Wang Xiaohan, Yuan Ye, Sun Xianxian, Qiang Ruo, Xu Yichao, Ma Yu, Zhang Enshuang, Li Yibin
School of Materials Science and Engineering, Beihang University, Beijing, 100191, P. R. China.
Tianmushan Laboratory, Xixi Octagon City, Yuhang District, Hangzhou, 310023, P. R. China.
Small. 2024 Jul;20(30):e2311657. doi: 10.1002/smll.202311657. Epub 2024 Mar 10.
A complex electromagnetic environment is a formidable challenge in national defense areas. Microwave-absorbing materials are considered as a strategy to tackle this challenge. In this work, lightweight, flexible, and thermal insulating Carbon/SiO@CNTs (CSC) aerogel is successfully prepared coupled with outstanding microwave absorbing performance, through freeze-drying and high-temperature annealing techniques. The CSC aerogel shows a strong reflection loss (-55.16 dB) as well as wide effective absorbing bandwidth (8.5 GHz) in 2-18 GHz. It also retains good microwave absorption properties under tension and compression. Radar cross-sectional (RCS) simulation result demonstrates the CSC processing a strong reduction ability of RCS compared with a metal plate. Further exploration shows amazing flexibility and good thermal insulation properties of CSC. The successful preparation of this composite aerogel provides a broad prospect for the design of microwave-absorbing materials.
复杂电磁环境在国防领域是一项严峻挑战。吸波材料被视为应对这一挑战的一种策略。在本工作中，通过冷冻干燥和高温退火技术，成功制备出了兼具轻质、柔性、隔热性能以及出色吸波性能的碳/二氧化硅@碳纳米管（CSC）气凝胶。CSC气凝胶在2-18GHz范围内显示出强烈的反射损耗（-55.16dB）以及宽有效吸收带宽（8.5GHz）。它在拉伸和压缩状态下也能保持良好的吸波性能。雷达散射截面（RCS）模拟结果表明，与金属板相比，CSC对RCS具有很强的降低能力。进一步探究显示出CSC具有惊人的柔韧性和良好的隔热性能。这种复合气凝胶的成功制备为吸波材料的设计提供了广阔前景。
