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Open AccessArticle

Direct Measurement of Temperature Diffusivity of Nanocellulose-Doped Biodegradable Composite Films

1
CREST—JST and School of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1, Ookayama, Meguro-ku, Tokyo 152-8550, Japan
2
Reserarch Institute for Material and Chemical Measurement, National Metrology Institute of Japan (AIST), Tsukuba Central 3, 1-1-1 Umezono, Tsukuba 305-8563, Japan
3
Optical Sciences Centre and ARC Training Centre in Surface Engineering for Advanced Materials (SEAM), School of Science, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
4
School of Science, RMIT University, Melbourne, VIC 3000, Australia
5
Department of Physics, Electrical and Computer Engineering, Graduate School of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan
6
Institute of Advanced Sciences, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan
7
World Research Hub Initiative (WRHI), School of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1, Ookayama, Meguro-ku, Tokyo 152-8550, Japan
*
Authors to whom correspondence should be addressed.
Micromachines 2020, 11(8), 738; https://doi.org/10.3390/mi11080738
Received: 16 July 2020 / Revised: 27 July 2020 / Accepted: 28 July 2020 / Published: 29 July 2020
(This article belongs to the Special Issue Micro/Nano-surfaces: Fabrication and Applications)
The thermal properties of novel nanomaterials play a significant role in determining the performance of the material in technological applications. Herein, direct measurement of the temperature diffusivity of nanocellulose-doped starch–polyurethane nanocomposite films was carried out by the micro-contact method. Polymer films containing up to 2 wt%. of nanocellulose were synthesised by a simple chemical process and are biodegradable. Films of a high optical transmittance T80% (for a 200 μm thick film), which were up to 44% crystalline, were characterised. Two different modalities of temperature diffusivity based on (1) a resistance change and (2) micro-thermocouple detected voltage modulation caused by the heat wave, were used for the polymer films with cross sections of ∼100 μm thickness. Twice different in-plane α and out-of-plane α temperature diffusivities were directly determined with high fidelity: α=2.12×107 m2/s and α=1.13×107 m2/s. This work provides an example of a direct contact measurement of thermal properties of nanocellulose composite biodegradable polymer films. The thermal diffusivity, which is usually high in strongly interconnected networks and crystals, was investigated for the first time in this polymer nanocomposite. View Full-Text
Keywords: thermal properties; temperature diffusivity; nano cellulose thermal properties; temperature diffusivity; nano cellulose
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MDPI and ACS Style

Fujisawa, H.; Ryu, M.; Lundgaard, S.; Linklater, D.P.; Ivanova, E.P.; Nishijima, Y.; Juodkazis, S.; Morikawa, J. Direct Measurement of Temperature Diffusivity of Nanocellulose-Doped Biodegradable Composite Films. Micromachines 2020, 11, 738. https://doi.org/10.3390/mi11080738

AMA Style

Fujisawa H, Ryu M, Lundgaard S, Linklater DP, Ivanova EP, Nishijima Y, Juodkazis S, Morikawa J. Direct Measurement of Temperature Diffusivity of Nanocellulose-Doped Biodegradable Composite Films. Micromachines. 2020; 11(8):738. https://doi.org/10.3390/mi11080738

Chicago/Turabian Style

Fujisawa, Hiroki; Ryu, Meguya; Lundgaard, Stefan; Linklater, Denver P.; Ivanova, Elena P.; Nishijima, Yoshiaki; Juodkazis, Saulius; Morikawa, Junko. 2020. "Direct Measurement of Temperature Diffusivity of Nanocellulose-Doped Biodegradable Composite Films" Micromachines 11, no. 8: 738. https://doi.org/10.3390/mi11080738

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