Reversible control of the number of water molecules bound on the polymerized ionic liquids

• Project/Area Number: 26248049
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Polymer/Textile materials
• Research Institution: Tokyo University of Agriculture and Technology
• Principal Investigator: Ohno Hiroyuki 東京農工大学, 工学(系)研究科(研究院), 教授 (00176968)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥40,820,000 (Direct Cost: ¥31,400,000、Indirect Cost: ¥9,420,000); Fiscal Year 2016: ¥10,270,000 (Direct Cost: ¥7,900,000、Indirect Cost: ¥2,370,000); Fiscal Year 2015: ¥10,140,000 (Direct Cost: ¥7,800,000、Indirect Cost: ¥2,340,000); Fiscal Year 2014: ¥20,410,000 (Direct Cost: ¥15,700,000、Indirect Cost: ¥4,710,000)
• Keywords: イオン液体 / 相転移 / 水和水 / 高分子電解質 / 温度依存性 / 可逆変化 / 高分子 / ゲル / 温度応答 / 水和 / 脱水和 / 高分子ゲル / LCST

Outline of Final Research Achievements

We have succeeded to prepare ionic liquid based polyelectrolytes to show lower critical solution temperature (LCST)-type phase change in water. Relationship between such LCST type characteristics and structure of ionic liquids was studied. Throughout these basic studies, we have succeeded to prepare LCST-type polyelectrolytes and their gels. Such gels were found to reversibly absorb/desorb water driven by a small temperature change. This LCST type phase change of the gels was confirmed even in salt solutions like sea water. Adsorbed metal ions such as Co(II) ions were trapped in the gel and release of only water was found by a small temperature change. Basic knowledge on the design of functional ionic liquid gels has been established by this study.

