YIN, Junjie; PEDERSEN, Christian; THEES, Michael; CARLSON, Andreas; SALEZ, Thomas; FORREST, James

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YIN, Junjie
University of Waterloo [Waterloo]

PEDERSEN, Christian
University of Oslo [UiO]

THEES, Michael
University of Waterloo [Waterloo]

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Article de revue

Ce document a été publié dans

Journal of Chemical Physics. 2023, vol. 158, p. 094901

American Institute of Physics

Résumé en anglais

We have studied the liquid-like response of the surface of vapour-deposited glassy films of polystyrene to the introduction of gold nanoparticles on the surface. The build-up of polymer material was measured as a function of time and temperature for both as-deposited films, as well as films that have been rejuvenated to become normal glasses cooled from the equilibrium liquid. The temporal evolution of the surface profile is well described by the characteristic power law of capillary-driven surface flows. In all cases, the surface evolution of the as-deposited films and the rejuvenated films are enhanced compared to bulk and are not easily distinguishable from each other. The temperature dependence of the measured relaxation times determined from the surface evolution is found to be quantitatively comparable to similar studies for high molecular weight spincast polystyrene. Comparisons to numerical solutions of the glassy thin film equation provide quantitative estimates of the surface mobility. For temperatures sufficiently close to the glass-transition temperature, particle embedding is also measured and used as a probe of bulk dynamics, and in particular bulk viscosity.< Réduire

Projet Européen

Brownian Motion near Soft Interfaces

Project ANR

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

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Unités de recherche

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