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Magnetochemistry
Special Issues
Electromagnetic Microwave Absorption and Electromagnetic Interference Shielding
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Electromagnetic Microwave Absorption and Electromagnetic Interference Shielding

A special issue of Magnetochemistry (ISSN 2312-7481). This special issue belongs to the section "Applications of Magnetism and Magnetic Materials".

Deadline for manuscript submissions: closed (28 February 2023) | Viewed by 5535

Special Issue Editor

Prof. Dr. Xiaojun Zeng

E-Mail Website
Guest Editor
School of Materials Science and Engineering, Jingdezhen Ceramic University, Jingdezhen 333403, China
Interests: electromagnetic microwave absorption
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Today, electromagnetic microwaves (EMWs) are becoming an unignorable concern. EMW radiation brings about many problems of electronic device interference and electromagnetic environmental pollution, which makes the development of EMW absorption and electromagnetic interference (EMI) shielding a general trend. Developing EMW absorption and EMI shielding materials with thin thickness, light weight, and flexibility is the aim pursued by researchers. The defined size, shape, and morphology of nanomaterials play a significant role in EMW absorption and EMI shielding properties.

Although nanostructured materials deliver abundant absorption and shielding sites, limited impedance matching and conductivity in bulk form significantly hinder their efficiency for absorption and shielding effectiveness in practical implementation. Therefore, the engineering of nanostructured materials with tailored morphologies, phases, dimensions, defects, and interfaces is crucial to enlarge a specific surface area, enrich absorption and shielding sites, improve electronic conductivity, extend EMW absorption and EMI shielding paths, and ultimately enhance their ability to transform electromagnetic energy into heat.

This Special Issue aims to focus on the recent advances in the fine-tuning and structural engineering of nanostructures, and proposes the importance of novel fabrication strategies to realize controlled structures (size, shape, and morphology) and to develop various engineering designs to improve their EMW absorption and EMI shielding performance, while revealing mechanisms for their performance enhancement.

Dr. Xiaojun Zeng
Guest Editor

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. Magnetochemistry is an international peer-reviewed open access monthly 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 2200 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

  • EMW absorption
  • EMI shielding
  • fine-tuning
  • structural engineering
  • impedance match-ing

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Published Papers (2 papers)

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16 pages, 2553 KiB  
Article
Synthesis and Characterization of Composites with Y-Hexaferrites for Electromagnetic Interference Shielding Applications
by Sajjad Ahmad Khan, Irshad Ali, Abid Hussain, Hafiz Muhammad Asif Javed, Vitalii A. Turchenko, Alex V. Trukhanov and Sergei V. Trukhanov
Magnetochemistry 2022, 8(12), 186; https://doi.org/10.3390/magnetochemistry8120186 - 12 Dec 2022
Cited by 74 | Viewed by 2917
Abstract
The current research is focused on the chemical process and characterization of Co-based Y-type hexaferrite, electrochemically active polypyrrole doped with dodecylbenzene sulphonicacid (PPy-DBSA) and their composites. The microemulsion technique was used to produce hexaferrite with the formula Sr2Co2Fe12 [...] Read more.
The current research is focused on the chemical process and characterization of Co-based Y-type hexaferrite, electrochemically active polypyrrole doped with dodecylbenzene sulphonicacid (PPy-DBSA) and their composites. The microemulsion technique was used to produce hexaferrite with the formula Sr2Co2Fe12O22. The resistivity of pure ferrite specimens was 103 ohm-cm, which was lower than the 106 ohm-cm resistivity of the monomer utilized in the polymerization operation. As the temperature increases, the DC resistance decreases, revealing the specimens’ semiconductor nature. The cole-cole plots have been used to assess whether significant grain boundaries were involved in the dielectric relaxation process. By increasing the frequency, the electrochemical performance of all specimens was enhanced. Using the rate equation, ionic conductivity demonstrates that polarons are responsible for conduction. Because of the characteristics of the polymer PPY-conducting DBSA, the composites PPY/DBSA + Sr2Co2Fe12O22 exhibit a higher dielectric loss of 35 at 1 MHz. This specimen is perfect for electrical radiation shielding (EMI).These ferrites are widely used as permanent magnets, in microwave devices, high-density perpendicular media, and rigid disk media without lubricant and protective layers. Full article
(This article belongs to the Special Issue Electromagnetic Microwave Absorption and Electromagnetic Interference Shielding)
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11 pages, 4843 KiB  
Article
PAN—Composite Electrospun-Fibers Decorated with Magnetite Nanoparticles
by Zulkhair Mansurov, Gaukhar Smagulova, Bayan Kaidar, Aigerim Imash and Aidos Lesbayev
Magnetochemistry 2022, 8(11), 160; https://doi.org/10.3390/magnetochemistry8110160 - 21 Nov 2022
Cited by 5 | Viewed by 2054
Abstract
The results of the synthesis of PAN(polyacrylonitrile)-magnetite composite fibers using the electrospinning method are presented. The electrospinning installation included a rotating drum collector for collecting fibers. Magnetite nanoparticles were synthesized using chemical condensation from an iron chloride solution. It was shown that homogeneous [...] Read more.
The results of the synthesis of PAN(polyacrylonitrile)-magnetite composite fibers using the electrospinning method are presented. The electrospinning installation included a rotating drum collector for collecting fibers. Magnetite nanoparticles were synthesized using chemical condensation from an iron chloride solution. It was shown that homogeneous Fe3O4 magnetite nanoparticles with particle sizes of 6–16 nm could be synthesized using this method. Magnetite nanoparticles were investigated using X-ray diffraction analyses and transmission electron microscopy. Based on magnetite nanoparticles, composite PAN/magnetite fibers were obtained through electrospinning. The obtained composite fibers were investigated using scanning electron microscopy, X-ray diffraction analyses, and elemental analyses. It was shown that the magnetite nanoparticles were uniformly distributed on the surface of the fibers. A comparison of PAN fibers without any added magnetite to PAN/magnetite fibers showed that the addition of magnetite led to a decrease in the value of the fiber diameter at the same polymer concentration and under the same electrospinning process conditions. Full article
(This article belongs to the Special Issue Electromagnetic Microwave Absorption and Electromagnetic Interference Shielding)
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