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Research Article | Open Access

Enhancing the thermal conductivity of nanofibrillated cellulose films with 1D BN belts formed by in-situ generation and sintering of BN nanosheets

Baokai Wanga,†, Zheng Zhaoa,†, Mengyi Lia, Mengyang Niua, Jialu Tiana, Chang Yua, Shiqin Wana, Ming Yueb, Weiwei Xuanc, Wenbin Caoa, Zhaobo Tiand( ), Kexin Chene( ), Qi Wanga( )
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China
School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China
School of Microelectronics, Southern University of Science and Technology, Shenzhen 518055, China
State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China

† Baokai Wang and Zheng Zhao contributed equally to this work.

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Abstract

The rapid miniaturization and high integration of modern electronic devices have brought an increasing demand for polymer-based thermal management materials with higher thermal conductivity. Boron nitride nanosheets (BNNs) have been widely used as thermally conductive fillers benefiting from the extremely high intrinsic thermal conductivity. However, the small lateral size and weak interface bonding of BNNs enabled them to only form thermally conductive networks through physical overlap, resulting in high interfacial thermal resistance. To address this issue, an innovative strategy based on interface engineering was proposed in this study. High-aspect-ratio boron nitride belts (BNbs) were successfully synthesized by carbon thermal reduction nitridation method through the in-situ generation and sintering of BNNs. The surface of BNb showed the sintering of numerous smaller-sized BNNs, which precisely addresses the issue of weak interfacial bonding between BNNs. On this basis, the as-synthesized BNbs were combined with nano-fibrillated cellulose (NFC) to prepare NFC/BNb composite films through a facile vacuum filtration process. Due to the thermally conductive network formed by the horizontal oriented arrangement of BNb and their particular morphological advantages, the NFC/BNb films demonstrated significantly higher in-plane thermal conductivity than that of NFC/BNNs films, achieving the highest value of 19.119 W·m−1·K−1 at a 20 wt% filling fraction. In addition, the NFC/BNb films also exhibited superior thermal stability, mechanical strength, flexibility, and electrical insulation performance, suggesting the significant application potential of the designed BNb fillers in the thermal management field.

Keywords

boron nitride (BN)thermal management materialsvacuum filtrationflexible thermally conductive films

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Journal of Advanced Ceramics
Volume 12 Issue 12,
December 2023
Pages 2257-2270
DOI: 10.26599/JAC.2023.9220817
Cite this article:
Wang B, Zhao Z, Li M, et al. Enhancing the thermal conductivity of nanofibrillated cellulose films with 1D BN belts formed by in-situ generation and sintering of BN nanosheets. Journal of Advanced Ceramics, 2023, 12(12): 2257-2270. https://doi.org/10.26599/JAC.2023.9220817

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Received: 08 August 2023
Revised: 04 October 2023
Accepted: 05 October 2023
Published: 04 January 2024
© The Author(s) 2023.

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