Research into protective properties of electromagnetic screens based on the metal-containing nanostructures

Glyva, Valentyn; Kovalenko, V. G.; Levchenko, Larysa; Tykhenko, Oksana

doi:10.15587/1729-4061.2017.103167

Cited by 11 publications

(8 citation statements)

References 3 publications

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“…In the field of electronics, nanocomposite materials have found wide potential [135]. However, the functioning of electronic devices may hinder other devices, humans, and the environment due to the generation of harmful electromagnetic radiations [136]. Therefore, the applications of nanocomposites have also been extended to shield the harmful electromagnetic interference (EMI) radiations [137,138].…”

Section: Significance Of Electrospun Polymer/nanocarbon Nanocomposite...mentioning

confidence: 99%

Electrospinning Processing of Polymer/Nanocarbon Nanocomposite Nanofibers—Design, Features, and Technical Compliances

Kausar

Ahmad

2023

J. Compos. Sci.

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Polymeric nanofibers have emerged as exclusive one-dimensional nanomaterials. Various polymeric nanofibers and nanocomposite nanofibers have been processed using the thermoplastic, conducting, and thermoset matrices. This review aims to highlight the worth of electrospinning technology for the processing of polymer/nanocarbon nanocomposite nanofibers. In this regard, the design, morphology, physical properties, and applications of the nanofibers were explored. The electrospun polymer/nanocarbon nanofibers have a large surface area and fine fiber orientation, alignment, and morphology. The fiber processing technique and parameters were found to affect the nanofiber morphology, diameter, and essential physical features such as electrical conductivity, mechanical properties, thermal stability, etc. The polymer nanocomposites with nanocarbon nanofillers (carbon nanotube, graphene, fullerene, etc.) were processed into high-performance nanofibers. Successively, the electrospun nanocomposite nanofibers were found to be useful for photovoltaics, supercapacitors, radiation shielding, and biomedical applications (tissue engineering, antimicrobials, etc.).

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Section: Significance Of Electrospun Polymer/nanocarbon Nanocomposite...mentioning

confidence: 99%

Electrospinning Processing of Polymer/Nanocarbon Nanocomposite Nanofibers—Design, Features, and Technical Compliances

Kausar

Ahmad

2023

J. Compos. Sci.

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“…In a thorough survey work [4], it is shown that gradient properties can also be found in materials intended for individual protection and not very suitable for facing surfaces. Research [5] shows that it is possible to obtain a gradient of physical properties in a heterogeneous material.…”

Section: Analysis Of Recent Research and Publicationsmentioning

confidence: 99%

Designing finishing materials with a gradient of electrophysical properties

Biruk

2022

esanr

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Тhe article discusses the basics of development and production of materials for shielding electromagnetic fields in a wide range of frequencies. The purpose of these materials is to cover large surface areas. The basic requirements for these types of materials have been established. The main ones are: the front surface must have electrophysical properties (dielectric and magnetic permeability) to ensure the lowest possible reflection coefficient of electromagnetic waves. At the same time, it is mandatory to simultaneously ensure the characteristics of strength, fire resistance, non-toxicity, etc. The content of radio-absorbing particles and effective dielectric (magnetic) permeability in the interlayer of the layered structure in the direction of growth of the substrate should ensure broadband and efficiency of the material. The dispersion dependence should ensure uniform absorption of electromagnetic energy and its passage from the input surface to the substrate in a given frequency range. Based on the maximum and minimum wavelengths of the shielding field, permeability and thickness of individual layers, calculations of the required thickness of the gradient material for a given reflection coefficient are given. Thanks to heat treatment of the surface of the material in the manufacturing process, the possibility of manufacturing monolithic metal-polymer screens with surface layers of low dielectric permeability is shown. The possibility of creating monolithic metal-polymer screens from ferromagnetic finely dispersed substances with an adjustable gradient in the direction from the front surface to the bottom is demonstrated, and a technical solution is given. This material can be used to control the ratio of shielding factors for high-frequency electromagnetic fields, ultra-low-frequency electric and magnetic fields, as well as concomitant shielding from natural magnetic fields.

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“…As regards the measures and means of protection of welders, it is known that to protect against the harmful effects of MF, they mainly use the shielding of MF sources (welding equipment or welders themselves) [10]. To that end, one can use both well-known metal materials and the latest metal-containing nanostructured shielding materials [11].…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Determining patterns in the generation of magnetic fields when using different arc welding techniques

Levchenko¹,

Polukarov²,

Goncharova³

et al. 2022

EEJET

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This paper reports a study into the levels of magnetic fields induced by arc welding equipment in various ways in order to assess their impact on the body of welders. It is known that welders are exposed to a magnetic field of high intensity. Depending on the welding technique and the type of welding equipment, it may exceed the maximum permissible levels (MPL). Note that new Ukrainian sanitary standards for magnetic fields have been introduced, which regulate their levels depending on the frequency range. Therefore, it became necessary to carry out their hygienic assessment according to the new standards in order to devise appropriate methods for protecting welders. To this end, it was required to choose a new generation of devices to determine the intensity of magnetic fields induced by welding equipment. Based on the analysis of the constructed oscillograms and spectrograms of magnetic fields, it was found that semi-automatic welding with a metal electrode in carbon dioxide is characterized by an increased level of magnetic field in the frequency range of 50‒1000 Hz. With automatic arc welding under the flux, there are no excess of the maximum permissible levels of individual harmonics of the magnetic field but there is an excess of the total value of all harmonic components of the magnetic field. Manual arc welding with direct current involving a non-melting electrode in argon is characterized by a moderate level of magnetic field in workplace. During manual arc welding with coated electrodes, the exceeded level of the magnetic field is observed only on the electrode cable itself. It is shown that the spectral composition of the magnetic field signal is determined mainly by the welding technique itself, the peculiarities of arc combustion, and the nature of the transfer of electrode metal in the arc gap, as well as the initial parameters of the power supplies of the welding arc

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Research into protective properties of electromagnetic screens based on the metal-containing nanostructures

Cited by 11 publications

References 3 publications

Electrospinning Processing of Polymer/Nanocarbon Nanocomposite Nanofibers—Design, Features, and Technical Compliances

Electrospinning Processing of Polymer/Nanocarbon Nanocomposite Nanofibers—Design, Features, and Technical Compliances

Designing finishing materials with a gradient of electrophysical properties

Determining patterns in the generation of magnetic fields when using different arc welding techniques

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