材料科学
电磁屏蔽
干扰(通信)
复合材料
电磁干扰
电磁干扰
吸收(声学)
金属
电磁辐射
导电体
传导电磁干扰
光电子学
光学
电子工程
电气工程
冶金
工程类
频道(广播)
物理
作者
Xin Zhang,Jianbin Tang,Yun Zhong,Yujia Feng,Xinpeng Wei,Mengyao Li,Jian Wang
标识
DOI:10.1016/j.colsurfa.2022.128781
摘要
Conductive polymer composites (CPCs) with high conductivity components designed based on impedance mismatch strategy have high electromagnetic interference shielding effectiveness (EMI SE) yet cause serious secondary pollution due to their strong reflection. A well-designed double-layer fiber-based waterborne polyurethane (WPU) composite with electro-magnetic asymmetric distribution for EMI shielding with absorption-dominant is realized. When the electromagnetic waves (EMWs) enter the [email protected]/Cu/Fe3O4/WPU composite through gaps of the nonwoven fabric, incoming microwaves will undergo a special 'absorption-reflection-reabsorption' process between the metal microtubules, and the electromagnetic shielding effectiveness (EMI SE) of the composite reaches 55.8 dB in X-band, which indicates approximately 99.9997% of EWMs are attenuated in the propagation process. Herein, absorption (SEA, 50.1 dB) contributes 89.8% to the total SE and the lowest power coefficient of reflection (R) reaches 0.62. This work expands the application field of high-performance aramid fibers, and provides a reliable strategy to reduce secondary electromagnetic radiation pollution.
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