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dc.contributor.authorDiez Berart, Sergio
dc.contributor.authorLópez, David O.
dc.contributor.authorSebastián Ugarteche, Nerea
dc.contributor.authorDe la Fuente Lavin, María Rosario
dc.contributor.authorSalud, Josep
dc.contributor.authorRobles Hernández, Beatriz
dc.contributor.authorPérez Jubindo, Miguel Ángel
dc.date.accessioned2016-02-18T11:51:40Z
dc.date.available2016-02-18T11:51:40Z
dc.date.issued2014-03
dc.identifier.citationMaterials 7(3) : 1502-1519 (2014)es
dc.identifier.issn1996-1944
dc.identifier.urihttp://hdl.handle.net/10810/17383
dc.description.abstractWe report an experimental study on confined systems formed by butyloxybenzylidene octylaniline liquid crystal (4O.8) + gamma-alumina nanoparticles. The effects of the confinement in the thermal and dielectric properties of the liquid crystal under different densities of nanoparticles is analyzed by means of high resolution Modulated Differential Scanning Calorimetry (MDSC) and broadband dielectric spectroscopy. First, a drastic depression of the N-I and SmA-N transition temperatures is observed with confinement, the more concentration of nanoparticles the deeper this depression is, driving the nematic range closer to the room temperature. An interesting experimental law is found for both transition temperatures. Second, the change in shape of the heat capacity peaks is quantified by means of the full width half maximum (FWHM). Third, the confinement does not noticeably affect the molecular dynamics. Finally, the combination of nanoparticles and the external applied electric field tends to favor the alignment of the molecules in metallic cells. All these results indicate that the confinement of liquid crystals by means of gamma-alumina nanoparticles could be optimum for liquid crystal-based electrooptic devices.es
dc.description.sponsorshipThe authors are grateful for financial support from the MICINN projects MAT2009-14636-C03-02,03 and MAT2012-38538-C03-02,03. The authors also thank the recognition from the Generalitat de Catalunya of GRPFM as Emergent Research Group (2009-SGR-1243) and from the Gobierno Vasco (GI/IT-449-10). One of us, NS, would like to thank the Universidad del Pais Vasco for a post-doctoral grant.es
dc.language.isoenges
dc.publisherMDPIes
dc.rightsinfo:eu-repo/semantics/openAccesses
dc.subjectliquid crystalses
dc.subjectMDSC calorimetryes
dc.subjectdielectric spectroscopyes
dc.subjectpolydispersive nanoparticleses
dc.subjectconfinementes
dc.subjectgamma-aluminaes
dc.subjectcydindrical submicrometer confinementes
dc.subjectsilica aerosil partlicleses
dc.subjectphase-transitionses
dc.subjectsmetic-Aes
dc.subjectcritical-behaviores
dc.subjectbutyloxybenzylidene octylanilinees
dc.subjectdielectric-relaxationes
dc.subjectrandom networkes
dc.subjectoctycyanobiphenyles
dc.subjectaerogelses
dc.titleDispersion of gamma-Alumina Nano-Sized Spherical Particles in a Calamitic Liquid Crystal. Study and Optimization of the Confinement Effectses
dc.typeinfo:eu-repo/semantics/articlees
dc.rights.holder2014 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).es
dc.relation.publisherversionhttp://www.mdpi.com/1996-1944/7/3/1502es
dc.identifier.doi10.3390/ma7031502
dc.departamentoesFísica aplicada IIes_ES
dc.departamentoeuFisika aplikatua IIes_ES
dc.subject.categoriaMATERIALS SCIENCE


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