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Electro-rheology study of a series of liquid crystal cyanobiphenyls: experimental and theoretical treatment

dc.contributor.authorPatricio, Pedro
dc.contributor.authorLeal, Catarina R.
dc.contributor.authorPinto, L. F. V.
dc.contributor.authorBoto, A.
dc.contributor.authorCidade, M. T.
dc.date.accessioned2023-05-26T09:35:45Z
dc.date.available2023-05-26T09:35:45Z
dc.date.issued2012-01
dc.description.abstractIn this work we study the electro-rheological behaviour of a series of four liquid crystal (LC) cyanobiphenyls with a number of carbon atoms in the alkyl group, ranging from five to eight (5CB–8CB). We present the flow curves for different temperatures and under the influence of an external electric field, ranging from 0 to 3 kV mm−1, and the viscosity as a function of the temperature, for the same values of electric field, obtained for different shear rates. Theoretical interpretation of the observed behaviours is proposed in the framework of the continuum theory of Leslie–Ericksen for low molecular weight nematic LCs. In our analysis, the director alignment angle is only a function of the ratio between the shear rate and the square of the electric field – boundary conditions are neglected. By fitting the theoretical model to the experimental data, we are able to determine some viscosity coefficients and the dielectric anisotropy as a function of temperature. To interpret the behaviour of the flow curves near the nematic–isotropic transitions, we apply the continuum theory of Olmsted–Goldbart, which extends the theory of Leslie–Ericksen to the case where the degree of alignment of the LC molecules can also vary.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationPATRÍCIO, P.; [et al] – Electro-rheology study of a series of liquid crystal cyanobiphenyls: experimental and theoretical treatment. Liquid Crystals. ISSN 0267-8292. Vol. 39, N.º 1 (2012), pp. 25-37.pt_PT
dc.identifier.doi10.1080/02678292.2011.610471pt_PT
dc.identifier.eissn1366-5855
dc.identifier.issn0267-8292
dc.identifier.urihttp://hdl.handle.net/10400.21/16146
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherTaylor & Francispt_PT
dc.relationStrategic Project - UI 618 - 2011-2012
dc.relation.publisherversionhttps://www.tandfonline.com/doi/epdf/10.1080/02678292.2011.610471?needAccess=true&role=buttonpt_PT
dc.subjectLiquid crystalspt_PT
dc.subjectElectro-rheology;pt_PT
dc.subjectLeslie–Ericksen theorypt_PT
dc.subjectCyanobiphenylspt_PT
dc.titleElectro-rheology study of a series of liquid crystal cyanobiphenyls: experimental and theoretical treatmentpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleStrategic Project - UI 618 - 2011-2012
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/PEst-OE%2FFIS%2FUI0618%2F2011/PT
oaire.citation.endPage37pt_PT
oaire.citation.issue1pt_PT
oaire.citation.startPage25pt_PT
oaire.citation.titleLiquid Crystalspt_PT
oaire.citation.volume39pt_PT
oaire.fundingStream6817 - DCRRNI ID
person.familyNamePatricio
person.familyNameMarques Mendes Almeida da Rosa Leal
person.givenNamePedro
person.givenNameCatarina
person.identifierA-2814-2009
person.identifier.ciencia-idC616-BA77-E9C9
person.identifier.ciencia-idAF15-486E-BB15
person.identifier.orcid0000-0002-9050-9956
person.identifier.orcid0000-0001-5871-4936
person.identifier.ridA-2750-2009
person.identifier.scopus-author-id7005379280
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsclosedAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication11a2a1d5-8165-475a-8a54-e32bd8e8ce4e
relation.isAuthorOfPublication4db8990d-5eb1-4515-ae7a-68873cf776a5
relation.isAuthorOfPublication.latestForDiscovery11a2a1d5-8165-475a-8a54-e32bd8e8ce4e
relation.isProjectOfPublication36983bb6-2326-475f-9007-6986cc57e492
relation.isProjectOfPublication.latestForDiscovery36983bb6-2326-475f-9007-6986cc57e492

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