Zhang Yu, Wang Jun, Wu Qilei, Shan Ting, Bai Shengjie, Lan Di, Zhang Bin, Liu Yaqing, Su Xiaogang
Key Laboratory of Functional Nanocomposites of Shanxi Province, School of Materials Science and Engineering, North University of China, Taiyuan 030051, China.
Science and Technology on Electromagnetic Compatibility Laboratory, China Ship Development and Design Centre, Wuhan 430070, China.
J Colloid Interface Sci. 2025 Jan 15;678(Pt A):648-655. doi: 10.1016/j.jcis.2024.08.211. Epub 2024 Aug 26.
Electromagnetic wave absorption materials (EWAMs) have become an effective means to address electromagnetic (EM) radiation and enhance stealth technology, among which aerogels are valued for their lightweight nature and excellent designability. This study utilized environmentally friendly preparation and in-situ reduction techniques to fabricate bacterial cellulose (BC) / reduced graphene oxide (RGO) aerogels, achieving tailored EM wave loss capabilities by controlling the reduction time of ascorbic acid. Benefitting from the effects of freeze-casting, BC winding, hydrogen bond, and RGO layers coupling, the aerogel maintains their original structure after reduction and exhibits satisfactory EM wave absorption. The minimum reflection loss (RL) is -38.52 dB, with an effective absorption bandwidth (EAB) of 6.68 GHz and a maximum radar cross section (RCS) reduction of 44.69 dBsm. Additionally, the aerogel's lightweight (a low density of 9.03 mg/cm) and outstanding thermal insulation properties enable it to adapt to complex conditions. Thus, the study provides a novel approach for the construction of industrialized and sustainable RGO-based EWAMs.
电磁波吸收材料（EWAMs）已成为解决电磁（EM）辐射和增强隐身技术的有效手段，其中气凝胶因其轻质特性和出色的可设计性而受到重视。本研究采用环保制备和原位还原技术制备细菌纤维素（BC）/还原氧化石墨烯（RGO）气凝胶，通过控制抗坏血酸的还原时间实现了定制的电磁波损耗能力。受益于冷冻铸造、BC缠绕、氢键和RGO层耦合的作用，气凝胶在还原后保持其原始结构，并表现出令人满意的电磁波吸收性能。最小反射损耗（RL）为-38.52 dB，有效吸收带宽（EAB）为6.68 GHz，最大雷达散射截面（RCS）降低44.69 dBsm。此外，气凝胶的轻质（低密度为9.03 mg/cm）和出色的隔热性能使其能够适应复杂条件。因此，该研究为构建工业化和可持续的基于RGO的EWAMs提供了一种新方法。
