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dc.contributor.authorMeisak,Darya
dc.contributor.authorMacutkevic, Jan
dc.contributor.authorPlyushch, Artyom
dc.contributor.authorKuzhir, Polina
dc.contributor.authorSelskis, Algirdas
dc.contributor.authorBanys, Juras
dc.date.accessioned2020-05-08T09:13:05Z
dc.date.available2020-05-08T09:13:05Z
dc.date.issued2020
dc.identifier.urihttps://erepo.uef.fi/handle/123456789/8118
dc.description.abstractThe electrical properties of epoxy/MWCNT (multi-walled carbon nanotubes)/MnFe2O4 hybrid composites loaded with MWCNTs (below, 0.09 vol.%, and above, 0.58 vol.%, percolation threshold) and varying concentrations of MnFe2O4 up to 10 vol.% were studied in a wide frequency range (20 Hz–40 GHz) at different temperatures (20 K–500 K). At low frequencies, the dielectric permittivity and the electrical conductivity of composites with fixed amounts of MWCNT are strongly dependent on MnFe2O4 content. For MWCNT concentrations above the percolation threshold (i.e., 0.58 vol.%), the electrical conductivity highly decreases with the increase of the MnFe2O4 fraction. In contrast, for the epoxy/MWCNT just below the onset of electrical conductivity (0.09 vol.% of MWCNTs), there exists an optimal concentration of MnFe2O4 inclusions (i.e., 0.025 vol.%), leading to a dramatic increase of the electrical conductivity by three orders of magnitude. The electrical transport in composites is mainly governed by electron tunneling at lower temperatures (below 200 K), and it is highly impacted by the matrix conductivity at higher temperatures (above 400 K). The electrical properties were discussed in terms of the Maxwell–Wagner relaxation and distributions of relaxation times. A non-invasive platform based on dielectric relaxation spectroscopy was proposed for enhancing the synergetic effect coursed by using multiple nanoinclusions in polymer composites just below the percolation threshold.
dc.language.isoenglanti
dc.publisherMDPI AG
dc.relation.ispartofseriesPolymers
dc.relation.urihttp://dx.doi.org/10.3390/polym12030697
dc.rightsCC BY http://creativecommons.org/licenses/by/4.0/
dc.titleDielectric Relaxation in the Hybrid Epoxy/MWCNT/MnFe2O4 Composites
dc.description.versionpublished version
dc.contributor.departmentDepartment of Physics and Mathematics, activities
uef.solecris.id69423769en
dc.type.publicationTieteelliset aikakauslehtiartikkelit
dc.rights.accessrights© Authors
dc.relation.doi10.3390/polym12030697
dc.description.reviewstatuspeerReviewed
dc.publisher.countrySveitsi
dc.relation.articlenumber697
dc.relation.issue3
dc.relation.volume12
dc.rights.accesslevelopenAccess
dc.type.okmA1
uef.solecris.openaccessOpen access -julkaisukanavassa ilmestynyt julkaisu


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