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2021 Fiscal Year Final Research Report

Investigation of thermal conductivity of DNA molecules and control of phonon transport by single molecule thermal conductivity measurement technique

Research Project

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Project/Area Number 19K21929
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 19:Fluid engineering, thermal engineering, and related fields
Research InstitutionThe University of Tokyo

Principal Investigator

Kodama Takashi  東京大学, 大学院工学系研究科(工学部), 特任准教授 (10548522)

Co-Investigator(Kenkyū-buntansha) 志賀 拓麿  東京大学, 大学院工学系研究科(工学部), 講師 (10730088)
Project Period (FY) 2019-06-28 – 2022-03-31
Keywordsナノスケール伝熱 / 一分子測定 / ナノ/マイクロ加工 / DNA / セルロースナノファイバー
Outline of Final Research Achievements

Biological molecules represented by DNA are a covalently-bonded pseudo-one-dimensional materials and are attracting attention for the thermal conduction properties because their sequences can be controlled at the molecular level. Here, we attempted to quantify the thermal conductivity of low thermal conductivity materials by using an ultrasensitive thermal measurement method that combines a microdevice method with a bridge circuit. Cellulose nanofibers derived from squirrels were selected as a first experimental sample due to the relatively long molecular length. As a result, the thermal conductivity of single fiber is about 2.2 W / m / K at room temperature and it shows a strong suppression of the thermal conductivity caused by the size effect. We could demonstrate the thermal conductivity measurement of a single bio-inspired single chain molecules for the first time. The established measurement technique will apply for the thermal conduction measurement of various biomaterials.

Free Research Field

熱工学

Academic Significance and Societal Importance of the Research Achievements

本研究はDNAに代表される生体材料の熱伝導性を単一分子レベルで明らかにし、生体材料の潜在性について明らかにすることを目的としている。DNAやたんぱく質などの生体由来の直鎖材料は、分子レベルで配列制御が可能な点からフォノンエンジニアリングにおいて極めて注目すべき材料であり、優れた熱伝導性や機械的性質を有している場合にはフレキシブル熱拡散材や断熱材などの工学応用も期待されている。しかし単一分子の熱伝導率測定の技術的障壁の高さから、これまで研究例は報告されておらず、本研究で実証したセルロースナノファイバー1本の熱伝導測定は、学術的、および工学的な観点から極めて意義の高い研究成果であるといえる。

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Published: 2023-01-30  

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