Research Products

• [Int'l Joint Research] Universidade de Aveiro(ポルトガル)
• [Int'l Joint Research] Imperial College(英国)
• [Journal Article] Rheopectic gel formation of temperature and shear stress responsive ionic liquid/water mixtures (2017)
  • Author(s): Y. Fukaya, T. Nakano, and H. Ohno
  • Journal Title: Australian J. Chem. Volume: 70 Issue: 1 Pages: 74-78
  • DOI: 10.1071/ch16228
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] 1.A Thermoresponsive poly(ionic liquid) membrane enables concentration of proteins from aqueous media (2016)
  • Author(s): Y. Kohno, D.L. Gin, R.D. Noble, and H. Ohno
  • Journal Title: Chem. Comm. Volume: 52 Issue: 47 Pages: 7497-7500
  • DOI: 10.1039/c6cc02703b
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Design and control of LCST behaviour of zwitterion/aqueous Broensted acid mixtures (2016)
  • Author(s): Y. Mieno, Y. Kohno, S. Saita, and H. Ohno
  • Journal Title: Chemistry - A European J. Volume: 22 Issue: 35 Pages: 12262-12265
  • DOI: 10.1002/chem.201683561
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Thermoresponsive poly(ionic liquid)s in aqueous salt solutions: The salting-out effect on their phase behaviors and water absorption/desorption properties (2016)
  • Author(s): A. Okafuji, Y. Kohno, and H. Ohno
  • Journal Title: Macromol. Rapid Communication Volume: 印刷中 Issue: 14 Pages: 1130-134
  • DOI: 10.1002/marc.201500752
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] A fine tuning of LCST-type phase transition of poly(ionic liquid)s in water (2015)
  • Author(s): Y. Deguchi, Y. Kohno, and H. Ohno
  • Journal Title: Chemistry Letters Volume: 44 Issue: 3 Pages: 238-240
  • DOI: 10.1246/cl.141016
  • NAID: 130004712954
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Reversible water uptake/release by thermoresponsive polyelectrolyte hydrogels derived from ionic liquids (2015)
  • Author(s): Y. Deguchi, Y. Kohno, and H. Ohno
  • Journal Title: Chemical Communications Volume: 51 Issue: 45 Pages: 9287-9290
  • DOI: 10.1039/c5cc02189h
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Is seven the minimum number of water molecules per ion pair for assured biological activity in ionic liquid/water mixtures? (2015)
  • Author(s): Hiroyuki Ohno, Kyoko Fujita, Yuki Kohno
  • Journal Title: Physical Chemistry Chemical Physics Volume: 印刷中 Issue: 22 Pages: 14454-14460
  • DOI: 10.1039/c5cp00768b
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Thermoresponsive polyelectrolytes derived from ionic liquids (2015)
  • Author(s): Yuki Kohno, Shohei Saita, Yongjun Men, Jiayin Yuane and Hiroyuki Ohno
  • Journal Title: Polymer chemistry Volume: 6 Issue: 12 Pages: 2163-2178
  • DOI: 10.1039/c4py01665c
  • Peer Reviewed / Open Access
• [Journal Article] Ammonium based zwitterions showing both LCST- and UCST-type phase transitions after mixing with water in a very narrow temperature range (2014)
  • Author(s): Shohei Saita, Yuki Mieno, Yuki Kohno, and Hiroyuki Ohno
  • Journal Title: Chemical Communications Volume: 50 Issue: 97 Pages: 15450-15452
  • DOI: 10.1039/c4cc06210h
  • Peer Reviewed
• [Presentation] 1665.温度応答性イオン液体由来ハイドロゲルのタンパク質吸着挙動の評価 (2017)
  • Author(s): 濱健一郎、岡藤亮佳、大野弘幸
  • Organizer: 日本化学会第97春季年会
  • Place of Presentation: 慶應義塾大学 日吉キャンパス （神奈川県横浜市港北区）
• [Presentation] 温度応答性ホスホニウム型イオン液体由来高分子電解質ゲルによる重金属イオンの抽出 (2016)
  • Author(s): 大隈崇裕、岡藤亮佳、河野雄樹、大野弘幸
  • Organizer: 第65回高分子学会年次大会
  • Place of Presentation: 神戸国際会議場・展示場 (兵庫県神戸市中央区)
• [Presentation] Development of ionic liquids that show LCST-type phase transition with water (2016)
  • Author(s): H. Ohno and Y. Kohno
  • Organizer: Gordon Research Conference, Ionic Liquids for Future Technologies
  • Place of Presentation: Sunday River Hotel, Newry, ME, USA
  • Int'l Joint Research
• [Presentation] イオン液体由来ハイドロゲルのLCST型相転記挙動に及ぼす塩濃度の効果 (2016)
  • Author(s): 岡藤亮佳、河野雄樹、大野弘幸
  • Organizer: 第7回イオン液体討論会
  • Place of Presentation: 金沢市文化ホール (石川県金沢市)
• [Presentation] Phase behavior of polyampholytes derived from ionic liquids showing LCST-type phase change in water (2016)
  • Author(s): A. Okafuji, Y. Kohno and H. Ohno
  • Organizer: 11th SPSJ International Polymer Conference
  • Place of Presentation: 福岡国際会議場 （ 福岡県福岡市博多区）
  • Int'l Joint Research
• [Presentation] Control of temperature-driven phase change of ionic liquid/water mixtures (2015)
  • Author(s): H. Ohno
  • Organizer: International Chemical Congress of Pacific Basin Societies 2015
  • Place of Presentation: International Congress Centre, Honolulu,Hawaii, USA
  • Year and Date: 2015-12-15
  • Int'l Joint Research
• [Presentation] 温度により可逆的に相状態を制御できるzwitterion/水二相系の設計 (2015)
  • Author(s): 三重野裕貴、大野弘幸
  • Organizer: 第6回イオン液体討論会
  • Place of Presentation: 寒梅館、同志社大学、京都、京都府京都市上京区御所八幡町
  • Year and Date: 2015-10-26
• [Presentation] Polymerized ionic liquids: From ion conductive materials to water pump (2015)
  • Author(s): H. Ohno
  • Organizer: 250th ACS National Meeting
  • Place of Presentation: Boston Convention and Exhibition Center, Boston, MA, USA
  • Year and Date: 2015-08-16
  • Invited
• [Presentation] Some unique properties of ionic liquid/water mixtures (2015)
  • Author(s): H. Ohno
  • Organizer: Royal Society of Chemistry, Molten Salt Discussion Group, Summer Research Meeting 2015
  • Place of Presentation: Fitzwilliam College, University of Cambridge, England
  • Year and Date: 2015-08-03
  • Int'l Joint Research / Invited
• [Presentation] 1555.水と混合後LCST型とUCST型の相転移を示すzwitterionの設計 (2014)
  • Author(s): 三重野裕貴、税田祥平、大野弘幸
  • Organizer: 第5回イオン液体討論会
  • Place of Presentation: 神奈川県 横浜シンポジア
  • Year and Date: 2014-10-28 – 2014-10-29
• [Presentation] 1554.Functionalisation of ionic liquids realised by the control of hydrophobicity/hydrophilicity balance (2014)
  • Author(s): H. Ohno
  • Organizer: 4th Asia Pacific Conference on Ionic Liquids and Green Processes
  • Place of Presentation: オーストラリア、シドニー
  • Year and Date: 2014-09-28 – 2014-10-01
  • Invited
• [Presentation] 1542.LCST型相転移を示すイオン液体由来高分子ハイドロゲルの設計 (2014)
  • Author(s): 出口由希、大野弘幸
  • Organizer: 第63回高分子討論会
  • Place of Presentation: 長崎県 長崎大学
  • Year and Date: 2014-09-24 – 2014-09-26
• [Presentation] 1532.Design and control of ionic liquid/water mixtures showing LCST-type phase transition (2014)
  • Author(s): S. Saita and H. Ohno
  • Organizer: 2nd International Conference on Ionic Liquids in Separation and Purification Technology
  • Place of Presentation: カナダ、トロント
  • Year and Date: 2014-06-29 – 2014-07-02