KARIMI, Saba; YIN, Junjie; SALEZ, Thomas; FORREST, James

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KARIMI, Saba

YIN, Junjie

SALEZ, Thomas
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

Langue

Document de travail - Pré-publication

Résumé en anglais

We measure the isothermal rejuvenation of stable glass films of poly(styrene) and poly(methylmethacrylate). We demonstrate that the propagation of the front responsible for the transformation to a supercooled-liquid state can serve as a highly localized probe of the local supercooled dynamics. We use this connection to probe the depth-dependent relaxation rate with nanometric precision for a series of polystyrene films over a range of temperatures near the bulk glass transition temperature. The analysis shows the spatial extent of enhanced surface mobility and reveals the existence of an unexpected large dynamical length scale in the system. The results are compared with the cooperative-string model for glassy dynamics. The data reveals that the film-thickness dependence of whole film properties arises only from the volume fraction of the near-surface region. While the dynamics at the middle of the samples shows the expected bulk-like temperature dependence, the near-surface region shows very little dependence on temperature.< Réduire

URI

https://oskar-bordeaux.fr/handle/20.500.12278/186555

Projet Européen

Brownian Motion near Soft Interfaces

Project ANR

Mouvement brownien au voisinage d'interfaces molles - ANR-21-ERCC-0010
Frottements dans les systèmes complexes - ANR-21-CE06-0039
Capteur Interférométrique de Contraintes de Surface - ANR-21-CE06-0029

Origine

Importé de hal

Unités de recherche

Laboratoire Ondes et Matière d'Aquitaine (LOMA) - UMR 5798