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(qū)化學(xué)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(fā)兼具可見光/紅外偽裝及信息加密的高導(dǎo)熱復(fù)合材料對于促進(jìn)5G通訊技術(shù)在軍事方面的應(yīng)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(zhì)結(jié)構(gòu)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(jié)構(gòu)(BNNS/ANF)-(AgNWs@BNNS)-(BNNS/ANF)（BAB）導(dǎo)熱絕緣復(fù)合膜。當(dāng)AgNWs@BNNS和BNNS的質(zhì)量比為1:1且總質(zhì)量分?jǐn)?shù)為50 wt%時(shí)，BAB導(dǎo)熱復(fù)合膜具有優(yōu)異的面內(nèi)導(dǎo)熱系數(shù)（λ∥，10.36 W/(m·K)）、電絕緣性能（擊穿強(qiáng)度和體積電阻率分別為41.5 kV/mm和1.21×1015Ω·cm）和力學(xué)性能（拉伸強(qiáng)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(shí)的平衡溫度較直接使用純ANF的CPU溫度低7.0oC。同時(shí)，BAB導(dǎo)熱復(fù)合膜具備在水泥路面及叢林環(huán)境中的自適應(yīng)可見光/紅外雙重偽裝特性以及24 s內(nèi)二維碼信息快速加密功能。
論文亮點(diǎn)
1. 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(jié)構(gòu)(BNNS/ANF)-(AgNWs@BNNS)-(BNNS/ANF)（BAB）導(dǎo)熱絕緣復(fù)合膜。2. 當(dāng)AgNWs@BNNS和BNNS的質(zhì)量比為1:1且總質(zhì)量分?jǐn)?shù)為50 wt%時(shí)，BAB導(dǎo)熱復(fù)合膜具有優(yōu)異的面內(nèi)導(dǎo)熱系數(shù)（λ∥，10.36 W/(m·K)）、電絕緣性能（擊穿強(qiáng)度和體積電阻率分別為41.5 kV/mm和1.21×1015 Ω·cm）和力學(xué)性能（拉伸強(qiáng)度為170.9 MPa）。3.BAB復(fù)合膜具備在水泥路面及叢林環(huán)境中的自適應(yīng)可見光/紅外雙重偽裝特性以及24 s內(nèi)二維碼快速加密功能。
點(diǎn)擊查看更多詳情