Solvent effects on gel fracture

• Project/Area Number: 24540432
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Biophysics/Chemical physics
• Research Institution: Yokohama National University
• Principal Investigator: Tanaka Yoshimi 横浜国立大学, 環境情報研究科(研究院), 准教授 (10315830)
• Co-Investigator(Renkei-kenkyūsha): Yamaguchi Tetsuo 九州大学, 工学府, 准教授 (20466783)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000); Fiscal Year 2014: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2012: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
• Keywords: ゲル / 破壊 / 溶媒効果 / ソフトマター / mechano-chemical / fracture / gel

Outline of Final Research Achievements

Tearing experiment was conducted on an acrylamide gel synthesized from aqueous monomer solution to investigate how fracture behaviors are modified by pouring several solvents into crack tips. 1) Pouring of water, a good solvent of polyacrylamide, reduces the tearing force F for low crack velocities V. 2) For pouring of good solvent different from water, such as ethylene glycol and glycerol, enhancement of F occurs for a large V region, but this effect disappears for lower V. 3) Pouring of poor solvent for polyacrylamide, such as ethanol, causes a stick slip-like crack propagation in the whole V range in the experiment, and the time average of F is larger than that in air or in other solvents.

Research Products

• [Presentation] ゲルを通じて破壊現象を見る (2014)
  • Author(s): 田中良巳
  • Organizer: 日本応用数理学会研究部会「連続体力学の数理」
  • Place of Presentation: 京都大学百周年時計台記念館会議
  • Year and Date: 2014-10-11 – 2014-10-13
  • Invited
• [Presentation] ゲル破壊の溶媒効果 (2014)
  • Author(s): 田中良巳
  • Organizer: 物理学会
  • Place of Presentation: 中部大学
  • Year and Date: 2014-09-15 – 2014-09-20
• [Presentation] 相分離と破壊の競合によるスティック スリップ現象 (2013)
  • Author(s): 吉田岳，矢野智嗣，佐藤勝彦，山口哲生，田中良巳
  • Organizer: 日本物理学会2013年秋季大会
  • Place of Presentation: 徳島大学
• [Presentation] Stick-slip Motions in Sliding Friction of Sticky Gel-sheets (2013)
  • Author(s): Tetsuo Yamaguchi
  • Organizer: Adhesion Society Annual Meeting
  • Place of Presentation: Hilton Daytona Beach, Daytona Beach, FL, USA
• [Presentation] ゲル破壊現象における化学-学共役効果（ポスター発表） (2012)
  • Author(s): 吉田岳, 山田洋希, 山口哲生, 田中良巳
  • Organizer: 京大基礎物理学研究所研究会 非平衡系の物理 -その普遍的理解を目指して
  • Place of Presentation: 京都大学
• [Presentation] 物理ゲルの付着現象（ポスター発表） (2012)
  • Author(s): 中道哲平, 塩尻忠史, 田中良巳
  • Organizer: 京大基礎物理学研究所研究会 非平衡系の物理 -その普遍的理解を目指して
  • Place of Presentation: 京都大学