具有定向微通道的可控制介电常数的CNTs/PI复合气凝胶用于高级微波吸收和热隔离

IF 11.6 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Carbon Pub Date : 2024-12-02 DOI:10.1016/j.carbon.2024.119883

Hao Wu , Xiaohu Ren , Wanxin Hu , Yun Tang , Hongfeng Yin , Huiqing Fan , Hudie Yuan , Chao Wang , Yalou Xin

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引用次数: 0

摘要

聚合物基气凝胶已被证明是一种很有前途的选择，可以获得高性能和轻质的电磁微波（EMW）吸收材料。本研究采用定向冷冻干燥法制备了具有定向微通道结构的多功能超轻CNTs/PI复合气凝胶。独特的定向孔隙结构使入射EMW在材料内部发生多次反射和散射，有利于EMW能量的衰减。通过改变复合气凝胶中CNTs的含量，可以有效调节复合气凝胶的偶极极化和界面极化。当CNTs含量为30%，厚度为2.5 mm时，在15.36 GHz处的反射损耗最小（RLmin）为−41 dB。在厚度为3 mm处获得了6.88 GHz的有效吸收带宽（EAB）。此外，CNTs/PI复合气凝胶具有优异的韧性、热隔离性和热稳定性。本研究提出的耐高温、轻质复合气凝胶为开发先进的多功能吸波材料提供了一条可行而有效的途径。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Permittivity controllable CNTs/PI composite aerogels with oriented microchannels for advanced microwave absorption and thermal isolation

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Permittivity controllable CNTs/PI composite aerogels with oriented microchannels for advanced microwave absorption and thermal isolation

Polymer-based aerogels have proven to be a promising choice to obtain high-performance and lightweight materials for electromagnetic microwave (EMW) absorption. Here, directional freeze-drying was used to produce multifunctional ultralight CNTs/PI composite aerogels with oriented microchannel structures. The unique oriented pore structure causes the multiple reflections and scattering of incident EMW inside the material, which favors the attenuation of the EM energy. By changing the CNTs content in the composite aerogels, the dipole polarization and the interface polarization can be effectively regulated. With a CNTs content of 30 % and a thickness of 2.5 mm, the minimum reflection loss (RL_min) of −41 dB was achieved at 15.36 GHz. A large effective absorption bandwidth (EAB) of 6.88 GHz was achieved at a thickness of 3 mm. In addition, the CNTs/PI composite aerogels displayed excellent toughness, thermal isolation and the thermal stability. The high-temperature resistant, lightweight composite aerogels proposed in this study could provide a feasible and effective approach for the development of advanced multifunctional microwave-absorbing materials.

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来源期刊

Carbon 工程技术-材料科学：综合

CiteScore

20.80

自引率

7.30%

发文量

审稿时长

23 days

期刊介绍： The journal Carbon is an international multidisciplinary forum for communicating scientific advances in the field of carbon materials. It reports new findings related to the formation, structure, properties, behaviors, and technological applications of carbons. Carbons are a broad class of ordered or disordered solid phases composed primarily of elemental carbon, including but not limited to carbon black, carbon fibers and filaments, carbon nanotubes, diamond and diamond-like carbon, fullerenes, glassy carbon, graphite, graphene, graphene-oxide, porous carbons, pyrolytic carbon, and other sp2 and non-sp2 hybridized carbon systems. Carbon is the companion title to the open access journal Carbon Trends. Relevant application areas for carbon materials include biology and medicine, catalysis, electronic, optoelectronic, spintronic, high-frequency, and photonic devices, energy storage and conversion systems, environmental applications and water treatment, smart materials and systems, and structural and thermal applications.