Studies on Phase Separation of Ionic Liquid-Molecular Liquid Mixtures with UCST and LCST on the Molecular Scale
| Project/Area Number |
18K05038
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 32010:Fundamental physical chemistry-related
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| Research Institution | Saga University |
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Principal Investigator |
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| Project Period (FY) |
2018-04-01 – 2021-03-31
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| Project Status |
Completed (Fiscal Year 2020)
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| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2018: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Keywords | イオン液体 / 相分離 / 上部臨界溶液温度 / 下部臨界溶液温度 / アルキル鎖長依存性 / 小角中性子散乱法 / 溶媒クラスター / 均一液-液抽出法 / イミダゾリウム系イオン液体 / ホスホニウム系イオン液体 / 分子性液体 / 水素結合 / 静電的相互作用 / 3D-Ising / 平均場 / クロスオーバー / シクロエーテル / ホルムアミド / 双極子－双極子相互作用 / クラスター / 臨界指数 / 3D-Ising機構 / 物質分離 |
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| Outline of Final Research Achievements |
Despite electrolytes, ionic liquids (ILs) are in the liquid state under ambient conditions. We have clarified the mixing states of ILs with molecular liquids (MLs), such as 1,4-dioxane and formamide, and phase separation of their mixtures using IR spectroscopy, NMR and small-angle neutron scattering (SANS) techniques. Moreover, molecular dynamics (MD) simulations have been conducted on the IL-ML mixtures to compare with the experimental results obtained from the above methods. Imidazolium-based ILs often lead phase separation with an upper critical solution temperature (UCST), while phosphonium-based ILs make that with a lower critical solution temperature (LCST). We succeeded in clarifying the mechanisms of phase separation of IL-ML mixtures, which depend on the kinds of MLs and the alkyl chain length of ILs, from both experimental and theoretical results on the molecular scale.
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| Academic Significance and Societal Importance of the Research Achievements |
イオン液体は低揮発性から環境にやさしい抽出溶媒として注目されており、イオン液体-分子性液体混合溶液の温度変化に伴う相分離を応用した均一液-液抽出法が研究されている。相分離後の上相と下相は、それぞれ、ニートな分子性液体とイオン液体ではなく、少量のイオン液体または分子性液体が混合した分子性液体リッチ相とイオン液体リッチ相である。したがって、この相分離現象を応用すれば目的物質をその極性に応じて上相や下相に抽出することが期待できる。しかし、上相や下相の組成及び溶媒物性といった基礎的データはない。本研究の目的は、相分離メカニズムを分子論的に解明し、イオン液体の抽出溶媒としての応用を拡大することにある。
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Report
(4 results)
Research Products
(53 results)
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[Journal Article] Mixing states of imidazolium-based ionic liquid, [C4mim][TFSI], with cycloethers studied by SANS, IR, and NMR experiments and MD simulations2020
Author(s)
Kawano Masahiro, Sadakane Koichiro, Iwase Hiroki, Matsugami Masaru, Marekha Bogdan A., Idrissi Abdenacer, Takamuku Toshiyuki
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Journal Title
Physical Chemistry Chemical Physics
Volume: 22
Issue: 9
Pages: 5332-5346
DOI
Related Report
Peer Reviewed
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[Journal Article] Effects of the Long Octyl Chain on Complex Formation of Nickel(II) with Dimethyl Sulfoxide, Methanol, and Acetonitrile in Ionic Liquid of [C8mim][TFSA]2019
Author(s)
T. Takamuku, H. Sakurai, A. Ogawa, A. Tashiro, M. Kawano, Y. Kawazu, K. Sadakane, H. Iwase, K. Ozutsumi
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Journal Title
Phys. Chem. Chem. Phys.
Volume: 21
Issue: 6
Pages: 3154-3163
DOI
Related Report
Peer Reviewed
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[Journal Article] Hydrogen Bonds of the Imidazolium-ring of Ionic Liquids with DMSO Studied by NMR, Soft X-ray Spectroscopy, and SANS2018
Author(s)
T. Takamuku, T. Tokuda, T. Uchida, K. Sonoda, B. A. Marekha, A. Idrissi, O. Takahashi, Y. Horikawa, J. Matsumura, T. Tokushima, H. Sakurai, M. Kawano, K. Sadakane, H. Iwase
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Journal Title
Phys. Chem. Chem. Phys.
Volume: 20
Issue: 18
Pages: 12858-12869
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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[Presentation] Homogeneous Mixing of Imidazolium-based Ionic Liquids with DMSO Caused by the Strong Hydrogen Bonds between Them2018
Author(s)
T. Takamuku, T. Tokuda, T. Uchida, K. Sonoda, B. A. Marekha, A. Idrissi, O. Takahashi, Y. Horikawa, J. Matsumura, T. Tokushima, H. Sakurai, M. Kawano, K. Sadakane, H Iwase
Organizer
Joint Conference of EMLG/JMLG Meeting 2018 and 41st Symposium on Solution Chemistry of Japan
Related Report
Int'l Joint Research
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