Journal
ACS NANO
Volume 13, Issue 2, Pages 2236-2245Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.8b08913
Keywords
infrared stealth; Kevlar nanofibers; aerogel; free-standing films; phase-change materials; thermal management
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Funding
- National Natural Science Foundation of China [51572285]
- National Key Research and Development Program of China [2016YFA0203301]
- Royal Society Newton Advanced Fellowship [NA170184]
- Natural Science Foundation of Jiangsu Province [BK20170428]
- China Postdoctoral Science Foundation [2018M642352]
- Jingsu Planned Projects for Postdoctoral Research Funds [2018K070C]
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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.
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