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Electromagnetic Absorbing Materials
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Electromagnetic Absorbing Materials

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

Deadline for manuscript submissions: closed (31 December 2021) | Viewed by 11944

Special Issue Editors

Prof. Dr. Pilar Marín

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Guest Editor
Departamento de Física de Materiales, Instituto de Magnetismo Aplicado, Universidad Complutense de Madrid, Nacional VI, Km 22,5, 28230 Las Rozas, Spain
Interests: amorphous magnetic materials; nanocrystalline magnetic materials; radara absorbing materials; magnetic sensors
Prof. Dr. Elena Navarro

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Guest Editor
1. Instituto de Magnetismo Aplicado, Universidad Complutense de Madrid, Madrid, Spain
2. Departamento de Física de Materiales, Facultad de Físicas, Universidad Complutense de Madrid, Madrid, Spain
Interests: nanomagnetism; magnetic nanoparticles; nanowires; thin films; heterostructures and composites
Special Issues, Collections and Topics in MDPI journals
Dr. Jesús López

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Guest Editor
Departamento de Física de Materiales, Instituto de Magnetismo Aplicado, Universidad Complutense de Madrid, Nacional VI, Km 22,5, 28230 Las Rozas, Spain
Interests: magnetic nanopaticles; sol-gel technique; radar absorbing materials

Special Issue Information

Dear Colleagues,

Electromagnetic absorbent materials, in particular microwave attenuating materials (MAMs), have been the subject of many studies in recent years. This fact is due to the proliferation of electronic devices working in the GHz range, both for mobile communications and for the control of devices in the field of medicine, transport or for military purposes. The origin of the attenuation should be sought both in dielectric and magnetic losses as well as in the combination of both. It is worth pointing out that, not only the strong absorption performance, but also lightweight should be considered for MAMs’ practical application.

The challenge of these investigations is to obtain maximum attenuation with materials as light in weight as possible. There are interesting studies carried out with micro- and magnetic nanomaterials embedded in dielectric matrices. In some cases, very good results are obtained by combining these materials with carbon nanotubes or graphene derivatives.

This Special Issue will focus on the latest developments, research findings, and applications of electromagnetic absorbent materials.

Both reviews and original research papers will be considered. Reviews should provide an up-to-date, well-balanced overview of the current state-of-the-art of a particular material or materials combination and include the main results from other groups.

Prof. Dr. Pilar Marín
Prof. Dr. Elena Navarro
Dr. Jesús López
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • electromagnetic waves absorbing material
  • nanomaterials
  • composites

Published Papers (5 papers)

