Nanofibrous Kevlar Aerogel Films and Their Phase-Change Composites for Highly Efficient Infrared Stealth,ACS Nano

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Nanofibrous Kevlar Aerogel Films and Their Phase-Change Composites for Highly Efficient Infrared Stealth
ACS Nano ( IF 15.8 ) Pub Date : 2019-01-30 00:00:00 , DOI: 10.1021/acsnano.8b08913
Jing Lyu ₁ , Zengwei Liu ₁ , Xiaohan Wu ₁ , Guangyong Li ₁ , Dan Fang ₁ , Xuetong Zhang _{1,

2}

Affiliation

Infrared (IR) stealth is essential not only in high technology and modern military but also in fundamental material science. However, effectively hiding targets and rendering them invisible to thermal infrared detectors have been great challenges in past decades. Herein, flexible, foldable, and robust Kevlar nanofiber aerogel (KNA) films with high porosity and specific surface area were fabricated first. The KNA films display excellent thermal insulation performance and can be employed to incorporate with phase-change materials (PCMs), such as polyethylene glycol, to fabricate KNA/PCM composite films. The KNA/PCM films with high thermal management capability and infrared emissivity comparable to that of various backgrounds demonstrate high performance in IR stealth in outdoor environments with solar illumination variations. To further realize hiding hot targets from IR detection, combined structures constituted of thermal insulation layers (KNA films) and ultralow IR transmittance layers (KNA/PCM) are proposed. A hot target covered with this combined structure becomes completely invisible in infrared images. Such KNA/PCM films and KNA–KNA/PCM combined structures hold great promise for broad applications in infrared thermal stealth.

中文翻译：

纳米纤维凯夫拉尔气凝胶薄膜及其相变复合材料，可实现高效的红外隐身

红外（IR）隐身不仅在高科技和现代军事中至关重要，而且在基础材料科学中也至关重要。然而，在过去的几十年中，有效地隐藏目标并使它们对热红外探测器不可见一直是巨大的挑战。在此，首先制造具有高孔隙率和比表面积的柔性，可折叠且坚固的凯夫拉尔纳米纤维气凝胶（KNA）薄膜。KNA膜显示出极好的绝热性能，可与诸如聚乙二醇的相变材料（PCM）结合使用，以制造KNA / PCM复合膜。具有与各种背景相当的高热管理能力和红外发射率的KNA / PCM膜，在户外环境中，随着太阳照度的变化，在红外隐身方面表现出很高的性能。为了进一步实现对热目标的红外检测隐藏，提出了由隔热层（KNA膜）和超低红外透射率层（KNA / PCM）构成的组合结构。覆盖有这种组合结构的热目标在红外图像中变得完全不可见。此类KNA / PCM薄膜和KNA-KNA / PCM组合结构在红外热隐身领域具有广阔的应用前景。

更新日期：2019-01-30

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