Advances in Carbon-Based Microwave Absorbing Materials

Du, Yunchen

doi:10.3390/ma15041359

Cited by 12 publications

(10 citation statements)

References 14 publications

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“…Absorbing material, a sort of electromagnetic (EM) shielding material, is thin coating with light weight. It has a strong absorbing performance ( Wen et al, 2014 ; Huang et al, 2021 ; Nuhiji et al, 2021 ; Du, 2022 ). Through magnetic loss, dielectric loss, or resistive loss, the absorbing material can reduce the EM field as required ( Zhang et al, 2020 ).…”

Section: Methodsmentioning

confidence: 99%

Design and evaluation of a rodent-specific focal transcranial magnetic stimulation coil with the custom shielding application in rats

Liu

Ding

et al. 2023

Front. Neurosci.

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Repetitive TMS has been used as an alternative treatment for various neurological disorders. However, most TMS mechanism studies in rodents have been based on the whole brain stimulation, the lack of rodent-specific focal TMS coils restricts the proper translation of human TMS protocols to animal models. In this study, we designed a new shielding device, which was made of high magnetic permeability material, to enhance the spatial focus of animal-use TMS coils. With the finite element method, we analyzed the electromagnetic field of the coil with and without the shielding device. Furthermore, to assess the shielding effect in rodents, we compared the c-fos expression, the ALFF and ReHo values in different groups following a 15 min 5 Hz rTMS paradigm. We found that a smaller focality with an identical core stimulation intensity was achieved in the shielding device. The 1 T magnetic field was reduced from 19.1 mm to 13 mm in diameter, and 7.5 to 5.6 mm in depth. However, the core magnetic field over 1.5 T was almost the same. Meanwhile, the area of electric field was reduced from 4.68 cm2 to 4.19 cm2, and 3.8 mm to 2.6 mm in depth. Similar to this biomimetic data, the c-fos expression, the ALFF and ReHo values showed more limited cortex activation with the use of the shielding device. However, compared to the rTMS group without the shielding application, more subcortical regions, like the striatum (CPu), the hippocampus, the thalamus, and the hypothalamus were also activated in the shielding group. This indicated that more deep stimulation may be achieved by the shielding device. Generally, compared with the commercial rodents’ TMS coil (15 mm in diameter), TMS coils with the shielding device achieved a better focality (~6 mm in diameter) by reducing at least 30% of the magnetic and electric field. This shielding device may provide a useful tool for further TMS studies in rodents, especially for more specific brain area stimulation.

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Section: Methodsmentioning

confidence: 99%

Design and evaluation of a rodent-specific focal transcranial magnetic stimulation coil with the custom shielding application in rats

Liu

Ding

et al. 2023

Front. Neurosci.

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“…To achieve excellent wave absorption materials, carbon-based and magnetic materials are often combined to produce a type of carbon-based magnetic composite MAMs, enabling dielectric loss and magnetic loss to work together to obtain stronger microwave attenuation ability, i.e., improving the electromagnetic parameters and impedance matching to obtain a wider absorption bandwidth. 129,130 For example, Zhao's team prepared a porous cocoon-shaped rGO with a high porosity (94.57%), of which the absorption performance Copyright 2019 Springer-Verlag. (d) Schematic illustration for the synthetic process of Ni@C microspheres.…”

Section: Carbon-based Magnetic Mamsmentioning

confidence: 99%

“…The MAM composed of a single carbon material or magnetic material might cause impedance mismatch, narrow absorption bandwidth, and other troublesome problems due to its single loss mechanism, leading to the relatively poor wave absorption performance. To achieve excellent wave absorption materials, carbon-based and magnetic materials are often combined to produce a type of carbon-based magnetic composite MAMs, enabling dielectric loss and magnetic loss to work together to obtain stronger microwave attenuation ability, i.e., improving the electromagnetic parameters and impedance matching to obtain a wider absorption bandwidth. , For example, Zhao’s team prepared a porous cocoon-shaped rGO with a high porosity (94.57%), of which the absorption performance was far better than that of other types of porous rGO. Based on this, they further prepared Fe–Co/NC/rGO composite by in situ growth method (Figure a). , The magnetic properties of Fe–Co/NC/rGO MAMs doped with Fe and Co were significantly improved, resulting in the enhancement of hysteresis loss (Figure b).…”

