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Dielectric spectroscopy study on ionic liquid microemulsion composed of water, TX-100, and BmimPF6

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Title: Dielectric spectroscopy study on ionic liquid microemulsion composed of water, TX-100, and BmimPF6
Authors: Chen, Zhen Browse this author
Nozaki, Ryusuke Browse this author →KAKEN DB
Issue Date: 28-Jun-2012
Publisher: American Institute of Physics
Journal Title: Journal of Chemical Physics
Volume: 136
Issue: 24
Start Page: 244505
Publisher DOI: 10.1063/1.4730037
PMID: 22755585
Abstract: We report here a broadband dielectric spectroscopy study on an ionic liquid microemulsion (ILM) composed of water, Triton X-100 (TX-100), and 1-butyl-3-methylimidazolium hexafluorophosphate (bmimPF6). It is found that the phase behavior of this ILM can be easily identified by its dielectric response. The dielectric behavior of the ILM in the GHz range is consistent with that of TX-100/water mixtures with comparable water-to-TX-100 weight ratio. It consists of the relaxations due to ethylene oxide (EO) unit relaxation, hydration water dynamics, and/or free water dynamics. The water content dependence of the EO unit relaxation suggests that this relaxation involves dynamics of hydration water molecules. In the IL-in-water microemulsion phase, it is found that bmimPF6 molecules are preferentially dissolved in water when their concentration in water is lower than the solubility. An additional dielectric relaxation that is absent in the TX-100/water mixtures is observed in the frequency range of 10^[7]-10^[8] Hz for this ILM. This low-frequency relaxation is found closely related to the bmimPF6 molecule and could be attributed to the hopping of its cations/anions between the anionic/cationic sites.
Rights: Copyright 2012 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in J. Chem. Phys. 136, 244505 (2012) and may be found at https://dx.doi.org/10.1063/1.4730037
Type: article
URI: http://hdl.handle.net/2115/49708
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 野嵜 龍介

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