Enhancing electromagnetic shielding property and absorption coefficients via constructing electromagnetic rings in janus composites

Hou, Xin; Feng, Xue-Rong; Jiang, Ke; Zheng, Yu-Chen; Liu, Jiang-Tao; Wang, Ming

doi:10.1016/j.compscitech.2024.110809

Composites Science and Technology

2024

DOI: 10.1016/j.compscitech.2024.110809

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Enhancing electromagnetic shielding property and absorption coefficients via constructing electromagnetic rings in janus composites

Xin Hou,

Xue-Rong Feng,

Ke Jiang

et al.

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Cited by 11 publications

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Electromagnetic shielding property and electrical conductivity of multi‐walled carbon nanotubes filled poly(ε‐caprolactone) composites with dense conductive networks: A simulation and experimental study

Zheng,

Jiang,

Hou

et al. 2024

Polymer Composites

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Electromagnetic shielding properties of conductive polymer composites (CPCs) are dependent on the content of conductive fillers. In this study, electromagnetic shielding effectiveness (EMW SE) of poly(ε‐caprolactone) (PCL) filled with different content of multi‐walled carbon nanotubes (MWCNTs) were prepared to systematically discuss content‐dependent electromagnetic shielding mechanism via a simulation and experimental study. At low MWCNT loadings, the composites have high absorption coefficients because the MWCNT particles are separated by PCL chains. The shielding performance mainly comes from the polarization loss and conduction loss. However, the composites with high content of MWCNT can form conductive networks which leads to high reflection values, suggesting a reflection‐dominant shielding mechanism. In addition, a conductive mesh model is first introduced to simulate the effect of filler loadings on electromagnetic shielding performance. For electrical conductivity, there is no obvious platform being found in the samples at a high content of MWCNTs. The formation of a denser conductive network within the composites reduces inter‐filler gaps and promotes closer contact. However, according to the experimental and simulation results, upon exceeding the percolation threshold of MWCNT loadings, the EM SE value slightly increases leading to a plateau region. The results are ascribed to the formation of stable shielding networks at high content of MWCNTs.Highlights The sample has a high absorption coefficient at a low content of MWCNTs. All the samples exhibit a reflection‐dominant shielding mechanism. No obvious platform of conductivity is found at high content of MWCNTs. Obvious platform of EMW SE values is found in the high content of MWCNTs. High EMW SE values for CPC only require relatively dense conductive networks.

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Electromagnetic shielding property and electrical conductivity of multi‐walled carbon nanotubes filled poly(ε‐caprolactone) composites with dense conductive networks: A simulation and experimental study

Zheng,

Jiang,

Hou

et al. 2024

Polymer Composites

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The design‐manufacturing‐evaluation integration of a bionic stealth metastructure inspired by the weevils back shell structure

Huang,

Zhao,

Sun

et al. 2024

Polymer Composites

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With the advancement of technology, the demand for high‐performance stealth materials with complex structures has increased significantly. This study explores the integration of design, manufacturing, and evaluation of stealth structures using fused deposition modeling (FDM) combined with advanced absorbing materials. Focusing on nylon‐based filaments optimized for broadband absorption, the research is inspired by the microstructure of the weaver ant's back shell to create a thin‐layer, wideband absorbing structure with wide‐angle response, employing the trust region algorithm. This integration of high dielectric loss materials, bionic design, and FDM technology enhances manufacturing efficiency and reduces the structure's thickness. The resulting structure achieves broadband absorption from 3.56 to 40 GHz, excellent angular adaptability, and mechanical robustness. Compared to gradient cell structures, it reduces thickness by 33% and extends the absorption frequency range by 5%. This approach offers a lightweight, high‐performance solution for next‐generation stealth applications.Highlights Biomimetic inspired design‐manufacturing‐evaluation integration. Trust domain algorithm optimization. Improve absorption by combining the macro structure and micro materials. Additive manufacturing cross‐enabled functional material design.

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3D-printed sodium alginate/carbon nanotube/graphene porous scaffolds crosslinked with Ca2+ for high-performance electromagnetic shielding and Joule heating

Dai,

Ren,

Deng

et al. 2024

Carbohydrate Polymers

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Enhancing electromagnetic shielding property and absorption coefficients via constructing electromagnetic rings in janus composites

Cited by 11 publications

References 54 publications

Electromagnetic shielding property and electrical conductivity of multi‐walled carbon nanotubes filled poly(ε‐caprolactone) composites with dense conductive networks: A simulation and experimental study

Electromagnetic shielding property and electrical conductivity of multi‐walled carbon nanotubes filled poly(ε‐caprolactone) composites with dense conductive networks: A simulation and experimental study

The design‐manufacturing‐evaluation integration of a bionic stealth metastructure inspired by the weevils back shell structure

3D-printed sodium alginate/carbon nanotube/graphene porous scaffolds crosslinked with Ca2+ for high-performance electromagnetic shielding and Joule heating

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