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An electro-rheological study of the nematic liquid crystal 4-n-heptyl-4'-cyanobiphenyl

2010Journal article Open access
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dc.contributor.authorCidade, M. T.
dc.contributor.authorLeal, Catarina R.
dc.contributor.authorPatricio, Pedro
dc.date.accessioned2011-11-28T12:11:09Z
dc.date.available2011-11-28T12:11:09Z
dc.date.issued2010
dc.description.abstractAn experimental and theoretical study of the electro-rheological effects observed in the nematic phase of 4-n-heptyl-4'-cyanobiphenyl has been conducted. This liquid crystal appears to be a model system, in which the observed rheological behaviour can be interpreted by the Leslie-Ericksen continuum theory for low molecular weight liquid crystals. Flow curves are illustrated at different temperatures and under the influence of an external electric field ranging from 0 to 3 kV mm-1, applied perpendicular to the direction of flow. Also presented is the apparent viscosity as a function of temperature, over similar values of electric field, obtained at different shear rates. A master flow curve has been constructed for each temperature by dividing the shear rate by the square of the electric field and multiplying by the square of a reference value of electric field. In a log-log plot, two Newtonian plateaux are found to appear at low and high shear rates, connected by a shear-thinning region. We have applied the Leslie-Ericksen continuum theory, in which the director alignment angle is a function of the electric field and the flow field boundary conditions are neglected, to determine viscoelastic parameters and the dielectric anisotropy.por
dc.identifier.citationCIDADE, M. T.; LEAL, C. R.; PATRÍCIO, P. – An electro-rheological study of the nematic liquid crystal 4-n-heptyl-4'-cyanobiphenyl. Liquid Crystals. ISSN 0267-8292. Vol. 37, N.º 10 (2010), pp. 1305-1311.por
dc.identifier.eissn1366-5855
dc.identifier.issn0267-8292
dc.identifier.urihttp://hdl.handle.net/10400.21/661
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherTaylor & Francis LTDpor
dc.subjectElectrorheologypor
dc.subjectLiquid crystalspor
dc.subject7CBpor
dc.subjectContinuum theorypor
dc.titleAn electro-rheological study of the nematic liquid crystal 4-n-heptyl-4'-cyanobiphenylpor
dc.typejournal article
dspace.entity.typePublication
oaire.citation.conferencePlaceOxonpor
oaire.citation.endPage1311por
oaire.citation.issue10
oaire.citation.startPage1305por
oaire.citation.titleLiquid Crystalspor
oaire.citation.volume37
person.familyNameMarques Mendes Almeida da Rosa Leal
person.familyNamePatricio
person.givenNameCatarina
person.givenNamePedro
person.identifierA-2814-2009
person.identifier.ciencia-idAF15-486E-BB15
person.identifier.ciencia-idC616-BA77-E9C9
person.identifier.orcid0000-0001-5871-4936
person.identifier.orcid0000-0002-9050-9956
person.identifier.ridA-2750-2009
person.identifier.scopus-author-id7005379280
rcaap.rightsrestrictedAccesspor
rcaap.typearticlepor
relation.isAuthorOfPublication4db8990d-5eb1-4515-ae7a-68873cf776a5
relation.isAuthorOfPublication11a2a1d5-8165-475a-8a54-e32bd8e8ce4e
relation.isAuthorOfPublication.latestForDiscovery4db8990d-5eb1-4515-ae7a-68873cf776a5

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