Efficacy of Net Epoxy Resin for Electromagnetic Shielding in X-Band Frequency Range

Zaroushani, Vida; Khavanin, Ali; Mortazavi, Seyed Bagher; Jafari, Ahmad Jonidi

doi:10.17795/jhealthscope-30203

Cited by 7 publications

(6 citation statements)

References 29 publications

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“…Zaroushani et al . reported the EMI SE in the X‐band frequency range for neat epoxy network cured with polyamido amine imidozolium but the value was low for the samples with 2 mm thickness (around 1.9 dB) …”

Section: Resultsmentioning

confidence: 99%

Epoxy/imidazolium‐based ionic liquid systems: The effect of the hardener on the curing behavior, thermal stability, and microwave absorbing properties

Carvalho

Santos

Soares

2019

J of Applied Polymer Sci

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A new transparent microwave absorbing coating was developed by compounding 1-butyl-3-methyl imidazolium tetrafluoroborate (bmim.BF 4 ) ionic liquid (IL) with diglycidyl ether of bisphenol A-type epoxy resin. The systems were crosslinked with the IL alone or combined with conventional hardeners, as anhydride or aromatic amine. The curing behavior was investigated by thermal and spectroscopic analysis performed at high temperatures. Neat bmim.BF 4 was able to cure epoxy resin, giving rise to networks with outstanding thermal stability compared with the systems cured with anhydride or aromatic amine. bmim.BF 4 accelerated the curing process in the presence of aromatic amine but retarded this event when anhydride was used as an external curing agent. The glass-transition temperature evaluated by dynamic mechanical analysis decreased when the amount of IL increased, which can be attributed to side reactions during the curing process, as well as the plasticizing effect of IL. The epoxy networks cured with bmim.BF 4 alone or in combination with anhydride or aromatic amine were transparent and presented considerable microwave absorbing properties in the X-band frequency range (8-12 GHz), being the best performance observed for the systems cured with bmim.BF4/anhydride curing system, with reflection loss value around −16 dB at 11.3 GHz.

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Section: Resultsmentioning

confidence: 99%

Epoxy/imidazolium‐based ionic liquid systems: The effect of the hardener on the curing behavior, thermal stability, and microwave absorbing properties

Carvalho

Santos

Soares

2019

J of Applied Polymer Sci

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“…The problem of protection against high energy microwaves EM radiation is typical due to high intensity reciprocal interference of electronic instruments working in close proximity [1][2][3][4][5][6]. Furthermore, uncontrolled long-term exposure to these radiations imposes hazardous consequences on living organism creating potential health risk even jeopardizing their life [7]. Electromagnetic shielding is probably best option to mitigate the hazardous effect of unwanted microwave radiation.…”

Section: Introductionmentioning

confidence: 99%

“…A number of studies related to the effect of number of layers on EMSE conducted by researchers confirm that the EMSE increases with an increase in the number of conductive fabric layers [1][2][3][4][5][6][7][8][9]. Prerumalraj et al 2009 [13] produced copper core yarns to make twill and plain-woven fabrics, it was observed that, the EMSE of double layered fabrics in both weave configurations increases in comparison with their single layer variants.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic shielding performance of copper and silver-plated hybrid yarn based multilayer fabrics in C & X band frequency range

Pandey¹,

Basu²,

Kumar³

2021

Journal of Industrial Textiles

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In the present study, a strategic designing of multilayer shield was planned to enhance the multiple reflection phenomenon to achieve maximum absorption properties in microwave frequency (C & X band) range. Multi-layer EMR shields were developed using pure cotton fabric and conductive woven fabrics, incorporated with copper- based & silver-plated hybrid yarn. First of all, single layer fabrics were produced in five variants, nomenclature as L1A (pure cotton) L1B, L1C (copper-based hybrid yarn), LS1B and LS1C (silver plated hybrid yarn). These five variants were used to prepare four sets of double & triple layer fabric. In both double and triple layer composition, L1A fabric (pure cotton) was used as top layer followed by B and C series fabrics, containing copper and silver-plated hybrid yarn. The EMSE performance in C and X band frequency range of single layer, double layer and triple layers in terms of scattering parameters S11(reflectance) & S21 (transmittance) in vertical and horizontal wave polarization was studied. It was found that number of layers, layer composition, orientation of metallic yarn, frequency and EM wave polarization have significant influence on overall electromagnetic shielding effectiveness.

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“…In recent years, there have also been many electromag-netic compatibility studies on nanocomposites for electromagnetic shielding (10)(11)(12)(13)(14)(15)(16)(17). In electromagnetic shield topics, the selection of suitable shields is an important and interesting subject for experts in this field.…”

Section: Introductionmentioning

confidence: 99%

A Quantitative Index to Rank and Select Electromagnetic Shields in Radiofrequency and Microwave Radiation

Zaroushani

Khajehnasiri

2020

Health Scope

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Background: In electromagnetic shielding topics, the selection of suitable shields is an important subject and the lack of a specific ranking index for choosing protective shields causes problems in decision-making. Thus, this study proposes a quantitative index to rank and select electromagnetic shields in radiofrequency and microwave radiation. Objectives: The objective of this study was to construct a simple quantitative index to rank and select electromagnetic shields in radiofrequency and microwave radiation. Methods: A cross-sectional study was designed. In this study, the construction of the ranking index was carried out in four main stages including stabilizing the concept, analytical structure and variable selection, weighing and combination of variables, and validating the index. In this study, the average, minimum, maximum, and standard deviation of shielding effectiveness were considered the main phenomenon variables. Finally, the ranking index and ranking difference index were created as percentages to rank and select electromagnetic shields. Results: In this study, a quantitative index was made as percentages called "Ranking Index" to rank and select the premier and preferable shield. Moreover, to indicate the difference in the shielding effectiveness of various shields, the "Difference Index" was made as percentages. Conclusions: This study presented a simple quantitative index to rank electromagnetic shields. It could be used as a selection tool in radiation safety management. Moreover, this ranking index had a simple formula that could be calculated easily and quickly in excel software with high accuracy and low cost. In addition, it could be easily incorporated into a user-friendly tool for the ease of application. A case study of electromagnetic nanocomposite shields was conducted to use the Ranking Index, which showed its capability for ranking the shielding performance of studied electromagnetic shields. This index can create similar scientific literature to report the efficacy of electromagnetic shields and the selection of preferred shields in different research studies. It is suggested that future studies examine this quantitative index in other frequency ranges.

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Efficacy of Net Epoxy Resin for Electromagnetic Shielding in X-Band Frequency Range

Cited by 7 publications

References 29 publications

Epoxy/imidazolium‐based ionic liquid systems: The effect of the hardener on the curing behavior, thermal stability, and microwave absorbing properties

Epoxy/imidazolium‐based ionic liquid systems: The effect of the hardener on the curing behavior, thermal stability, and microwave absorbing properties

Electromagnetic shielding performance of copper and silver-plated hybrid yarn based multilayer fabrics in C & X band frequency range

A Quantitative Index to Rank and Select Electromagnetic Shields in Radiofrequency and Microwave Radiation

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