Thermal diffusivity modulation driven by the interfacial elastic dynamics between cellulose nanofibers

Uetani, Kojiro; Izakura, Shogo; Koga, Hirotaka et al.

Nanoscale Advances, 2020, 2(3), 1024-1030

Number of Access:756（2025-08-14 12:35 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/78449

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Title
Thermal diffusivity modulation driven by the interfacial elastic dynamics between cellulose nanofibers
Creator
NRID
1000020733306 1000020733306
CreatorName
Uetani, Kojiro
CreatorName
Izakura, Shogo
NRID
1000030634539 1000030634539
ORCID
0000-0001-6295-1731 0000-0001-6295-1731
researchmap permalink
hkoga hkoga
Scopus Author ID
7201439917 7201439917
CreatorName
Koga, Hirotaka
NRID
1000080379031 1000080379031
researchmap permalink
read0151141 read0151141
Scopus Author ID
9846851200 9846851200
CreatorName
Nogi, Masaya
Description
K. Uetani, S. Izakura, H. Koga and M. Nogi. Thermal diffusivity modulation driven by the interfacial elastic dynamics between cellulose nanofibers Nanoscale Adv., 2020, 2, 1024. https://doi.org/10.1039/C9NA00734B.
Abstract
Thermal transport modulating materials show great potential to address the heat problems in a wide range of engineering fields. However, tuning the thermal conductivity of solid-state materials is practically difficult because it requires specific or extreme stimulation, such as chemical composition change, a phase transition, or large applied fluctuations, to change the internal bulk structures. Here, we report reversible switching of the in-plane thermal diffusivity of densely packed cellulose nanofiber (CNF) films by ∼15% by simple mechanical strain as small as 0.3%. From analysis of the stress relaxation profiles and the different bulk densities of the CNF films, the interfacial elastic dynamics between the strongly hydrogen bonded CNFs were found to exhibit thermal diffusivity modulation by tuning the interfacial thermal resistance, rather than changing the bulk structure of the CNFs. Our concept of interfacial-elasticity-driven thermal diffusivity switching has the potential to enhance the on/off rate and extensibility toward practical use owing to the high designability of the interfacial conditions.
Publisher
Royal Society of Chemistry
Source Title
Nanoscale Advances
Volume (Issue)
2(3)
Page
1024-1030
Date of Issued
2020
Language
English
Handle URL
https://hdl.handle.net/11094/78449
eISSN
25160230
Relation.isIdenticalTo
DOI (Publisher Version)
https://doi.org/10.1039/c9na00734b
Access Rights
open access
CopyRight
© 2020 The Royal Society of Chemistry. This article is licensed under a Creative Commons Attribution 3.0 Unported License.
oaire:version
Version of Record
Category
学術雑誌論文 Journal Article