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

IF 10.5 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

Abstract

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.