dc.contributor.author | Díez Berart, Sergio | |
dc.contributor.author | López, David O. | |
dc.contributor.author | Salud, Josep | |
dc.contributor.author | Diego, José Antonio | |
dc.contributor.author | Sellarès, Jordi | |
dc.contributor.author | Robles Hernández, Beatriz | |
dc.contributor.author | De la Fuente Lavin, María Rosario | |
dc.contributor.author | Ros, María Blanca | |
dc.date.accessioned | 2016-04-14T14:52:34Z | |
dc.date.available | 2016-04-14T14:52:34Z | |
dc.date.issued | 2015-06 | |
dc.identifier.citation | Materials 8(6) : 3334-3351 (2015) | es |
dc.identifier.issn | 1996-1944 | |
dc.identifier.uri | http://hdl.handle.net/10810/17910 | |
dc.description.abstract | In the present work, the nematic glassy state of the non-symmetric LC dimer -(4-cyanobiphenyl-4-yloxy)--(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 -alumina nanoparticles, in several concentrations. | es |
dc.description.sponsorship | 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 Aragon Government and FSE (Project E04) and the Generalitat de Catalunya, Agencia de Gestio d'Ajuts Universitaris i de Recerca (2009SGR1168). The authors also thank the Nuclear Magnetic Resonance and Mass Spectra from the Instituto de Ciencia de Materiales de Aragon, Universidad de Zaragoza-CSIC (Spain) and the recognition from the Generalitat de Catalunya of GRPFM as Consolidated Research Group (2014-SGR-190). | es |
dc.language.iso | eng | es |
dc.publisher | MDPI | es |
dc.rights | info:eu-repo/semantics/openAccess | es |
dc.subject | liquid crystal | es |
dc.subject | dimer | es |
dc.subject | glass transition | es |
dc.subject | confinement | es |
dc.subject | nanoparticles | es |
dc.subject | modulated differential scanning calorimetry (MDSC) | es |
dc.subject | dielectric spectroscopy | es |
dc.subject | thermally stimulated depolarization currents (TSDC) | es |
dc.subject | phase-transitions | es |
dc.subject | dielectric-relaxation | es |
dc.subject | temperatures | es |
dc.subject | particles | es |
dc.subject | behavior | es |
dc.title | Two Glass Transitions Associated to Different Dynamic Disorders in the Nematic Glassy State of a Non-Symmetric Liquid Crystal Dimer Dopped with gamma-Alumina Nanoparticles | es |
dc.type | info:eu-repo/semantics/article | es |
dc.rights.holder | This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. | es |
dc.relation.publisherversion | http://www.mdpi.com/1996-1944/8/6/3334 | es |
dc.identifier.doi | 10.3390/ma8063334 | |
dc.departamentoes | Física aplicada II | es_ES |
dc.departamentoeu | Fisika aplikatua II | es_ES |
dc.subject.categoria | MATERIALS SCIENCE | |