Thermal diffusivity measurement of polymer microfibers while eliminating the effect of heat radiation

The thermal transport properties of polymer fibers are important for heat dissipation in apparel, matrix of wearable devices, and so on. However, it is difficult to precisely determine the thermal properties of a single polymer fiber because of non-negligible thermal radiation due to its relatively...

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Bibliographic Details
Published in:Applied physics letters 2024-10, Vol.125 (18)
Main Authors: Hamasaki, Hiromu, Mochizuki, Takumi, Shibata, Ryosuke, Suzuki, Hayate, Ikeda, Hiroya
Format: Article
Language:English
Subjects:
Diffusivity
Microfibers
Polymers
Silk
Thermal conductivity
Thermal diffusivity
Thermal radiation
Thermodynamic properties
Transport properties
Wearable technology
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Summary:The thermal transport properties of polymer fibers are important for heat dissipation in apparel, matrix of wearable devices, and so on. However, it is difficult to precisely determine the thermal properties of a single polymer fiber because of non-negligible thermal radiation due to its relatively low thermal conductivity and high surface-area-to-volume ratio. Here, we developed a system in which the apparent thermal diffusivity and size of microfibers can be measured to estimate their intrinsic thermal diffusivity. We determined the thermal diffusivities of three fibrous materials: silk, spider silk, and cellulose microfibers to be 4.2 (±0.8)×10−7, 1.8 (±0.7)×10−7, and 4.7 (±0.5)×10−7, respectively. For all fibers, the apparent thermal diffusivity strongly depended on the fiber size, indicating that eliminating the radiation effect is indispensable for determining the thermal transport properties of polymer microfibers.
ISSN:0003-6951
1077-3118
DOI:10.1063/5.0238642