Yixin Han, Kunpeng Ruan, Xiaoyu He, Yusheng Tang, Hua Guo, Yongqiang Guo*, Hua Qiu, Junwei Gu*. Highly Thermally Conductive Aramid Nanofiber Composite Films with Synchronous Visible/Infrared Camouflages and Information Encryption. Angewandte Chemie International Edition, 2024, 10.1002/anie.202401538. 2022IF=16.6.（1区化学Top期刊）

https://onlinelibrary.wiley.com/doi/10.1002/anie.202401538

Abstract

The development of highly thermally conductive composites that combine visible light/infrared camouflage and information encryption has been endowed with great significance in facilitating the application of 5G communication technology in military fields. This work uses aramid nanofibers (ANF) as the matrix, hetero-structured silver nanowires@boron nitride nanosheets (AgNWs@BNNS) prepared by in-situ growth as fillers, which are combined to fabricate sandwich structured thermally conductive and electrically insulating (BNNS/ANF)-(AgNWs@BNNS)-(BNNS/ANF) (denoted as BAB) composite films by “filtration self-assembly, air spraying, and hot-pressing” method. When the mass ratio of AgNWs@BNNS to BNNS is 1:1 and the total mass fraction is 50 wt%, BAB composite film has the maximum in-plane thermal conductivity coefficient (λ∥ of 10.36 W/(m·K)), excellent electrical insulation (breakdown strength and volume resistivity of 41.5 kV/mm and 1.21×1015 Ω·cm, respectively) and mechanical properties (tensile strength of 170.9 MPa). 50 wt% BAB composite film could efficiently reduce the equilibrium temperature of the central processing unit (CPU) working at full power, resulting in 7.0oC lower than that of the CPU solely integrated with ANF directly. In addition, BAB composite film boasts adaptive visible light/infrared dual camouflage properties on cement roads and jungle environments, as well as the function of fast encryption of QR code information within 24 seconds.

研发兼具可见光/红外伪装及信息加密的高导热复合材料对于促进5G通讯技术在军事方面的应用意义重大。本文以芳纶纳米纤维（ANF）为基体，以原位生长法制备的异质结构银纳米线@氮化硼纳米片（AgNWs@BNNS）为填料，采用抽滤自组装-空气喷涂-热压工艺制备了上下层为BNNS/ANF、中间层为AgNWs@BNNS的三明治结构(BNNS/ANF)-(AgNWs@BNNS)-(BNNS/ANF)（BAB）导热绝缘复合膜。当AgNWs@BNNS和BNNS的质量比为1:1且总质量分数为50 wt%时，BAB导热复合膜具有优异的面内导热系数（λ∥，10.36 W/(m·K)）、电绝缘性能（击穿强度和体积电阻率分别为41.5 kV/mm和1.21×1015Ω·cm）和力学性能（拉伸强度为170.9 MPa）。将其用作笔记本电脑中央处理器（CPU），可使CPU在满功率工作时的平衡温度较直接使用纯ANF的CPU温度低7.0oC。同时，BAB导热复合膜具备在水泥路面及丛林环境中的自适应可见光/红外双重伪装特性以及24 s内二维码信息快速加密功能。

论文亮点

1. 采用抽滤自组装-空气喷涂-热压工艺制备了上下层为BNNS/ANF、中间层为AgNWs@BNNS的三明治结构(BNNS/ANF)-(AgNWs@BNNS)-(BNNS/ANF)（BAB）导热绝缘复合膜。2. 当AgNWs@BNNS和BNNS的质量比为1:1且总质量分数为50 wt%时，BAB导热复合膜具有优异的面内导热系数（λ∥，10.36 W/(m·K)）、电绝缘性能（击穿强度和体积电阻率分别为41.5 kV/mm和1.21×1015 Ω·cm）和力学性能（拉伸强度为170.9 MPa）。3.BAB复合膜具备在水泥路面及丛林环境中的自适应可见光/红外双重伪装特性以及24 s内二维码快速加密功能。

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