Structural design of compressible shape-memory foams for smart self-fixable electromagnetic shielding with reduced reflection

材料科学 电磁干扰 电磁屏蔽 电磁干扰 复合材料 反射(计算机编程) 电子工程 计算机科学 工程类 程序设计语言
作者
Guoqing Wang,Da Yi,Xichen Jia,Jiali Chen,Bin Shen,Wenge Zheng
出处
期刊:Materials Today Physics [Elsevier]
卷期号:22: 100612-100612 被引量:45
标识
DOI:10.1016/j.mtphys.2022.100612
摘要

To face the coexistence of the intended and unintended electromagnetic radiation in complex electromagnetic and harsh environment as well as minimize the secondary electromagnetic interference (EMI) pollution, the development of highly designable EMI shields for smart self-fixable EMI shielding with reduced reflection is of great importance. Herein, compressible shape-memory composite foams with strong structural designability have been fabricatd through a simple double dip-coating process, which could not only exhibit excellent shielding effectiveness (SE), but also achieve smart self-fixable SE adjustment under self-fixable compression originating from the ideal thermal/electrical-response shape-memory ability. More importantly, incorporating the concept of structural design, such as the construction of an asymmetric descending gradient structure or reasonable 3D patterns in the foams, could enhance the tunability of EM reflectivity effectively, which contributes to the reduction of EM reflection or even reverse the tendency of EM reflection to increase during the process of self-fixable compression-induced SE adjustment, thus minimizing the aggravated secondary EMI pollution significantly. The strategy and mechanism in this work highlights a significant plateau, on which smart self-fixable EMI shielding behavior with reduced reflection could be realized in highly designable shape-memory foam materials.
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