Thermodynamic, structural, and nanomechanical properties of a fluorous biphasic material

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dc.contributor.authorNunez, E.en
dc.contributor.authorClark, C. G.en
dc.contributor.authorCheng, W.en
dc.contributor.authorBest, A.en
dc.contributor.authorFloudas, G.en
dc.contributor.authorSemenov, A. N.en
dc.contributor.authorFytas, G.en
dc.contributor.authorMullen, K.en
dc.date.accessioned2015-11-24T18:28:56Z
dc.date.available2015-11-24T18:28:56Z
dc.identifier.issn1520-6106-
dc.identifier.urihttps://olympias.lib.uoi.gr/jspui/handle/123456789/16206
dc.rightsDefault Licence-
dc.subjectsemifluorinated normal-alkanesen
dc.subjectsurface micellesen
dc.subjectphaseen
dc.subject(perfluoroalkyl)alkanesen
dc.subjecttransitionsen
dc.subjectbehavioren
dc.subjectsolventen
dc.subjectfilmsen
dc.subjectmeltsen
dc.titleThermodynamic, structural, and nanomechanical properties of a fluorous biphasic materialen
heal.abstractThe dynamics of the amphiphilic semifluorinated F(CF2)(12)(CH2)(12)H (F12H12) alkane that undergoes two condensed phase transitions have been investigated by Brillouin light spectroscopy, shear rheometry, small(SAXS) and wide-angle (WAXS) X-ray scattering, and thermodynamic PVT measurements. The solid (I)-solid (II) transition (T,) is marked by a stronger temperature dependence of the sound velocity in phase II and by a 2 orders of magnitude drop of the shear modulus. Between the T, and the melting transition (T-m), the presence of two phonons implies a coexistence of solid (II) and amorphous (liquid) regions in the submicrometer range at thermal equilibrium as revealed by the SAXS pattern of a single reflection superimposed on a very broad amorphous halo. This intriguing finding of a transient, very slow (over 10 h) solid/liquid coexistence within phase II is rationalized by a two-stage mechanism for melting of the smectic phase (II) of F12H12. A refinement of the known packing motifs for the two solid-state structures is proposed.en
heal.accesscampus-
heal.fullTextAvailabilityTRUE-
heal.identifier.primaryDoi 10.1021/Jp711945z-
heal.identifier.secondary<Go to ISI>://000256055400003-
heal.identifier.secondaryhttp://pubs.acs.org/doi/pdfplus/10.1021/jp711945z-
heal.journalNameJournal of Physical Chemistry Ben
heal.journalTypepeer reviewed-
heal.languageen-
heal.publicationDate2008-
heal.recordProviderΠανεπιστήμιο Ιωαννίνων. Σχολή Επιστημών και Τεχνολογιών. Τμήμα Βιολογικών Εφαρμογών και Τεχνολογιώνel
heal.typejournalArticle-
heal.type.elΆρθρο Περιοδικούel
heal.type.enJournal articleen

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