Blochowicz, Thomas ; Schramm, S. ; Lusceac, S. ; Vogel, Michael ; Stühn, B. ; Gutfreund, P. ; Frick, B. (2012)
Signature of a Type-A Glass Transition and Intrinsic Confinement Effects in a Binary Glass-Forming System.
In: Physical Review Letters, 109 (3)
doi: 10.1103/PhysRevLett.109.035702
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
We study dynamically highly asymmetric binary mixtures comprised of small methyl tetrahydrofuran (MTHF) molecules and polystyrene. Combined use of dielectric spectroscopy, H-2 nuclear magnetic resonance, incoherent quasielastic neutron scattering, and depolarized dynamic light scattering allows us to selectively probe the dynamics of the components in a broad dynamic range. It turns out that the mixtures exhibit two glass transitions in a wide concentration range although being fully miscible on a macroscopic scale. In between both glass transition temperatures, the dynamics of the small molecules show strong confinement effects, e. g., a crossover from Vogel-Fulcher to Arrhenius behavior of the time constants. Moreover, the dynamical behavior of small molecules close to the slow matrix is consistent with mode coupling theory predictions for a type-A glass transition, which was expected from recent theoretical and simulation studies in comparable systems.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2012 |
| Autor(en): | Blochowicz, Thomas ; Schramm, S. ; Lusceac, S. ; Vogel, Michael ; Stühn, B. ; Gutfreund, P. ; Frick, B. |
| Art des Eintrags: | Bibliographie |
| Titel: | Signature of a Type-A Glass Transition and Intrinsic Confinement Effects in a Binary Glass-Forming System |
| Sprache: | Englisch |
| Publikationsjahr: | 20 Juli 2012 |
| Ort: | ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA |
| Verlag: | APS Physics |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Physical Review Letters |
| Jahrgang/Volume einer Zeitschrift: | 109 |
| (Heft-)Nummer: | 3 |
| DOI: | 10.1103/PhysRevLett.109.035702 |
| Zugehörige Links: | |
| Kurzbeschreibung (Abstract): | We study dynamically highly asymmetric binary mixtures comprised of small methyl tetrahydrofuran (MTHF) molecules and polystyrene. Combined use of dielectric spectroscopy, H-2 nuclear magnetic resonance, incoherent quasielastic neutron scattering, and depolarized dynamic light scattering allows us to selectively probe the dynamics of the components in a broad dynamic range. It turns out that the mixtures exhibit two glass transitions in a wide concentration range although being fully miscible on a macroscopic scale. In between both glass transition temperatures, the dynamics of the small molecules show strong confinement effects, e. g., a crossover from Vogel-Fulcher to Arrhenius behavior of the time constants. Moreover, the dynamical behavior of small molecules close to the slow matrix is consistent with mode coupling theory predictions for a type-A glass transition, which was expected from recent theoretical and simulation studies in comparable systems. |
| Zusätzliche Informationen: | Art.No.: 035702 |
| Fachbereich(e)/-gebiet(e): | 05 Fachbereich Physik 05 Fachbereich Physik > Institut für Festkörperphysik (2021 umbenannt in Institut für Physik Kondensierter Materie (IPKM)) 05 Fachbereich Physik > Institut für Festkörperphysik (2021 umbenannt in Institut für Physik Kondensierter Materie (IPKM)) > Struktur und Dynamik amorpher Systeme |
| Hinterlegungsdatum: | 20 Aug 2012 07:31 |
| Letzte Änderung: | 09 Jul 2021 13:01 |
| PPN: | |
| Sponsoren: | Deutsche Forschungsgemeinschaft; FOR 1583, BL 923/1 |
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