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Collection of scientific works Nanosistemi, Nanomateriali, Nanotehnologii Year 2025 Vol. 23, Issue 1
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Vol. 23 / 

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V.M. KORZHYK, P.D. STUKHLIAK, O.M. BERDNIKOVA, O.V. TOTOSKO, D.P. STUKHLIAK, О.І. DEMYANOV, and K.M. LEPILINA

Protection Against Ultrahigh-Frequency Electromagnetic Radiation Using Multilayer Polymer-Composite Coatings

149–165 (2025)

PACS numbers: 07.57.-c, 78.20.Ci, 78.67.-n, 78.70.Gq, 81.16.-c, 82.35.Np, 89.20.Bb

The development of modern industry raises the problem of creating new materials for various functional purposes. One of the most important tasks is to develop protective shields against electromagnetic radiation (EMR), including at high frequencies. The primary task in this area of research is to expand the frequency range of protective shielding for the equipment and biological objects. The design of protective shields is car ried out by creating multilayer coatings with different properties of the layers. Achievement of the specified characteristics is carried out by ad justing the composition of the material of the layers. The use of polymeric materials is promising in solving this problem. The modification and fill ing of layers based on epoxy composites is carried out with nanoparticles with different physical characteristics. The multilayer coating is made by phased formation of layers of different composition from epoxy compo sites based on the following. The principle of changing the electrophysical characteristics of the layers is used to create the composites. It is im portant to increase the conductivity of the layers as they approach the back of the protective shielding coating. Different magnetic and dielectric properties of the layer materials are set to ensure phase-structural differ ences at the interface both inside the material itself and at the interface of the layers. Many industries use large-size polymer products with long dimensional surfaces of complex profiles. These include, in most cases, computer equipment housing parts. The use of such products made of thermoplastic polymeric material requires their protection against exter nal influences, including external intrusion, electromagnetic radiation of various frequencies. In this regard, for comparison, a three-layer metal coating is studied. Formation of it is performed by the method of arc metallization from wire under ultrasonic spraying and from metal powder on the polymeric surface of a 3-mm thick polycarbonate plate. The princi ple of changing the interaction of EMR with the materials of the layers, which is set by their characteristics, is preserved. Continuity of the ap plied layers is ensured. Studies on EMR shielding are carried out in the frequency range of 30–3000 MHz. Epoxy-diane resin of ED-20 grade and fillers are used in the experiments. In the formation of a multilayer epoxy coating, a carbon fibre coated with copper and nickel is used as a base. The nickel layer on the copper surface performs two functions: it increas es the internal reflection in the layer material and protects copper against oxidation. This ensures the stability of electrophysical characteristics. The back layer of the protective coating is the specified conductive carbon fi bre + ED-20, the backside of which is additionally coated with a composite containing dispersed copper. On the opposite side, the next layer is ap plied to the composite fabric: Co + ED-20. Next, a layer is formed from the material—powder (Co + Ni + Fe + Si + C) + ED-20. The closest layers to the EMR source are made on the base of ED-20 with nanocarbon multi layer tubes. In this case, we should expect an improvement in the absorb ing properties of EMR. By alternating layers, which absorb, scatter, or reflect electromagnetic waves, the frequency range is expanded. Multi layer coatings are used. Making the outer layer of dielectric material close in wave impedance to the value of the wave impedance of the external en vironment will reduce significantly the reflection of EMR by the coating as a whole. The absorption and scattering of electromagnetic energy is realized at the interface of layers with different reflection coefficients. The interaction of electromagnetic energy with dispersed particles of fill ers having high electrical conductivity is observed that additionally pro vides an expansion of the frequency range of protection against EMR. It has been established experimentally that the use of epoxy multilayer and three-layer metal coatings on a polycarbonate plate provides a different shielding mechanism

KEY WORDS: shielding, high-frequency electromagnetic radiation, epoxy composites, multilayer coatings, carbon fabric, absorption, reflection

DOI:  https://doi.org/10.15407/nnn.23.01.0149

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