Complex permittivity of polymer-based composites with carbon nanotubes in microwave band

Yakovenko, O. S.; Matzui, L. Yu.; Вовченко, Л. Л.; Lazarenko, Oleksandra; Perets, Yu. S.; Lozitsky, O. V.

doi:10.1007/s13204-019-01083-5

Cited by 7 publications

(8 citation statements)

References 40 publications

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“…The real part of complex permittivity ε represents the electrical charge storage capacity in the material and can be understood as the amount of polarization centers and microcapacitors [31]. It is mainly influenced by the polarization (formation of localized charges) within the composite system.…”

Section: Electromagnetic Shielding Characteristics and Electrical Conducitity Of Composites Filled With Ferrite And Carbon Nanotubesmentioning

confidence: 99%

Mechanical, Thermal, Electrical Characteristics and EMI Absorption Shielding Effectiveness of Rubber Composites Based on Ferrite and Carbon Fillers

et al. 2021

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In this work, rubber composites were fabricated by incorporation of manganese-zinc ferrite alone and in combination with carbon-based fillers into acrylonitrile-butadiene rubber. Electromagnetic parameters and electromagnetic interference (EMI) absorption shielding effectiveness of composite materials were examined in the frequency range 1 MHz–3 GHz. The influence of ferrite and fillers combination on thermal characteristics and mechanical properties of composites was investigated as well. The results revealed that ferrite imparts absorption shielding efficiency to the composites in tested frequency range. The absorption shielding effectiveness and absorption maxima of ferrite filled composites shifted to lower frequencies with increasing content of magnetic filler. The combination of carbon black and ferrite also resulted in the fabrication of efficient EMI shields. However, the EMI absorption shielding effectiveness was lower, which can be ascribed to higher electrical conductivity and higher permittivity of those materials. The highest conductivity and permittivity of composites filled with combination of carbon nanotubes and ferrite was responsible for the lowest absorption shielding effectiveness within the examined frequency range. The results also demonstrated that combination of ferrite with carbon-based fillers resulted in the enhancement of thermal conductivity and improvement of mechanical properties.

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Section: Electromagnetic Shielding Characteristics and Electrical Conducitity Of Composites Filled With Ferrite And Carbon Nanotubesmentioning

confidence: 99%

Mechanical, Thermal, Electrical Characteristics and EMI Absorption Shielding Effectiveness of Rubber Composites Based on Ferrite and Carbon Fillers

et al. 2021

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“…Higher electrical conductivity of composites filled with carbon fibres and ferrites was reflected in their higher complex permittivity. As already mentioned, real permittivity represents electric charge storage in the material and is related mainly to amount of micro-capacitors and polarization mechanisms [ 43 ]. Polarization of the conducting filler, rubber matrix as well as filler–rubber interfacial polarization happens depending on frequency range [ 44 , 45 ].…”

Section: Resultsmentioning

confidence: 99%

Curing, Properties and EMI Absorption Shielding of Rubber Composites Based on Ferrites and Carbon Fibres

et al. 2023

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In this work, magnetic soft ferrites, namely manganese–zinc ferrite, nickel–zinc ferrite and combinations of both fillers, were incorporated into acrylonitrile-butadiene rubber to fabricate composite materials. The total content of ferrites was kept constant—300 phr. The second series of composites was fabricated with a similar composition. Moreover, carbon fibres were incorporated into rubber compounds in constant amount—25 phr. The work was focused on investigation of the fillers on absorption shieling performance of the composites, which was investigated within the frequency range 1–6 GHz. Then, the physical–mechanical properties of the composites were evaluated. The achieved results demonstrated that the absorption shielding efficiency of both composite types increased with increasing proportion of nickel–zinc ferrite, which suggests that nickel–zinc ferrite demonstrated better absorption shielding potential. Higher electrical conductivity and higher permittivity of composites filled with carbon fibres and ferrites resulted in their lower absorption shielding performance. Simultaneously, they absorbed electromagnetic radiation at lower frequencies. On the other hand, carbon fibres reinforced the rubber matrix, and subsequent improvement in physical–mechanical properties was recorded.

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“…Also, composites based on CB and 300 phr of ferrites exhibited higher conductivity and consequently higher permittivity when compared to equivalent composites filled with CB and 200 of ferrites. As already mentioned, the real permittivity represents electric charge storage capacity in the material and relates mainly to number of microcapatitors and polarization mechanisms 41 . Polarization of the filler, rubber matrix, as well as interfacial filler‐rubber polarization occurs in dependence on frequency range 42,43 .…”

Section: Resultsmentioning

confidence: 99%

“…As already mentioned, the real permittivity represents electric charge storage capacity in the material and relates mainly to number of microcapatitors and polarization mechanisms. 41 Polarization of the filler, rubber matrix, as well as interfacial filler-rubber polarization occurs in dependence on frequency range. 42,43 The higher content of ferrites resulted in higher polarization of the fillers.…”

Section: Investigation Of Shielding Characteristicsmentioning

confidence: 99%

Electromagnetic absorption shielding effectiveness and physical‐mechanical properties of rubber composites

Kruželák,

Kvasničáková,

Džuganová

et al. 2023

Polymers for Advanced Techs

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Manganese‐zinc ferrite, nickel‐zinc ferrite, and the combinations of both ferrites in constant level 200 phr were incorporated into acrylonitrile‐butadiene rubber. The amount of carbon black was constant in each composite −25 phr. The second series of composites was fabricated with similar composition, but the total content of ferrites or ferrites combinations was 300 phr, while the content of carbon black was 25 phr. The work was focused on investigation of electromagnetic absorption shielding effectiveness of composites and their physical‐mechanical properties. During the study, good correlation between conductivity, permittivity, and electromagnetic absorption parameters was established. Higher conductivity was reflected in higher permittivity of composites, which subsequently resulted in their lower absorption shielding performance. The experimental outputs revealed that absorption shielding effectiveness was enhanced with increasing with proportion of nickel‐zinc ferrite, which pointed out to higher absorption shielding potential of nickel‐zinc ferrite. The physical‐mechanical properties were found not to be influenced by the type of ferrite or ferrites combinations. The higher overall content of ferrites in rubber matrix caused the decrease in tensile characteristics of composites, suggesting that ferrites are inactive fillers considering the physical‐mechanical properties.

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Complex permittivity of polymer-based composites with carbon nanotubes in microwave band

Cited by 7 publications

References 40 publications

Mechanical, Thermal, Electrical Characteristics and EMI Absorption Shielding Effectiveness of Rubber Composites Based on Ferrite and Carbon Fillers

Mechanical, Thermal, Electrical Characteristics and EMI Absorption Shielding Effectiveness of Rubber Composites Based on Ferrite and Carbon Fillers

Curing, Properties and EMI Absorption Shielding of Rubber Composites Based on Ferrites and Carbon Fibres

Electromagnetic absorption shielding effectiveness and physical‐mechanical properties of rubber composites

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