Thermal switching with ultra-lightweight nano-carbon materials

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K05058
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 26040:Structural materials and functional materials-related
• Research Institution: Nagoya University
• Principal Investigator: UENO TOMONAGA 名古屋大学, 工学研究科, 助教 (20611156)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 熱マネジメント / 熱スイッチング材料 / カーボンナノチューブ / 超軽量材料

Outline of Final Research Achievements

We have created thermal management materials that can reversibly change thermal conductivity by using materials that elastically shrink and recover under compressive loading and unloading. A carbon nanotube-based material with a density of less than 10 mg/cm3 was fabricated by compositing it with polymeric materials. Surface treatment was applied to hydrophobize the material surface to increase the recovery rate of shrinkage and restoration. The thermal conductivities of these materials were evaluated to obtain a heat-transfer material in which solid heat transfer is dominant during compression and an insulating material in which gaseous heat transfer is dominant during unloading.

Free Research Field

材料工学

Academic Significance and Societal Importance of the Research Achievements

本研究は、伝熱を制御するための新たな熱マネジメント材料を提案するものであり、熱マネジメントが重要とされる電気自動車や家電製品などへの活用が期待される。学術的には、弾性回復する材料を得るための作製指針の獲得や、弾性回復を阻害していた要因を特定できたことに学術的位置がある。また、圧縮負荷および除荷時の材料の熱伝導率を評価し、各状態において支配的な伝熱形態を明かにすることができ、学術的な進展が見られた。