Two glass transitions associated to different dynamic disorders in the nematic glassy state of a non-symmetric liquid crystal dimer dopped with γ-alumina nanoparticles

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license.-- et al.

Detalles Bibliográficos
Autores: Diez-Berart, Sergio, López, David O., Robles-Hernández, Beatriz, Fuente, M. Rosario de la, Ros, M. Blanca
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2015
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/147838
Acceso en línea:http://hdl.handle.net/10261/147838
Access Level:acceso abierto
Palabra clave:Dielectric spectroscopy
Liquid crystal
Dimer
Glass transition
Confinement
Nanoparticles
Modulated differential scanning calorimetry (MDSC)
Thermally stimulated depolarization currents (TSDC)
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spelling Two glass transitions associated to different dynamic disorders in the nematic glassy state of a non-symmetric liquid crystal dimer dopped with γ-alumina nanoparticlesDiez-Berart, SergioLópez, David O.Robles-Hernández, BeatrizFuente, M. Rosario de laRos, M. BlancaDielectric spectroscopyLiquid crystalDimerGlass transitionConfinementNanoparticlesModulated differential scanning calorimetry (MDSC)Thermally stimulated depolarization currents (TSDC)This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license.-- et al.In the present work, the nematic glassy state of the non-symmetric LC dimer α-(4-cyanobiphenyl-4'-yloxy)-ω-(1-pyrenimine-benzylidene-4'-oxy) undecane is studied by means of calorimetric and dielectric measurements. The most striking result of the work is the presence of two different glass transition temperatures: one due to the freezing of the flip-flop motions of the bulkier unit of the dimer and the other, at a lower temperature, related to the freezing of the flip-flop and precessional motions of the cyanobiphenyl unit. This result shows the fact that glass transition is the consequence of the freezing of one or more coupled dynamic disorders and not of the disordered phase itself. In order to avoid crystallization when the bulk sample is cooled down, the LC dimer has been confined via the dispersion of γ-alumina nanoparticles, in several concentrations.The authors are grateful for financial support from the MICINN project MAT2012-38538-C01-02 and 03, the Gobierno Vasco (GI/IT-449-10), the Aragón Government and FSE (Project E04) and the Generalitat de Catalunya, Agència de Gestió d'Ajuts Universitaris i de Recerca (2009SGR1168).We acknowledge support by the CSIC Open Access Publication Initiative through its Unit of Information Resources for Research (URICI).Peer ReviewedMultidisciplinary Digital Publishing InstituteMinisterio de Ciencia e Innovación (España)Gobierno de AragónGeneralitat de CatalunyaEusko JaurlaritzaConsejo Superior de Investigaciones Científicas (España)Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2017201720152017info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/147838reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://dx.doi.org/10.3390/ma8063334Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/1478382026-05-22T06:33:51Z
dc.title.none.fl_str_mv Two glass transitions associated to different dynamic disorders in the nematic glassy state of a non-symmetric liquid crystal dimer dopped with γ-alumina nanoparticles
title Two glass transitions associated to different dynamic disorders in the nematic glassy state of a non-symmetric liquid crystal dimer dopped with γ-alumina nanoparticles
spellingShingle Two glass transitions associated to different dynamic disorders in the nematic glassy state of a non-symmetric liquid crystal dimer dopped with γ-alumina nanoparticles
Diez-Berart, Sergio
Dielectric spectroscopy
Liquid crystal
Dimer
Glass transition
Confinement
Nanoparticles
Modulated differential scanning calorimetry (MDSC)
Thermally stimulated depolarization currents (TSDC)
title_short Two glass transitions associated to different dynamic disorders in the nematic glassy state of a non-symmetric liquid crystal dimer dopped with γ-alumina nanoparticles
title_full Two glass transitions associated to different dynamic disorders in the nematic glassy state of a non-symmetric liquid crystal dimer dopped with γ-alumina nanoparticles
title_fullStr Two glass transitions associated to different dynamic disorders in the nematic glassy state of a non-symmetric liquid crystal dimer dopped with γ-alumina nanoparticles
title_full_unstemmed Two glass transitions associated to different dynamic disorders in the nematic glassy state of a non-symmetric liquid crystal dimer dopped with γ-alumina nanoparticles
title_sort Two glass transitions associated to different dynamic disorders in the nematic glassy state of a non-symmetric liquid crystal dimer dopped with γ-alumina nanoparticles
dc.creator.none.fl_str_mv Diez-Berart, Sergio
López, David O.
Robles-Hernández, Beatriz
Fuente, M. Rosario de la
Ros, M. Blanca
author Diez-Berart, Sergio
author_facet Diez-Berart, Sergio
López, David O.
Robles-Hernández, Beatriz
Fuente, M. Rosario de la
Ros, M. Blanca
author_role author
author2 López, David O.
Robles-Hernández, Beatriz
Fuente, M. Rosario de la
Ros, M. Blanca
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Ministerio de Ciencia e Innovación (España)
Gobierno de Aragón
Generalitat de Catalunya
Eusko Jaurlaritza
Consejo Superior de Investigaciones Científicas (España)
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Dielectric spectroscopy
Liquid crystal
Dimer
Glass transition
Confinement
Nanoparticles
Modulated differential scanning calorimetry (MDSC)
Thermally stimulated depolarization currents (TSDC)
topic Dielectric spectroscopy
Liquid crystal
Dimer
Glass transition
Confinement
Nanoparticles
Modulated differential scanning calorimetry (MDSC)
Thermally stimulated depolarization currents (TSDC)
description This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license.-- et al.
publishDate 2015
dc.date.none.fl_str_mv 2015
2017
2017
2017
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/147838
url http://hdl.handle.net/10261/147838
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv http://dx.doi.org/10.3390/ma8063334
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Multidisciplinary Digital Publishing Institute
publisher.none.fl_str_mv Multidisciplinary Digital Publishing Institute
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.81155

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