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Liquid crystal beads constrained on thin cellulosic fibers: Electric field induced microrotors and N-I transition

2012Journal article Restricted access
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dc.contributor.authorGeng, Yong
dc.contributor.authorAlmeida, Pedro L.
dc.contributor.authorFigueirinhas, João
dc.contributor.authorTerentjev, Eugene
dc.contributor.authorGodinho, Maria Helena
dc.date.accessioned2015-09-10T11:52:46Z
dc.date.available2015-09-10T11:52:46Z
dc.date.issued2012
dc.description.abstractWe directly visualize the response of nematic liquid crystal drops of toroidal topology threaded in cellulosic fibers, suspended in air, to an AC electric field and at different temperatures over the N-I transition. This new liquid crystal system can exhibit non-trivial point defects, which can be energetically unstable against expanding into ring defects depending on the fiber constraining geometries. The director anchoring tangentially near the fiber surface and homeotropically at the air interface makes a hybrid shell distribution that in turn causes a ring disclination line around the main axis of the fiber at the center of the droplet. Upon application of an electric field, E, the disclination ring first expands and moves along the fiber main axis, followed by the appearance of a stable "spherical particle" object orbiting around the fiber at the center of the liquid crystal drop. The rotation speed of this particle was found to vary linearly with the applied voltage. This constrained liquid crystal geometry seems to meet the essential requirements in which soliton-like deformations can develop and exhibit stable orbiting in three dimensions upon application of an external electric field. On changing the temperature the system remains stable and allows the study of the defect evolution near the nematic-isotropic transition, showing qualitatively different behaviour on cooling and heating processes. The necklaces of such liquid crystal drops constitute excellent systems for the study of topological defects and their evolution and open new perspectives for application in microelectronics and photonics.por
dc.identifier.citationGENG, Yong; [et al] – Liquid crystal beads constrained on thin cellulosic fibers: Electric field induced microrotors and N-I transition. Soft Matter. ISSN: 1744-683X. Vol. 8, nr. 13 (2012), pp. 3634-3640por
dc.identifier.doi10.1039/c2sm06602e
dc.identifier.issn1744-683X
dc.identifier.urihttp://hdl.handle.net/10400.21/5154
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherRoyal Soc Chemistrypor
dc.relationAir Force Office of Scientific Research, Air Force Material Command, USAF - FA8655-10-1-3020
dc.relationPortuguese Science and Technology Foundation - SFRH/BD/63574/2009
dc.relationPortuguese Science and Technology Foundation - PTDC/CTM/099595/2008
dc.relationPortuguese Science and Technology Foundation - PTDC/FIS/110132/2009
dc.relationWindsor Treaty grant - 2009-10 UR55
dc.subjectStructural Transformationspor
dc.subjectAlignment Layerspor
dc.subjectLight-Scatteringpor
dc.subjectPoint-Defectspor
dc.subjectNematic Dropspor
dc.subjectFilmspor
dc.subjectMicrodropletspor
dc.subjectElasticitypor
dc.titleLiquid crystal beads constrained on thin cellulosic fibers: Electric field induced microrotors and N-I transitionpor
dc.typejournal article
dspace.entity.typePublication
oaire.citation.conferencePlaceCambridge
oaire.citation.endPage3640por
oaire.citation.issue13por
oaire.citation.startPage3634por
oaire.citation.titleSoft Matterpor
oaire.citation.volume8por
person.familyNameMarques de Almeida
person.familyNameFigueirinhas
person.familyNameTerentjev
person.familyNameGodinho
person.givenNamePedro
person.givenNameJoão
person.givenNameEugene
person.givenNameMaria Helena
person.identifier2206212
person.identifier.ciencia-id0218-71B2-2DE0
person.identifier.ciencia-idCB1B-52B5-D425
person.identifier.ciencia-idC316-7B1F-4513
person.identifier.orcid0000-0001-7356-8455
person.identifier.orcid0000-0001-9254-1864
person.identifier.orcid0000-0003-3517-6578
person.identifier.orcid0000-0002-9760-5983
person.identifier.ridB-4356-2009
person.identifier.ridA-4278-2013
person.identifier.ridB-7623-2011
person.identifier.ridJ-3679-2013
person.identifier.scopus-author-id57190384213
person.identifier.scopus-author-id55909453200
person.identifier.scopus-author-id7004774973
person.identifier.scopus-author-id7005654016
rcaap.rightsclosedAccesspor
rcaap.typearticlepor
relation.isAuthorOfPublication429b6d71-328e-42b3-8151-15493de249b8
relation.isAuthorOfPublication8287ac27-3195-4e9d-956f-63e80198f99e
relation.isAuthorOfPublicationd7a5355b-d6af-41fd-ae05-8f587291186c
relation.isAuthorOfPublication9e92c2e7-f179-42a4-b284-2b30b769aa0b
relation.isAuthorOfPublication.latestForDiscovery9e92c2e7-f179-42a4-b284-2b30b769aa0b

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