Effect of mechanical interactions between polymers and fluids on flow dynamics of the polymer solution

2021 Fiscal Year Final Research Report

• Project/Area Number: 19H02497
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 27010:Transport phenomena and unit operations-related
• Research Institution: Kobe University
• Principal Investigator: Hidema Ruri 神戸大学, 工学研究科, 准教授 (20598172)
• Co-Investigator(Kenkyū-buntansha): 鈴木 洋 神戸大学, 工学研究科, 教授 (90206524)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 高分子の形態 / 流動抵抗 / マイクロレオロジー

Outline of Final Research Achievements

To quantify polymer-fluid and polymer-polymer interactions in a flow, this study measured drag force of polymers by combining a flow channel and a scanning probe microscope (SPM). A cantilever probe where polymers were attached by a covalent bonding was held by the SPM. The cantilever probe was immersed in a flow, and therefore, polymers were subjected to the flow. The drag force of polymers in the flow was measured by the SPM. The force was compared to the drag force calculated by assuming a polymer conformation model proposed in this study; both values were very close. The proposed model was applicable for several kinds of polymers with different molecular weights.

Free Research Field

複雑流体のレオロジー

Academic Significance and Societal Importance of the Research Achievements

本研究は，工業的に用いられているにも関わらず学術的背景が明らかでない乱流抑制，弾性不安定，潤滑など，低濃度高分子溶液が示す複雑な流動挙動の原因を，高分子と流体の相互作用の直接的な計測により明らかにすることを目指した．高分子の流体中の形態を予測し，流動抵抗の実測値と比較した例はこれまでになかったが，この技術は生体高分子解析の発展にも貢献できる．このように，本研究は学術的，社会的な意義がある．