56247 20210121114520.0 doi 10.3390/ma8063334 sideral 90676 ART-2015-90676 eng Diez-Berart, Sergio 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 2015 Access copy available to the general public Unrestricted In the present work, the nematic glassy state of the non-symmetric LC dimer a-(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. info:eu-repo/grantAgreement/ES/DGA/E04 info:eu-repo/grantAgreement/ES/MINECO/MAT2012-38538-C01-02 info:eu-repo/semantics/openAccess by http://creativecommons.org/licenses/by/3.0/es/ 2.728 2015 MATERIALS SCIENCE, MULTIDISCIPLINARY 63 / 271 = 0.232 2015 Q1 T1 0.83 2015 Materials Science (miscellaneous) 2015 Q1 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion López, David.O. Salud, Josep Diego, José Antonio Sellarés, Jordi Robles-Hernández, Beatriz De la Fuente, M.Rosario (orcid)0000-0003-4416-1036 Ros, M.Blanca Universidad de Zaragoza 2013 765 Universidad de Zaragoza Dpto. Química Orgánica Área Química Orgánica 8, 6 (2015), 3334-3351 MATERIALS MATERIALS 1996-1944 856565 http://zaguan.unizar.es/record/56247/files/texto_completo.pdf Versión publicada 94069 http://zaguan.unizar.es/record/56247/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:56247 articulos driver 2021-01-21-11:02:13 ARTICLE