期刊
NANO LETTERS
卷 22, 期 21, 页码 8406-8412出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.2c02057
关键词
Nanocellulose; filament; flow focusing; thermal conductivity; crystallinity
类别
资金
- JSPS KAKENHI
- JST CREST
- [19K21928]
- [22H04950]
- [JPMJCR21O2]
This study demonstrates that nanocellulose materials can exhibit high thermal conductivity when their nanofibrils are highly aligned and bonded. The crystallinity of the filaments significantly influences their thermal conductivity.
Nanocellulose is regarded as a green and renewable nanomaterial that has attracted increased attention. In this study, we demonstrate that nanocellulose materials can exhibit high thermal conductivity when their nanofibrils are highly aligned and bonded in the form of filaments. The thermal conductivity of individual filaments, consisting of highly aligned cellulose nanofibrils, fabricated by the flow-focusing method is measured in dried condition using a T-type measurement technique. The maximum thermal conductivity of the nanocellulose filaments obtained is 14.5 W/m-K, which is approximately five times higher than those of cellulose nanopaper and cellulose nanocrystals. Structural investigations suggest that the crystallinity of the filament remarkably influence their thermal conductivity. Smaller diameter filaments with higher crystallinity, that is, more internanofibril hydrogen bonds and less intrananofibril disorder, tend to have higher thermal conductivity. Temperature-dependence measurements also reveal that the filaments exhibit phonon transport at effective dimension between 2D and 3D.
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