Physical Chemistry of the Formation of Inhomogeneous Structures in Soft Interfacial Films Caused by Ion Interactions in Electrical Double Layer

• Project/Area Number: 16K17858
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Physical chemistry
• Research Institution: Kyushu University
• Principal Investigator: Yosuke Imai 九州大学, 基幹教育院, 助教 (90738816)
• Research Collaborator: TANIDA Hajime
• Project Period (FY): 2016-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2017: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000); Fiscal Year 2016: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
• Keywords: ソフト界面 / 吸着膜ドメイン / 全反射XAFS法 / 凝縮膜ドメイン / 電気二重層 / 液液全反射XAFS / イオン間相互作用 / 界面膜ドメイン / 放射光X線界面構造解析

Outline of Final Research Achievements

(1) Counterion binding in adsorbed surfactant films at oil/water interfaces was evaluated by total reflection X-ray absorption fine structure spectroscopy, (2) Phase transition between low density and high density of films and domain formation were observed in adsorbed films of 1-decanol at air/water interfaces, (3) The relation between counterion binding and molecular interaction in the adsorbed films of tetradecyltrimethylammonium bromide and tetradecylphosphocholine mixtures. These results contribute further researches to clarify the effects of ion interactions in the electrical double layer on domain formation in soft interfacial films.

Research Products

• [Journal Article] Surface dilational viscoelasticity of aqueous surfactant solutions by surface quasi-elastic light scattering (2018)
  • Author(s): S. Ueno, Y. Takajo, S. Ikeda, R. Takemoto, Y. Imai, T. Takiue, H. Matsubara, M. Aratono
  • Journal Title: Colloid and Polymer Science Volume: 296 Issue: 4 Pages: 781-794
  • DOI: 10.1007/s00396-018-4297-8
  • Peer Reviewed
• [Presentation] Effect of headgroup structure on counterion binding in surfactant adsorbed films studied through total reflection XAFS (2018)
  • Author(s): Yosuke Imai, Hiroki Matsubara, Takanori Takiue, Makoto Aratono
  • Organizer: 31st Conference of European Colloid and Interface Society
  • Int'l Joint Research
• [Presentation] Specific Ion Effects on Counterion Binding in Surfactant Adsorbed Films Studied through Total Reflection XAFS (2017)
  • Author(s): Yosuke Imai, Hiroki Matsubara, Takanori Takiue, Makoto Aratono
  • Organizer: Asian International Symposium Colloid and Surface Chemistry
  • Place of Presentation: 慶応義塾大学
  • Int'l Joint Research / Invited
• [Presentation] Effect of surface phase transition and surface charge density on counterion binding in surfactant-alkane mixed adsorbed films (2016)
  • Author(s): Yosuke Imai, Teruko Funatsu, Hiroki Matsubara, Takanori Takiue, Makoto Aratono
  • Organizer: 4th International Kyushu Colloid Colloquium
  • Place of Presentation: 西新プラザ
  • Year and Date: 2016-09-27
  • Int'l Joint Research
• [Presentation] 陽イオン界面活性剤―アルカン混合吸着膜の対イオン結合度に吸着膜の相転移と表面電荷密度が及ぼす効果 (2016)
  • Author(s): 今井 洋輔、船津 光子、瀧上 隆智、松原 弘樹、荒殿 誠
  • Organizer: 第６７回コロイドおよび界面化学討論会
  • Place of Presentation: 北海道教育大学旭川校
  • Year and Date: 2016-09-22
• [Presentation] 全反射XAFS法を用いたソフト界面吸着膜の 対イオン結合度に関する研究 (2016)
  • Author(s): 今井 洋輔
  • Organizer: ソフト界面科学研究会
  • Place of Presentation: 関西学院大学
  • Year and Date: 2016-08-29
  • Invited