An investigation into instantaneously tuning the EMI shielding characteristics of CNT-based nanocomposite biofoams in the X-band range by strain loading

IF 3.4 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Mechanics of Materials Pub Date : 2025-02-01 DOI:10.1016/j.mechmat.2024.105209

Xiaodong Xia , Yang Liu , Shilin Huang , Jianyang Luo , George J. Weng

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Abstract

The electromagnetic interference (EMI) shielding of CNT-based nanocomposite biofoams is capable of being tailored instantaneously by mechanical loading. In contrast to tuning the EMI shielding via nanofillers or by decoration process, the strain-activated EMI tailoring characteristics possess enormous potential that still await to be explored. To reveal this tailoring mechanism, a multi-scale electro-magneto-mechanically coupled homogenization model is developed to tailor the EMI characteristics of CNT-based nanocomposite biofoams in the X-band range (8.2–12.4 GHz). In this development, the elastic moduli, complex conductivity, and complex permeability are all selected as the homogenization variables. Four categories of interface effects are considered, including imperfect interface bonding, electron tunneling, Maxwell-Wagner-Sillars polarization, and electron hopping. The predicted EMI tailoring characteristics are validated by the experiment of CNT/wheat flour nanocomposite biofoam over a wide range of stain loading. The effective EMI shielding behavior decreases with the compressive loading, but it increases with the tensile loading. It is found that a CNT content higher than the percolation threshold is necessary to tailor the EMI shielding behavior of this nanocomposite foam via strain loading. This study can provide innovative insights to tune the EMI shielding characteristics of CNT-based nanocomposite biofoams in X-band instantaneously.

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应变加载对碳纳米管基纳米复合生物泡沫x波段电磁干扰屏蔽特性的瞬时调节研究

碳纳米管基纳米复合生物泡沫材料的电磁干扰屏蔽性能可以通过机械加载瞬间定制。与通过纳米填料或装饰工艺来调整电磁干扰屏蔽相比，应变激活的电磁干扰剪裁特性具有巨大的潜力，仍有待探索。为了揭示这种裁剪机制，建立了一个多尺度电磁-机械耦合均匀化模型，以定制基于碳纳米管的纳米复合生物泡沫在x波段范围（8.2-12.4 GHz）的电磁干扰特性。采用弹性模量、复电导率和复渗透率作为均匀化变量。考虑了四类界面效应，包括不完全界面成键、电子隧穿、麦克斯韦-瓦格纳-西拉极化和电子跳变。通过碳纳米管/小麦粉纳米复合生物泡沫在大范围染色负荷下的实验，验证了预测的电磁干扰裁剪特性。有效电磁干扰屏蔽性能随压缩载荷的增大而减小，随拉伸载荷的增大而增大。研究发现，当碳纳米管含量高于渗透阈值时，可通过应变加载调整该纳米复合材料泡沫的电磁干扰屏蔽行为。该研究可为实时调整碳纳米管基纳米复合生物泡沫的x波段电磁干扰屏蔽特性提供创新见解。

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来源期刊

Mechanics of Materials 工程技术-材料科学：综合

CiteScore

7.60

自引率

5.10%

发文量

243

审稿时长

46 days

期刊介绍： Mechanics of Materials is a forum for original scientific research on the flow, fracture, and general constitutive behavior of geophysical, geotechnical and technological materials, with balanced coverage of advanced technological and natural materials, with balanced coverage of theoretical, experimental, and field investigations. Of special concern are macroscopic predictions based on microscopic models, identification of microscopic structures from limited overall macroscopic data, experimental and field results that lead to fundamental understanding of the behavior of materials, and coordinated experimental and analytical investigations that culminate in theories with predictive quality.