Mechanism of charge transport in castor oil-based polyurethane/carbon black composite (PU/CB)

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dc.contributor.authorda Silva, M. J. [UNESP]
dc.contributor.authorKanda, D. H. F. [UNESP]
dc.contributor.authorNagashima, Haroldo Naoyuki [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T13:29:49Z
dc.date.available2014-05-20T13:29:49Z
dc.date.issued2012-01-15
dc.description.abstractIn order to identify and quantify the conduction mechanisms involved in the transport process, castor oil based polyurethane/carbon black composite (PU/CB) was introduced in a statistical model that reproduced the ac conductivity of composite PU/CB measurements by the application of a transfer-matrix technique. The simulation is based on virtual composite sample generation represented by a two-dimensional model of a resistor-capacitor network. The network represents a microstructure that contains both insulating (polyurethane) and conductive regions (carbon black). Drude's formula was applied in the conductance calculation between two neighboring sites in the CB particles or aggregates, and Miller-Abrahams formula in conductance between two neighboring sites of the polymeric matrix. The theoretical-experimental adjustment indicates that, at low frequencies (below 10(3) Hz), the transport mechanism by charges hopping in the polymeric matrix is dominant. on the other hand, at high frequencies (above 10(5) Hz) electron conduction in carbon black, given by Drude's formula, is dominant. The ac conductivity in the polymeric matrix is determined by the competition of two processes, one connected to hopping between the nearest sites with large energy difference or to hopping between the sites beyond the nearest neighbors with small energy difference. (C) 2011 Elsevier B.V. All rights reserved.en
dc.description.affiliationUNESP Univ Estadual Paulista, Fac Engn Ilha Solteira, Dept Fis & Quim, BR-15385000 Ilha Solteira, SP, Brazil
dc.description.affiliationUnespUNESP Univ Estadual Paulista, Fac Engn Ilha Solteira, Dept Fis & Quim, BR-15385000 Ilha Solteira, SP, Brazil
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.format.extent270-275
dc.identifierhttp://dx.doi.org/10.1016/j.jnoncrysol.2011.09.032
dc.identifier.citationJournal of Non-crystalline Solids. Amsterdam: Elsevier B.V., v. 358, n. 2, p. 270-275, 2012.
dc.identifier.doi10.1016/j.jnoncrysol.2011.09.032
dc.identifier.issn0022-3093
dc.identifier.lattes4802713321439692
dc.identifier.lattes0607115205166943
dc.identifier.urihttp://hdl.handle.net/11449/10103
dc.identifier.wosWOS:000298909400024
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofJournal of Non-Crystalline Solids
dc.relation.ispartofjcr2.488
dc.relation.ispartofsjr0,722
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectStatistical modelen
dc.subjectResistor-capacitor networken
dc.subjectCarbon blacken
dc.subjectCastor oil based polyurethaneen
dc.subjectConduction mechanismen
dc.titleMechanism of charge transport in castor oil-based polyurethane/carbon black composite (PU/CB)en
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
unesp.author.lattes4802713321439692
unesp.author.lattes0607115205166943
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Engenharia, Ilha Solteirapt

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Artigos - Física e Química - FEIS