文献类型：期刊文献

英文题名：Dynamically Tunable Electromagnetic Shielding Performance Based on Humidity-Responsive PVA Foam/Gel Composites

作者：Wu, Bozhen[1]; Shi, Zhongpu[2]; Song, Yanghua[2]; Song, Xuejiao[2]; Wu, Peng[2]; Meng, Yongkang[2]; Zhang, Shijie[2]; Zhang, Hanghang[2]; Zhou, Dong[3]; Li, Yulin[3]

机构：[1] School of Biological & Chemical Engineering, Zhejiang University of Science and Technology, Hangzhou, 310023, China; [2] College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou, 310014, China; [3] The Key Laboratory for Ultrafine Materials of Ministry of Education, Engineering Research Centre for Biomedical Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai, 200237, China

年份：2026

外文期刊名：Journal of Industrial and Engineering Chemistry

收录：EI(收录号：20261920649068)

语种：英文

外文关键词：Composite coatings - Electromagnetic shielding - Electromagnetic wave interference - Impedance matching (electric) - Magnetic materials - Magnetic shielding - Metal foams - Signal interference

摘要：Environmental humidity, as a readily variable external stimulus, offers a promising avenue for dynamically regulating electromagnetic interference (EMI) shielding performance, yet its effective utilization in lightweight and flexible materials remains limited. Herein, a lightweight and multifunctional intelligent composite foam was designed by incorporating bimetallic metal-organic framework (MOF)-derived magnetic porous carbon into a poly(vinyl alcohol) (PVA) foam framework, followed by an immersion-based coating of a silver nanowire-filled PVA gel on both the internal and external surfaces. The hierarchical porous foam/gel structure and synergistic magnetic-conductive components improve impedance matching and enhance interfacial polarization, enabling absorption-dominated EMI shielding. The composite achieves a total shielding effectiveness of 40.43 dB in the X band, with an absorption coefficient of 0.595, while maintaining 94.77% of its initial shielding performance after 1000 compression cycles. Benefiting from the humidity sensitivity of the PVA gel coating, the shielding effectiveness increases from 20.14 dB in the dry state to 28.34 dB in the humid state, corresponding to an improvement of 40.7%, while the absorption coefficient rises from 0.34 to 0.77.These results demonstrate a foam/gel composite with humidity-switchable and performance-enhanced absorption-type EMI shielding, offering a viable strategy for next-generation flexible, lightweight, and dynamically adaptive green EMI shielding materials. ? 2026 The Korean Society of Industrial and Engineering Chemistry.