Relaxation process of of milisecond to microseconds region of adsorbed films

• Project/Area Number: 17K05837
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Functional solid state chemistry
• Research Institution: Kyushu University
• Principal Investigator: Aratono Makoto 九州大学, 理学研究院, 特任教授 (20175970)
• Project Period (FY): 2017-04-01 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000); Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2018: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2017: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
• Keywords: 表面吸着 / 表面粘弾性 / 表面光散乱 / 界面吸着 / 界面活性剤 / 粘弾性 / 水和 / 光散乱 / 電気二重層 / 表面・界面物性

Outline of Final Research Achievements

The electro capillary wave method was applied to the adsorbed films of the dihexanoylphosphatidylcholine(DC6PC) and dioctanoylphosphatidylcholine (DC8PC) mixtures and the viscoelasticity was evaluated. The relaxation characteristic frequency of the zigzag structure at the surface was estimated to be order of milliseconds.
Surface quasi elastic light scattering method was applied to the adsorbed films at the aqueous solutions of a series of polyethylenglycol monoalkyl ether (CiEj)/air interface, where i was fixed at 8 and 10 and j was changed from 1 to 6. The elasticity was steeply increased with increasing the surface concentration: it was smaller than the Gibbs elasticity at a lower surface concentration but larger at a higher surface concentration. The Lucassen-van den Tempel model did not trace the experimental results.

Academic Significance and Societal Importance of the Research Achievements

本研究成果のように、申請者自らの界面吸着の熱力学的手法（界面熱力学量や相図などによるマクロ描像）と構造科学的手法（界面全反射XAFS法や界面X線反射率法などによるミクロ描像）の研究成果とSQELS法やECW法による緩和過程の研究とを融合している研究グループは少ない。今回の研究により、ソフト界面の時空階層構造（ミリ秒～ミクロン秒の界面時間構造と、マクロ～ミクロの界面空間構造）を複合的かつ系統的に展開でき、その学術的意義は大きい。

Research Products

• [Journal Article] Thinning and thickening transitions of foam film induced by 2D liquid-solid phase transitions in surfactant-alkane mixed adsorbed films (2020)
  • Author(s): Matsubara, H., Umezaki, T., Funatsu, T., Tanaka, H., Ikeda, N., Aratono, M
  • Journal Title: ADVANCES IN COLLOID AND INTERFACE SCIENCE Volume: 282 Pages: 102206-102213
  • DOI: 10.1016/j.cis.2020.102206
  • Peer Reviewed
• [Journal Article] Common black film stability and synergetic adsorption in ionic?nonionic mixed surfactant systems (2019)
  • Author(s): Matsubara H.、Chida K.、Yoshimura M.、Aratono M.、Ikeda N.
  • Journal Title: Colloids and Surfaces A: Physicochemical and Engineering Aspects Volume: 582 Pages: 123932-123932
  • DOI: 10.1016/j.colsurfa.2019.123932
  • Peer Reviewed
• [Journal Article] Unique Interfacial Phenomena on Macroscopic and Colloidal Scales Induced by Two-Dimensional Phase Transitions (2019)
  • Author(s): H. Matsubara, M. Aratono
  • Journal Title: Langmuir Volume: 35 Issue: 6 Pages: 1989-2454
  • DOI: 10.1021/acs.langmuir.8b01203
  • Peer Reviewed
• [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
• [Journal Article] Effect of the Headgroup Structure on Counterion Binding in Adsorbed Surfactant Films Investigated by Total Reflection X-ray Absorption Fine Structure Spectroscopy (2018)
  • Author(s): Imai Yosuke、Tokiwa Yuhei、Ueno Shusaku、Tanida Hajime、Watanabe Iwao、Matsubara Hiroki、Takiue Takanori、Aratono Makoto
  • Journal Title: Bulletin of the Chemical Society of Japan Volume: 91 Issue: 10 Pages: 1487-1494
  • DOI: 10.1246/bcsj.20180167
  • NAID: 130007498122
  • Peer Reviewed / Open Access
• [Journal Article] Effect of Surface Freezing on Stability of Oil-in-Water Emulsions (2018)
  • Author(s): Tokiwa Yuhei、Sakamoto Hiromu、Takiue Takanori、Aratono Makoto、Matsubara Hiroki、Bain Colin D.
  • Journal Title: Langmuir Volume: 34 Issue: 21 Pages: 6205-6209
  • DOI: 10.1021/acs.langmuir.8b01088
  • Peer Reviewed / Int'l Joint Research
• [Presentation] ソフト界面吸着～マクロからミクロへ、静から動へ、面から線へ～ (2017)
  • Author(s): 荒殿 誠
  • Organizer: 第68回コロイドおよび界面化学討論会
  • Invited