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Research

12 pages, 4542 KiB  
Article
Double-Sided Metasurface Array for a Dual-Band and Polarization-Independent Microwave-Energy-Harvesting System
by Maged A. Aldhaeebi and Thamer S. Almoneef
Materials 2021, 14(21), 6242; https://0-doi-org.brum.beds.ac.uk/10.3390/ma14216242 - 20 Oct 2021
Cited by 5 | Viewed by 1546
Abstract
In this article, we present a simple and novel design of a double-sided metasurface for a dual-band and polarization-independent microwave-energy-harvesting system. The proposed metasurface is constructed from the dual-sided design of 8 × 8 unit cells. Different from the regular dual-band unit cells [...] Read more.
In this article, we present a simple and novel design of a double-sided metasurface for a dual-band and polarization-independent microwave-energy-harvesting system. The proposed metasurface is constructed from the dual-sided design of 8 × 8 unit cells. Different from the regular dual-band unit cells that contain two loops or multiple shapes of resonators printed in the same layer, the proposed metasurface is based on designing double loops, each combined with two arms of a dipole printed on the top and bottom sides of a single substrate. Thus, the bottom layer is utilized to generate the second frequency band of interest. Three main numerical simulations were conducted to investigate the performance of a single unit cell, a 2 × 2 supercell, and an array of an 8 × 8 metasurface structure. The numerical simulation demonstrated that 98% and 95% of the incident energy is collected at two bands of 1.8 and 6.5 GHz for the proposed harvester. Full article
(This article belongs to the Special Issue Electromagnetic Absorbing Materials)
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15 pages, 14494 KiB  
Article
Effect of Solvothermal Reaction-Time on Microstructure and Microwave Absorption Properties of Cobalt Ferrite
by Yue Yuan, Shicheng Wei, Yi Liang, Bo Wang and Yujiang Wang
Materials 2020, 13(23), 5331; https://0-doi-org.brum.beds.ac.uk/10.3390/ma13235331 - 25 Nov 2020
Cited by 14 | Viewed by 1964
Abstract
Cobalt ferrite is synthesized via a simple solvothermal method. Then, the effect of the degree of cobalt-ferrite growth on its morphology, structure, electromagnetic performance, and microwave absorption is studied as a function of the solvothermal reaction time. When the reaction time during synthesis [...] Read more.
Cobalt ferrite is synthesized via a simple solvothermal method. Then, the effect of the degree of cobalt-ferrite growth on its morphology, structure, electromagnetic performance, and microwave absorption is studied as a function of the solvothermal reaction time. When the reaction time during synthesis is 8 h, the structure of cobalt ferrite is hollow spheres. In addition, when the reaction time is 12 h and 16 h, it becomes a submicron sphere with a diameter of 100–150 nm. With the increase of reaction time, cobalt ferrite underwent the process of cobalt ferrite formation, hollow structure formation, hollow structure disappearance, agglomeration separation and reagglomeration in 4–16 h. In general, CoFe2O4-8h shows better microwave absorption-the effective absorption bandwidth is 9.84 GHz (6–15.84 GHz) for a thickness of 1.72–3.72 mm. This represents a minimum return loss of −47.24 dB. A better understanding of both the synthesis parameters and the relationship between structure and electromagnetic properties can open new possibilities for applications and the development of microwave absorbing materials. Full article
(This article belongs to the Special Issue Electromagnetic Absorbing Materials)
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15 pages, 6375 KiB  
Article
Microwave Absorption Properties of Magnetite Particles Extracted from Nickel Slag
by Pengze Yan, Yongqian Shen, Xueyan Du and Junkai Chong
Materials 2020, 13(9), 2162; https://0-doi-org.brum.beds.ac.uk/10.3390/ma13092162 - 07 May 2020
Cited by 12 | Viewed by 2203
Abstract
The utilization of nickel slag has attracted much attention due to its high-content of valuable elements. As a part of these efforts, this work focuses on whether magnetite crystals, obtained from nickel slag via molten oxidation, magnetic separation, and ball-milling can be used [...] Read more.
The utilization of nickel slag has attracted much attention due to its high-content of valuable elements. As a part of these efforts, this work focuses on whether magnetite crystals, obtained from nickel slag via molten oxidation, magnetic separation, and ball-milling can be used as a microwave absorber. The composition, morphology, microstructure, magnetic properties, and microwave absorption performance were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), vibrating sample magnetometer (VSM), and vector network analysis (VNA). The results reveal that the magnetite crystals exhibit excellent microwave absorption properties because of the synergistic action between dielectric loss and magnetic loss. The minimum reflection loss (RL) of the particles obtained after 6 h ball-milling reaches −34.0 dB at 16.72 GHz with thickness of 5 mm. The effective frequency bandwidth (RL ≤ −10 dB) is 4.8–5.4 GHz and 15.9–17.6 GHz. Interfacial polarization of the particles could play a crucial role in improving absorbing properties because several components contained in the particles can dissipate electromagnetic wave effectively. The current study could show great potential in the preparation of magnetite crystals and utilization of nickel slag. Full article
(This article belongs to the Special Issue Electromagnetic Absorbing Materials)
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12 pages, 8147 KiB  
Article
Effect of Ball Milling on the Absorption Properties of Fe3O4
by Yi Liang, Yue Yuan, Yuwei Huang, Yujiang Wang, Shicheng Wei, Bo Wang, Wei Huang, Wei Xin and Xinlei Wang
Materials 2020, 13(4), 883; https://0-doi-org.brum.beds.ac.uk/10.3390/ma13040883 - 17 Feb 2020
Cited by 11 | Viewed by 1886
Abstract
FeCl3∙6H2O was used as raw material to produce Fe3O4, using the solvothermal method with ethylene glycol as the solvent. Fe3O4, with different particle sizes, was obtained via mechanical ball-milling by controlling [...] Read more.
FeCl3∙6H2O was used as raw material to produce Fe3O4, using the solvothermal method with ethylene glycol as the solvent. Fe3O4, with different particle sizes, was obtained via mechanical ball-milling by controlling the milling time. Effect of the milling time on the structure, morphology, and electromagnetic parameters of Fe3O4 were studied, and the absorption properties and mechanism of Fe3O4, for different milling times were analyzed. The results showed that the integrity of the original small spherical structure decreased as the ball milling time increased. Fe3O4 showed excellent microwave absorptions as the milling time reached 2 h, the reflection loss reached the maximum of −21.19 dB at 4.64 GHz as the thickness was 6.55 mm. Full article
(This article belongs to the Special Issue Electromagnetic Absorbing Materials)
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18 pages, 6632 KiB  
Article
Carbon Fiber and Nickel Coated Carbon Fiber–Silica Aerogel Nanocomposite as Low-Frequency Microwave Absorbing Materials
by Agnieszka Ślosarczyk, Łukasz Klapiszewski, Tomasz Buchwald, Piotr Krawczyk, Łukasz Kolanowski and Grzegorz Lota
Materials 2020, 13(2), 400; https://0-doi-org.brum.beds.ac.uk/10.3390/ma13020400 - 15 Jan 2020
Cited by 16 | Viewed by 3556
Abstract
Silica aerogel-based materials exhibit a great potential for application in many industrial applications due to their unique porous structure. In the framework of this study, carbon fiber and nickel coated carbon fiber–silica aerogel nanocomposites were proposed as effective electromagnetic shielding material. Herein, the [...] Read more.
Silica aerogel-based materials exhibit a great potential for application in many industrial applications due to their unique porous structure. In the framework of this study, carbon fiber and nickel coated carbon fiber–silica aerogel nanocomposites were proposed as effective electromagnetic shielding material. Herein, the initial oxidation of the surface of carbon fibers allowed the deposition of a durable Ni metallic nanolayer. The fibers prepared in this way were then introduced into a silica aerogel structure, which resulted in obtaining two nanocomposites that differed in terms of fiber volume content (10% and 15%). In addition, analogous systems containing fibers without a metallic nanolayer were studied. The conducted research indicated that carbon fibers with a Ni nanolayer present in the silica aerogel structure negatively affected the structural properties of the composite, but were characterized by two-times higher electrical conductivity of the composite. This was because the nickel nanolayer effectively blocked the binding of the fiber surface to the silica skeleton, which resulted in an increase of the density of the composite and a reduction in the specific surface area. The thermal stability of the material also deteriorated. Nevertheless, a very high electromagnetic radiation absorption capacity between 40 and 56 dB in the frequency range from 8 to 18 GHz was obtained. Full article
(This article belongs to the Special Issue Electromagnetic Absorbing Materials)
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