Liquid dynamics in ionic liquid based nanofluids

2022 Fiscal Year Final Research Report

• Project/Area Number: 19K12632
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 80040:Quantum beam science-related
• Research Institution: Fukuoka University
• Principal Investigator: Yoshida Koji 福岡大学, 理学部, 准教授 (00309890)
• Project Period (FY): 2019-04-01 – 2023-03-31
• Keywords: ナノ流体 / 液体 / 中性子散乱 / X線散乱 / ダイナミクス

Outline of Final Research Achievements

Nanofluids, in which a few volume percent of nanoparticles are dispersed in various liquids, such as an ionic liquid, are attracting attention as a new heat transport medium. X-ray and neutron scattering, and NMR measurements were performed to clarify the cause of the high thermal conductivity of nanofluids in terms of the motion of the liquid that constitutes the nanofluid. By using different techniques, the dynamics of liquid molecules were observed over a wide time scale, and the translational and rotational motions of liquid molecules were revealed. The experimental results show that liquid molecules on the nanoparticle surface are slowed down in motion by their interaction with the nanoparticles. This information can verify the result of nanofluids by computer simulations. We can control the properties of nanofluids by molecular design in the future.

Free Research Field

溶液化学

Academic Significance and Societal Importance of the Research Achievements

熱エネルギーの輸送は熱マネージメントにおいて重要であり、エネルギーの有効利用のためには高効率な熱輸送媒体の開発は必要不可欠となっている。ナノ流体は純液体に比べて熱伝導率が高いことが報告されており、新しい熱輸送媒体として期待されている。本研究では、ナノ流体を構成する液体のダイナミクスを幅広い時間スケールで観測した。その結果、ナノ粒子表面での液体分子はナノ粒子との相互作用で運動が遅くなっていることが明らかになった。分子間相互作用の観点から液体の構造や運動を調べることで、ナノ流体の物性の発現原理を明らかにし、物性の制御可能性を示した。