Section: Research Progresses Of Mamsmentioning

confidence: 99%

High-Performance Microwave Absorption Materials: Theory, Fabrication, and Functionalization

Zuo,

Jia,

et al. 2023

Ind. Eng. Chem. Res.

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The rapid development of 5G communication technology has led to serious electromagnetic wave pollution, and as a result, it is urgent to develop high-performance microwave absorption materials (MAMs) conducive to reducing electromagnetic pollution, which has great use in both the military and civilian fields. In this review article, we first introduce the absorption theory of microwave absorption materials. Then, the recent research progress in microwave absorption materials categorized as dielectric loss MAMs, magnetic loss MAMs, and electromagnetic synergistic loss MAMs are profoundly reviewed according to absorption mechanism. Subsequently, we proceed to review recent achievements in combining wave absorption with other functions including hydrophobicity, infrared stealth, and selfhealing, aiming at developing advanced multifunctional MAMs adapted to various extreme environments during practical applications. Finally, the challenges are presented, and prospects for potential opportunities in this rapidly blossoming field are discussed accordingly. We hope this critical review is timely, which could provide guidance for those who are committed to designing absorbers with better fundamental understanding and practical application.

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“…Electronics have facilitated the development of information technology, but they have also brought about non-negligible electromagnetic (EM) contamination. [1][2][3][4][5][6][7][8][9][10][11][12][13] EM pollution is not only harmful to DOI: 10.1002/adsu.202300272 our health. It also interferes with the normal operation of electronic instruments and equipment.…”

Section: Introductionmentioning

confidence: 99%

Structure Design, Surface Modification, and Application of CNT Microwave‐Absorbing Composites

Cai,

Yu,

Cheng

et al. 2023

Advanced Sustainable Systems

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Electromagnetic (EM) contamination has now become a non‐negligible problem. To solve the EM contamination problem, it is imperative to develop high‐efficiency absorption materials with thin thickness, light weight, strong absorption properties, and broad absorption bands. Carbon nanotubes (CNTs) have a special helical structure and chirality, which will lead to special EM effects and therefore can absorb EM microwaves through magnetic polarization attenuation such as hysteresis loss, domain wall resonance, and aftereffect loss. Moreover, they have the characteristics of light weight, good compatibility, wide absorption frequency band, and high electrical loss angle tangent. In this paper, the different structures of CNT microwave‐absorbing composites are reviewed and the effects of the composite structures on the microwave‐absorbing properties are systematically discussed. The methods and mechanisms of surface modification of CNT absorber composites and the effects of modification on the absorber properties are summarized in detail. The progress of two specific CNT microwave‐absorbing composites, namely flexible and high‐temperature microwave‐absorbing composites, is briefly described. The shortcomings and challenges in the application of CNT microwave‐absorbing composites are described and future research directions for CNT microwave‐absorbing composites are explored.

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Advances in Carbon-Based Microwave Absorbing Materials

Abstract: Electromagnetic (EM) pollution has been evolving as one of the most concerning environmental problems in current society, due to the extensive application of EM technology, from household electronic apparatuses to wireless base stations, as well as military radars [...]

Cited by 12 publications

References 14 publications

Design and evaluation of a rodent-specific focal transcranial magnetic stimulation coil with the custom shielding application in rats

Design and evaluation of a rodent-specific focal transcranial magnetic stimulation coil with the custom shielding application in rats

High-Performance Microwave Absorption Materials: Theory, Fabrication, and Functionalization

Structure Design, Surface Modification, and Application of CNT Microwave‐Absorbing Composites

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