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Estimation of a eutectic composition of imidazolium chloride ionic liquids using video imaging and impedance methods
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| Title: | Estimation of a eutectic composition of imidazolium chloride ionic liquids using video imaging and impedance methods |
| Authors: | Ooki, Atsuhi Browse this author | | Azumi, Kazuhisa Browse this author →KAKEN DB |
| Keywords: | Melting point | | Eutectic temperature | | Eutectic composition | | Video imaging | | Phase diagram | | Impedance |
| Issue Date: | Jul-2022 |
| Publisher: | Elsevier |
| Journal Title: | Fluid phase equilibria |
| Volume: | 558 |
| Start Page: | 113442 |
| Publisher DOI: | 10.1016/j.fluid.2022.113442 |
| Abstract: | The eutectic temperature T-e and composition X-e of binary systems composed of three ionic liquids, 1-ethyl-3-methylimidazolium chloride ([C(2)MiM] Cl), 1-methyl-3-propylimidazolium chloride ([C(3)MiM]Cl), and 1-butyl-3-methylimidazolium chloride ([C(4)mim]Cl), were estimated using a video imaging method, in which the formation of a liquid phase on solidified ionic liquids at a given composition stored in a vial was detected from time-lapse images taken during temperature scanning. The advantage of this method is that multiple samples (five samples in this study) could be measured simultaneously, whereas its disadvantage is a less accurate determination of the melting point compared with the conventional differential scanning calorimetry (DSC) method. The T-e and X-e of [C(2)min]CHC(3)mim]Cl, [C(2)min]CHC(4)mim]Cl, and [C(3)mim]Cl-[C(4)mim]Cl binary systems were roughly estimated. Furthermore, the T e of the ternary system of the [C(2)mim]Cl-[C(3)mim]Cl-[C(4)mim]Cl with limited compositions was estimated, which was lower than that of the binary systems. The transition of the electrochemical impedance of [C(2)mim]Cl ionic liquids was also measured using two Pt wire electrodes as a function of temperature. The differential inversed resistance curve (dR(-1)/dT)-T shows an obvious peak corresponding to the phase transition from a low conductive solid phase to a highly conductive liquid phase. This peak was comparable with the peak obtained in the DSC measurement. (C) 2022 Elsevier B.V. All rights reserved. |
| Rights: | ©2022. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/ | | http://creativecommons.org/licenses/by-nc-nd/4.0/ |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/91261 |
| Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 安住 和久
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