利用超延展性凯夫拉衍生胶体定制具有高电磁屏蔽性能的芳纶纳米纤维气凝胶,Advanced Materials Technologies

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利用超延展性凯夫拉衍生胶体定制具有高电磁屏蔽性能的芳纶纳米纤维气凝胶
Advanced Materials Technologies ( IF 6.4 ) Pub Date : 2023-07-07 , DOI: 10.1002/admt.202300548
Zongwen Zhang _{1,

2} , Chunhui Wang _{1,

2} , Yuanping Luo ₁ , Changxin Yuan _{1,

2} , Wanbiao Hu _{1,

2}

Affiliation

开发具有可定制结构、可定制性能、轻质和高效 EMI 屏蔽效能 (SE) 的高性能电磁干扰 (EMI) 屏蔽材料非常重要但具有挑战性。在此，提出了一种简便的方法，通过超延展性的 ANF 果冻，定制具有预先设计结构的基于芳纶纳米纤维 (ANF) 的 EMI 屏蔽气凝胶。通过精确调节ANF之间的纤维间相互作用，构建坚固的3D骨架，ANF果冻可以像面团一样“揉捏-冷冻-加热”，生产出具有特殊结构的超轻、弹性和多孔的ANF气凝胶，如气凝胶夹层、弹簧、织物、等受益于互连的多孔结构，银纳米线（AgNW）等导电填料可以通过浸涂轻松覆盖气凝胶骨架，形成高导电路径。5.2 毫米厚的 AgNW/ANF 气凝胶采用超低负载量（7.5 wt.%）的 AgNW，在 X 波段表现出 75.4 dB 的平均 EMI SE。可根据实际应用环境定制具有附加功能的气凝胶。定制的夹层气凝胶具有阻燃外层和EMI屏蔽夹层，可在高温环境下使用。柔性气凝胶织物作为EMI屏蔽垫片可以有效阻挡无线电力传输。这项工作为构建具有定制特性的高性能 EMI 屏蔽材料提供了前瞻性策略。2 毫米厚的 AgNW/ANF 气凝胶在 X 波段的平均 EMI SE 为 75.4 dB。可根据实际应用环境定制具有附加功能的气凝胶。定制的夹层气凝胶具有阻燃外层和EMI屏蔽夹层，可在高温环境下使用。柔性气凝胶织物作为EMI屏蔽垫片可以有效阻挡无线电力传输。这项工作为构建具有定制特性的高性能 EMI 屏蔽材料提供了前瞻性策略。2 毫米厚的 AgNW/ANF 气凝胶在 X 波段的平均 EMI SE 为 75.4 dB。可根据实际应用环境定制具有附加功能的气凝胶。定制的夹层气凝胶具有阻燃外层和EMI屏蔽夹层，可在高温环境下使用。柔性气凝胶织物作为EMI屏蔽垫片可以有效阻挡无线电力传输。这项工作为构建具有定制特性的高性能 EMI 屏蔽材料提供了前瞻性策略。柔性气凝胶织物作为EMI屏蔽垫片可以有效阻挡无线电力传输。这项工作为构建具有定制特性的高性能 EMI 屏蔽材料提供了前瞻性策略。柔性气凝胶织物作为EMI屏蔽垫片可以有效阻挡无线电力传输。这项工作为构建具有定制特性的高性能 EMI 屏蔽材料提供了前瞻性策略。

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Customize Aramid Nanofiber Aerogels with High Electromagnetic Shielding Performance from Ultra-Malleable Kevlar-Derived Jelly

It is important but challenging to develop high-performance electromagnetic interference (EMI) shielding materials with customizable structures, tailorable properties, light weight, and high-efficiency EMI shielding effectiveness (SE). Herein, a facile approach is proposed to customize aramid nanofiber (ANF) based EMI shielding aerogels with pre-designed architectures through ultra-malleable ANF jellies. By precisely regulating the interfiber interactions between ANF and constructing a robust 3D skeleton, ANF jelly can be ‘kneaded-frozen-heated’ like dough to produce ultralight, elastic and porous ANF aerogels with special structures, such as aerogel sandwich, spring, fabric, etc. Benefiting from the interconnected porous structure, conductive fillers such as silver nanowires (AgNW) can easily cover the aerogel skeleton by dip-coating to form highly conductive paths. With an ultra-low loading (7.5 wt.%) of AgNW, a 5.2 mm-thick AgNW/ANF aerogel exhibit an average EMI SE of 75.4 dB in the X-band. Aerogels with additional functions can be customized according to the actual application environment. A customized sandwich aerogel with fire-retardant outerlayer and EMI shielding interlayer can be used in high-temperature environments. A flexible aerogel fabric as an EMI shielding gasket can effectively block wireless power transmission. This work provides a forward-looking strategy for constructing high-performance EMI shielding materials with tailored properties.

更新日期：2023-07-07

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