Study of selective solvation, ionization, and chemical reaction

• Project/Area Number: 25610122
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Biological physics/Chemical physics/Soft matter physics
• Research Institution: Kyoto University
• Principal Investigator: Onuki Akira 京都大学, 理学(系)研究科(研究院), 名誉教授 (90112284)
• Co-Investigator(Kenkyū-buntansha): Okamoto Ryuichi 首都大学東京, 理工学研究科, 助教 (10636385) ; Takae Kyouhei 東京大学, 生産技術研究所, 助教 (30739321)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000); Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2014: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2013: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
• Keywords: 水和効果 / ナノバブル / 電離 / 化学反応 / 化学変化 / 極性流体 / イオン運動 / 電場効果

Outline of Final Research Achievements

1)We constructed a theory of dielectric response in liquid water using large-scale molecular dynamics simulation. We also examined nonequilibrium relaxation
after electric field reversal. 2) We presented a theory of nanobubbles when a small amount of oxygen is added to ambient water. We accounted for solvation of oxygen in water. 3) We predected that colloidal particles aggregate due to local phase separation (bridging) in near-critical binary mixture. 4) We showed various new effects when hydrophilic and hydrophobic ions (antagonistic salt) are added to water-oil mixtures.

Research Products

• [Journal Article] Structure formation due to antagonistic salts (2016)
  • Author(s): Akira Onuki, S.yunsuke Yabunaka, Takeaki Araki, and Ryuichi Okamoto
  • Journal Title: Current Opinion in Colloid and Interface Science Volume: 22 Pages: 59-64
  • DOI: 10.1016/j.cocis.2016.02.007
  • Peer Reviewed
• [Journal Article] Density functional theory of gas-liquid phase separation in dilute binary mixtures (2016)
  • Author(s): Ryuichi Okamoto, Akira Onuki
  • Journal Title: J. Phys.: Condens. Matter Volume: 28 Issue: 24 Pages: 244012-244012
  • DOI: 10.1088/0953-8984/28/24/244012
  • Peer Reviewed
• [Journal Article] Fluctuations of local electric field and dipole moments in water beween metal walls (2015)
  • Author(s): Kyohei Takae, Akira Onuki
  • Journal Title: J. Chem. Phys. Volume: 143 Issue: 15
  • DOI: 10.1063/1.4932972
  • Peer Reviewed
• [Journal Article] Bubble formation in water with addition of a hydrophobic solute (2015)
  • Author(s): Ryuichi Okamoto, Akira Onuki
  • Journal Title: The European Physical Journal E Volume: 38 Issue: 7
  • DOI: 10.1140/epje/i2015-15072-9
  • Peer Reviewed
• [Journal Article] Hydrodynamics in bridging and aggregation of two colloidal particles in a near-critical binary mixture (2015)
  • Author(s): Syunsuke Yabunaka, Ryuichi Okamoto, Akira Onuki
  • Journal Title: Soft Matter Volume: 11 Issue: 28 Pages: 5738-5747
  • DOI: 10.1039/c4sm02853h
  • NAID: 120005670909
  • Peer Reviewed
• [Journal Article] Nematic caps on colloidal particles in a nematogenic liquid under an electric field (2015)
  • Author(s): Takayuki Uchida, Takeaki Araki and Akira Onuki
  • Journal Title: Soft Matter Volume: 11 Issue: 14 Pages: 2874-2884
  • DOI: 10.1039/c5sm00088b
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Molecular dynamics simulation of water between metal walls under an electric field : dielectric response and dynamics after field reversal (2015)
  • Author(s): Kyohei Takae and Akira Onuki
  • Journal Title: The Journal of Physical Chemistry B Volume: 119 Issue: 29 Pages: 1-14
  • DOI: 10.1021/jp510296b
  • Peer Reviewed
• [Journal Article] Dynamics in a tetrahedral network glassformer : Vibrations, network rearrangements, and diffusion (2014)
  • Author(s): 川崎猛史, 金鋼, 小貫明
  • Journal Title: Journal of Chemical Physics Volume: 140 Issue: 18 Pages: 184502-184502
  • DOI: 10.1063/1.4873346
  • Peer Reviewed
• [Journal Article] Orientational glass in mixtures of elliptic and circular particles : Structural heterogeneities, rotational dynamics, and rheology (2014)
  • Author(s): Kyohei Takae and Akira Onuki
  • Journal Title: Physical Review E Volume: 89 Issue: 2 Pages: 22308-22308
  • DOI: 10.1103/physreve.89.022308
  • Peer Reviewed
• [Journal Article] Attractive interaction and bridging transition between neutral colloidal particles due to preferential adsorption in a near-critical binary mixture (2013)
  • Author(s): Ryuichi Okamoto and Akira Onuki
  • Journal Title: Physical Review Ｅ Volume: 88 Issue: 2
  • DOI: 10.1103/physreve.88.022309
  • Peer Reviewed
• [Journal Article] Applying electric field to charged and polar particles between metallic platest : Extension of the Ewald method (2013)
  • Author(s): Kyohei Takae and Akira Onuki
  • Journal Title: The Journal of Chemical Physics Volume: 139 Issue: 12 Pages: 124108-124108
  • DOI: 10.1063/1.4821085
  • Peer Reviewed
• [Journal Article] Formation of double glass in binary mixtures of anisotropic particles : Dynamic heterogeneities in rotations and displacements (2013)
  • Author(s): Kyohei Takae and Akira Onuki
  • Journal Title: Physical Review E Volume: 88 Issue: 4 Pages: 42317-42317
  • DOI: 10.1103/physreve.88.042317
  • Peer Reviewed
• [Presentation] Parametric resonance in glass (2016)
  • Author(s): Akira Onuki
  • Organizer: Avalanches, plasticity, and nonlinear response in nonequilibrium solids
  • Place of Presentation: Yukawa Institute, Kyoto University
  • Year and Date: 2016-03-07
  • Invited
• [Presentation] Electric field effects in water (2015)
  • Author(s): Akira Onuki
  • Organizer: Pacifichem 2015
  • Place of Presentation: Honolulu, Hawai
  • Year and Date: 2015-12-15
  • Invited
• [Presentation] Phase field model with evaporation and condensation (2015)
  • Author(s): Akira Onuki
  • Organizer: Coupled problems 2015
  • Place of Presentation: Venice, Italy
  • Year and Date: 2015-05-16
  • Invited
• [Remarks] akira Onuki
  • URL: http://www016.upp.so-net.ne.jp/onukiakira
• [Remarks] Akira Onuki
  • URL: http://www016.upp.so-net.ne.jp/onukiakira/