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How foam-like is the shear-induced lamellar phase of an ionic liquid crystal?

2008-09Journal article Restricted access
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dc.contributor.authorCruz, C.
dc.contributor.authorGodinho, M. H.
dc.contributor.authorFerreira, A. J.
dc.contributor.authorKulkarni, P. S.
dc.contributor.authorAfonso, C. A. M.
dc.contributor.authorTeixeira, Paulo
dc.date.accessioned2014-06-18T15:41:10Z
dc.date.available2014-06-18T15:41:10Z
dc.date.issued2008-09
dc.descriptionPhilosophical Magazine Letters Volume 88, Issue 9-10, 2008 Special Issue: Solid and Liquid Foams. In commemoration of Manuel Amaral Fortespor
dc.description.abstractIn a recent article [ M. H. Godinho et al., Liq. Cryst. 35, 103 ( 2008)] we reported that sheared films of two n-alkylimidazolium salts exhibit liquid crystalline behaviour below their bulk equilibrium freezing temperature. The resulting morphologies are strongly reminiscent of two-dimensional liquid foams: the materials partition into dark domains ( cells) separated by brighter ( birefringent) walls, which are approximately arcs of circle and meet at vertices ("Plateau borders") with three or more sides. Here we investigate whether they satisfy known quantitative results for foams [see, e. g. D. Weaire and S. Hutzler, The Physics of Foams ( Oxford University Press, Oxford, 1999)]. We find that: (i) where three walls meet, they do so at approximately 120 degrees angles, for all times studied; (ii) Lewis's law of linear relation between cell area and number of sides is approximately satisfied at late times; (iii) the morphological patterns coarsen in time, both T1 and T2 processes are observed and, at late times, evolution is consistent with von Neumann's law; and (iv) relatively large numbers of 5-sided cells survive up to fairly late times. Results ( i) and ( iii) suggest that surface tension may play a key role in determining the physics of this system, as it does in low-viscosity liquid foams.por
dc.identifier.citationCRUZ, C.; GODINHO, M. H.; FERREIRA, A. J.; KULKARNI, P. S.; AFONSO, C. A. M.; TEIXEIRA, P. I. C. - How foam-like is the shear-induced lamellar phase of an ionic liquid crystal?. Philosophical Magazine Letters. ISSN 0950-0839. Vol. 88, nr. 9-10 (2008), p. 741-747.por
dc.identifier.issn0950-0839
dc.identifier.issn1362–3036
dc.identifier.other10.1080/09500830802195087
dc.identifier.urihttp://hdl.handle.net/10400.21/3640
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherTaylor & Francis Ltdpor
dc.relation.publisherversionhttp://www.tandfonline.com/doi/abs/10.1080/09500830802195087#.U6GwZYZJ6vwpor
dc.subjectLiquid foamspor
dc.subjectIonic liquid crystalspor
dc.subjectShearpor
dc.titleHow foam-like is the shear-induced lamellar phase of an ionic liquid crystal?por
dc.typejournal article
dspace.entity.typePublication
oaire.citation.conferencePlaceOxonpor
oaire.citation.endPage747por
oaire.citation.issue9-10por
oaire.citation.startPage741por
oaire.citation.titlePhilosophical Magazine Letterspor
oaire.citation.volume88por
person.familyNameTeixeira
person.givenNamePaulo
person.identifier.ciencia-idB31A-0CBD-8AC4
person.identifier.orcid0000-0003-2315-2261
person.identifier.ridA-2682-2009
person.identifier.scopus-author-id7005895098
rcaap.rightsrestrictedAccesspor
rcaap.typearticlepor
relation.isAuthorOfPublication35a012c6-2e8b-402f-9b82-065843fce9aa
relation.isAuthorOfPublication.latestForDiscovery35a012c6-2e8b-402f-9b82-065843fce9aa

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