L. Gardas, Rile Ge, Norfaizah Ab Manan, David W. Rooney, Christopher Hardacre

    Research output: Contribution to journalArticlepeer-review


    The interfacial tension of the liquid-liquid phase boundary of several 1,3-dialkyl imidazolium based ionic liquids, namely, 1,3-dimethylimidazolium bis{(trifluoromethyl)sulfonyl}imide [C1mim][NTf2], 1-ethyl-3-methylimidazolium bis{(trifluoromethyl)sulfonyl}imide [C2mim][NTf2], 1-butyl-3-methylimidazolium bis{(trifluoromethyl)sulfonyl}imide [C4mim][NTf2], 1-hexyl-3-methylimidazolium bis{(trifluoromethyl)sulfonyl}imide [C6mim][NTf2], 1-octyl-3-methylimidazolium bis{(trifluoromethyl)sulfonyl}imide [C8mim][NTf2], 1-butyl-3-methylimidazolium trifluoromethylsul-fonate [C4mim][CF3SO3], and 1-butyl-3-methylimidazolium trifluoroacetate [C4mim][CF3COO] with water and with the n-alkanes, n-hexane, n-octane and n-decane, has been measured using the pendant drop method as a function of temperature from 293 to 323 K. The experimental interfacial tension data were correlated using the ionic liquid parachor estimation method and a mutual solubility model. The influence of the cation and anion of ionic liquids and also of alkyl chain length of n-alkanes on interfacial tension is discussed. It has also been demonstrated that the interfacial tension data estimated by the correlation methods are in good agreement with the experimental data.

    Original languageEnglish
    Pages (from-to)139-147
    Number of pages9
    JournalFluid Phase Equilibria
    Issue number1-2
    Publication statusPublished - Jul 2010


    • Correlation
    • Interfacial tension
    • Ionic liquid
    • Mutual solubility
    • Pendant drop method


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