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Broadband Dielectric Spectroscopy of Micelles and Microemulsions Formed in a Hydrophilic Ionic Liquid: Relaxation Mechanism and Interior Parameters

Abstract

Three striking dielectric relaxations located at 100MHz, 1GHz and 10GHz respectively were observed both in binary mixtures of p-(1,1,3,3-tetramethylbutyl)phenoxypolyoxyethyleneglycol (TX-100) and 1-butyl-3-methylimidazolium tetrafluoroborate ([bmim][BF4]), and [bmim][BF4]/TX-100/cyclohexane microemulsions in a wide frequency range. The mechanisms of the dielectric relaxations were proposed and the detailed characterizations of low-frequency relaxation(around 100 MHz), which is identify as interface polarization, were analyzed theoretically. The dielectric parameters (relaxation time dielectric increment) were obtained by fitting the dielectric spectra with Debye plus Cole-Cole formula. The low-frequency relaxation mechanisms of both binary and ternary systems are contributed to interfacial polarization, supported by the good agreement between relaxation times calculated by Maxwell-Wagner theory and the values obtained from experiment. Meanwhile, by analyzing the linear ionic liquid content dependence of dielectric increment of low-frequency relaxation, we find that this relaxation involves the dynamics of ionic liquids which located at the interface. Besides, the phase parameters, which reflect the interior properties of the binary and ternary systems, were calculated by Hanai theory, and the dependence of them on the variation of sample composition are properly explained; the distribution of cyclohexane in dispersed phase is obtained quantitatively, which is of important in the study field of microstructure of ionic liquid microemulsions.

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Publication details

The article was accepted on 04 Jan 2018 and first published on 05 Jan 2018


Article type: Paper
DOI: 10.1039/C7NJ04813K
Citation: New J. Chem., 2018, Accepted Manuscript
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    Broadband Dielectric Spectroscopy of Micelles and Microemulsions Formed in a Hydrophilic Ionic Liquid: Relaxation Mechanism and Interior Parameters

    K. Zhao and Y. Lian, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C7NJ04813K

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