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Sustainable chitosan derived 3D hierarchically porous carbon aerogel toward advanced infrared-radar compatibility
Carbon ( IF 10.5 ) Pub Date : 2024-05-05 , DOI: 10.1016/j.carbon.2024.119213
Luo Zhentao , Weihua Gu , Jinghua He , Laifa Shen , Guangbin Ji

Simultaneously achieving infrared-radar compatibility in one material is an important challenge for multi-spectral compatible stealth technology. Chitosan-derived three-dimensional (3D) hierarchically porous carbon aerogel can effectively solve the problem. Inspired by floors-pillars concept, this work elaborately designed and successfully fabricated 3D skeletons consisted of two-dimensional (2D) sheets and one-dimensional (1D) struts. Benefiting from esterification and directional freeze drying method, the entire network could provide sufficient space for reducing thermal conductivity and motivating dipole polarization sites. Thanks to the facile calcination process, conductive components could be obtained, which guarantee low infrared (IR) emissivity and high conduction loss performance. In this work, the as-prepared carbon aerogel with ultra-low density of 0.005 g cm exhibits superb infrared stealth property. It shows a low thermal conductivity coefficient of only 0.0933 W m K. In addition, the heating rate of the upper surface is slow when placed on a heating platform of 60 °C. The relevant IR emissivity value is as low as 0.563 in 3–5 μm band and 0.432 in 8–14 μm band. Under relatively thin thicknesses, the prominent radar stealth performance including the optimum reflection loss value of −75.90 dB, the maximum effective bandwidth of 3.93 GHz, and the simulated radar cross section reduction value of 27.66 dB m, can be obtained. This study not only introduces innovative design ideas but also offers technical approaches, facilitating further development in the realm of infrared-radar compatible stealth.

中文翻译:


可持续的壳聚糖衍生的 3D 分层多孔碳气凝胶可实现先进的红外雷达兼容性



在一种材料中同时实现红外雷达兼容性是多光谱兼容隐形技术的一个重要挑战。壳聚糖衍生的三维(3D)分层多孔碳气凝胶可以有效解决这个问题。受地板-支柱概念的启发,这项工作精心设计并成功制造了由二维 (2D) 板材和一维 (1D) 支柱组成的 3D 骨架。受益于酯化和定向冷冻干燥方法,整个网络可以为降低热导率和激发偶极子极化位点提供足够的空间。由于简化的煅烧过程,可以获得导电部件,从而保证低红外(IR)发射率和高传导损耗性能。在这项工作中,所制备的碳气凝胶具有0.005 g cm的超低密度,表现出优异的红外隐身性能。它表现出较低的导热系数,仅为0.0933 W m K。此外,当放置在60°C的加热平台上时,上表面的加热速率很慢。相关红外发射率值在 3–5 μm 波段低至 0.563,在 8–14 μm 波段低至 0.432。在较薄的厚度下,可以获得突出的雷达隐身性能,最佳反射损耗值为-75.90 dB,最大有效带宽为3.93 GHz,模拟雷达截面减少值为27.66 dB m。这项研究不仅介绍了创新的设计思想,还提供了技术途径,有助于红外雷达兼容隐身领域的进一步发展。
更新日期:2024-05-05
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