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Electromagnetic Wave Absorbing Properties and Structures of Composites

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Advanced Composites".

Deadline for manuscript submissions: closed (20 January 2024) | Viewed by 1352

Special Issue Editors

School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
Interests: preparation and application of micro-nano energetic materials; preparation and application of electromagnetic wave absorption materials; catalysis for energetic materials
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Co-Guest Editor
College of Chemistry and Materials Engineering, Anhui Science and Technology University, Bengbu 233100, China
Interests: synthesis, design and absorbing properties of graphene based composites; synthesis and application of magnetic materials

Special Issue Information

Dear Colleagues,

Carbon-based composites are a kind of electromagnetic wave (EMW) absorption materials that have been widely studied. Additionally, the carbon components can be roughly divided into graphene, carbon fiber, carbon nanotubes, carbon black and other materials. Normally, a single carbon material tends to cause a "skin effect" due to its high electrical conductivity, which causes a large number of EMW to be reflected on the surface of the carbon material, resulting in negative EMW absorption properties. Based on this, surface modification treatment, compounding, structural design and other methods are often used to achieve impedance matching, thereby improving the EMW absorption performance of carbon materials. Among them, carbon-based composites are considered as potential candidates for high-performance EMW absorption due to its synergistic loss mechanism and diverse composition and microstructural designs. At present, the main challenge is to develop carbon-based composites that meet harsh conditions (such as high temperature resistance, corrosion resistance, etc.), facile preparation process, and high yield.

The purpose of this Special Issue is to provide an international platform for academic exchange on the design, preparation, characterization and application of carbon-based composites, thus promoting the development of carbon-based composites in the field of high-performance EMW absorption.

Dr. Gazi Hao
Dr. Yanping Wang
Guest Editors

Manuscript Submission Information

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Keywords

  • carbon-based composites
  • electromagnetic wave absorption
  • synergistic loss mechanism
  • high-performance

Published Papers (1 paper)

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Research

15 pages, 3266 KiB  
Article
Mechanical and Electromagnetic Wave Absorption Performance of Carbonyl Iron Powder-Modified Nonwoven Materials
by Wenyan Gu, Jiang Shi, Tianwen Pang, Qilong Sun, Qi Jia, Jiajia Hu and Jiaqiao Zhang
Materials 2023, 16(23), 7403; https://doi.org/10.3390/ma16237403 - 28 Nov 2023
Cited by 1 | Viewed by 923
Abstract
In order to develop carbonyl iron-enhanced electromagnetic wave-absorbing composites, this paper utilizes two different morphologies of carbonyl iron powder (CIP), spherical and flake-like, which are blended with aqueous polyurethane (PU) in three different ratios to prepare impregnating solutions. Polyester (PET) needle-punched nonwoven materials [...] Read more.
In order to develop carbonyl iron-enhanced electromagnetic wave-absorbing composites, this paper utilizes two different morphologies of carbonyl iron powder (CIP), spherical and flake-like, which are blended with aqueous polyurethane (PU) in three different ratios to prepare impregnating solutions. Polyester (PET) needle-punched nonwoven materials are impregnated with these solutions to produce electromagnetic wave-absorbing composites. First, electromagnetic parameters of the two CIP particle types, spherical carbonyl iron (SCIP) and flake-like carbonyl iron (FCIP), are tested with the coaxial method, followed by calculation of the results of their electromagnetic wave absorption performance. Next, the composites are subjected to microscopic morphology observation, tensile testing, and arched frame method electromagnetic wave absorption performance testing. The results indicate that the microwave absorption performance of FCIP is significantly better than that of SCIP. The minimum reflection loss value for F3, a kind of FCIP-modified nonwoven fabric, at the thickness of 1 mm, at 18 GHz is −17 dB. This value is even better than the calculated RL value of CIP at the thickness of 1 mm. The anisotropic shape of flake-like magnetic materials is further strengthened when adhering to the surface of PET fiber material. Additionally, the modified composites with carbonyl iron exhibit higher tensile strength compared with pure PET. The addition of fibrous skeletal materials is expected to enhance the impedance matching of flake-like magnetic particles, forming a wearable and microwave-absorbing composite. Full article
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