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

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Journal of Advanced Ceramics 2023年第12期12卷 2257-2270页

作者： Baokai Wang Zheng Zhao Mengyi Li Mengyang Niu Jialu Tian Chang Yu Shiqin Wan Ming Yue Weiwei Xuan Wenbin Cao Zhaobo Tian Kexin Chen Qi Wang School of materials Science and Engineering University of Science and Technology BeijingBeijing 100083China School of Civil and Resource Engineering University of Science and Technology BeijingBeijing 100083China School of Energy and Environmental Engineering University of Science and Technology BeijingBeijing 100083China School of Microelectronics Southern University of Science and TechnologyShenzhen 518055China State Key Laboratory for Advanced Metals and materials University of Science and Technology BeijingBeijing 100083China

The rapid miniaturization and high integration of modern electronic devices have brought an increasing demand for polymer-based thermal management materials with higher thermal *** nitride nanosheets(BNNs)have been widely used as thermally conductive fillers benefiting from the extremely high intrinsic thermal ***,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 *** address this issue,an innovative strategy based on interface engineering was proposed in this ***-aspect-ratio boron nitride belts(BNbs)were successfully synthesized by carbon thermal reduction nitridation method through the in-situ generation and sintering of *** surface of BNb showed the sintering of numerous smaller-sized BNNs,which precisely addresses the issue of weak interfacial bonding between *** this basis,the as-synthesized BNbs were combined with nano-fibrillated cellulose(NFC)to prepare NFC/BNb composite films through a facile vacuum filtration *** 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 *** 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.

关键词： boron nitride(BN) thermal management materials vacuum filtration flexible thermally conductive films

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Self-Modifying Nanointerface Driving Ultrahigh Bidirectional thermal Conductivity Boron Nitride-Based Composite Flexible Films

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Nano-Micro Letters 2023年第1期15卷 14-24页

作者： Taoqing Huang Xinyu Zhang Tian Wang Honggang Zhang Yongwei Li Hua Bao Min Chen Limin Wu Department of materials Science and State Key Laboratory of Molecular Engineering of Polymers Fudan UniversityShanghai 200433People’s Republic of China Department of Physics University of Michigan-Shanghai Jiao Tong University Joint InstituteShanghai Jiao Tong UniversityShanghai 200240People’s Republic of China Department of Chemistry Fudan UniversityShanghai 200433People’s Republic of China

While boron nitride(BN) is widely recognized as the most promising thermally conductive filler for rapidly developing high-power electronic devices due to its excellent thermal conductivity and dielectric properties,a great challenge is the poor vertical thermal conductivity when embedded in composites owing to the poor interracial interaction causing severe phonon ***,we report a novel surface modification strategy called the "self-modified nanointerface" using BN nanocrystals(BNNCs) to efficiently link the interface between BN and the polymer *** with ice-press assembly method,an only 25 wt% BNembedded composite film can not only possess an in-plane thermal conductivity of 20.3 W m-1K-1but also,more importantly,achieve a through-plane thermal conductivity as high as 21.3 W m-1K-1,which is more than twice the reported maximum due to the ideal phonon spectrum matching between BNNCs and BN fillers,the strong interaction between the self-modified fillers and polymer matrix,as well as ladder-structured BN *** excellent thermal conductivity has been verified by theoretical calculations and the heat dissipation of a *** study provides an innovative design principle to tailor composite interfaces and opens up a new path to develop high-performance composites.

关键词： thermal management materials Boron nitride thermal conductivity Interfacial thermal resistance

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