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Thermal Conductivity Analysis of Chitin and Deacetylated-Chitin Nanofiber Films under Dry Conditions

1
Graduate School of Engineering, Osaka University, Mihogaoka 8-1, Ibaraki-shi, Osaka 567-0047, Japan
2
The Institute of Scientific and Industrial Research (SANKEN), Osaka University, Mihogaoka 8-1, Ibaraki-shi, Osaka 567-0047, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Luis Morellón
Nanomaterials 2021, 11(3), 658; https://doi.org/10.3390/nano11030658
Received: 21 February 2021 / Revised: 5 March 2021 / Accepted: 5 March 2021 / Published: 8 March 2021
(This article belongs to the Special Issue Emerging Functions of Nano-Organized Polysaccharides)
Chitin, a natural polysaccharide polymer, forms highly crystalline nanofibers and is expected to have sophisticated engineering applications. In particular, for development of next-generation heat-transfer and heat-insulating materials, analysis of the thermal conductivity is important, but the thermal conductivity properties of chitin nanofiber materials have not been reported. The thermal conductivity properties of chitin nanofiber materials are difficult to elucidate without excluding the effect of adsorbed water and analyzing the influence of surface amino groups. In this study, we aimed to accurately evaluate the thermal conductivity properties of chitin nanofiber films by changing the content of surface amino groups and measuring the thermal diffusivity under dry conditions. Chitin and deacetylated-chitin nanofiber films with surface deacetylation of 5.8% and 25.1% showed in-plane thermal conductivity of 0.82 and 0.73 W/mK, respectively. Taking into account that the films had similar crystalline structures and almost the same moisture contents, the difference in the thermal conductivity was concluded to only depend on the amino group content on the fiber surfaces. Our methodology for measuring the thermal diffusivity under conditioned humidity will pave the way for more accurate analysis of the thermal conductivity performance of hydrophilic materials. View Full-Text
Keywords: chitin nanofiber; deacetylated chitin; nanopaper; thermal diffusivity chitin nanofiber; deacetylated chitin; nanopaper; thermal diffusivity
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MDPI and ACS Style

Wang, J.; Kasuya, K.; Koga, H.; Nogi, M.; Uetani, K. Thermal Conductivity Analysis of Chitin and Deacetylated-Chitin Nanofiber Films under Dry Conditions. Nanomaterials 2021, 11, 658. https://doi.org/10.3390/nano11030658

AMA Style

Wang J, Kasuya K, Koga H, Nogi M, Uetani K. Thermal Conductivity Analysis of Chitin and Deacetylated-Chitin Nanofiber Films under Dry Conditions. Nanomaterials. 2021; 11(3):658. https://doi.org/10.3390/nano11030658

Chicago/Turabian Style

Wang, Jiahao, Keitaro Kasuya, Hirotaka Koga, Masaya Nogi, and Kojiro Uetani. 2021. "Thermal Conductivity Analysis of Chitin and Deacetylated-Chitin Nanofiber Films under Dry Conditions" Nanomaterials 11, no. 3: 658. https://doi.org/10.3390/nano11030658

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