[Angewandte Chemie International Edition] Highly Thermally Conductive Aramid Nanofiber Composite Films with Synchronous Visible/Infrared Camouflages and Information Encryption
writer：Yixin Han, Kunpeng Ruan, Xiaoyu He, Yusheng Tang, Hua Guo, Yongqiang Guo*, Hua Qiu, Junwei Gu*
keywords：thermally conductive
source：期刊
specific source：Angewandte Chemie International Edition
Issue time：2024年
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區化學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.
研發兼具可見光/紅外偽裝及信息加密的高導熱復合材料對于促進5G通訊技術在軍事方面的應用意義重大。本文以芳綸納米纖維（ANF）為基體，以原位生長法制備的異質結構銀納米線@氮化硼納米片（AgNWs@BNNS）為填料，采用抽濾自組裝-空氣噴涂-熱壓工藝制備了上下層為BNNS/ANF、中間層為AgNWs@BNNS的三明治結構(BNNS/ANF)-(AgNWs@BNNS)-(BNNS/ANF)（BAB）導熱絕緣復合膜。當AgNWs@BNNS和BNNS的質量比為1:1且總質量分數為50 wt%時，BAB導熱復合膜具有優異的面內導熱系數（λ∥，10.36 W/(m·K)）、電絕緣性能（擊穿強度和體積電阻率分別為41.5 kV/mm和1.21×1015Ω·cm）和力學性能（拉伸強度為170.9 MPa）。將其用作筆記本電腦中央處理器（CPU），可使CPU在滿功率工作時的平衡溫度較直接使用純ANF的CPU溫度低7.0oC。同時，BAB導熱復合膜具備在水泥路面及叢林環境中的自適應可見光/紅外雙重偽裝特性以及24 s內二維碼信息快速加密功能。