Magnetochemistry

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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

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Keywords

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

Published Papers (2 papers)

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Research

16 pages, 2553 KiB

Open AccessArticle

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 36 | Viewed by 1717

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 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

Open AccessArticle

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 3 | Viewed by 1270

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 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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