Prof. Dr. James Forrest "The glass transition of polymers in confined geometries"
Department of Physics and Astronomy of the University of Waterloo, Ontario, Canada
What |
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When |
Mar 14, 2016 from 03:15 PM to 04:00 PM |
Where | Seminarraum A, FMF, Stefan-Meier-Str. 21, Freiburg |
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For over 20 years now, there has been significant interest on the properties of highly confined glass formers. In particular, measurements of the glass transition temperature (Tg) and related dynamics have sometimes shown significant differences from the properties of bulk materials. In this talk we will review the literature, and describe a simple physical picture that allows one to describe the measurements of apparently reduced Tg values in both thin films, and nano spheres. We will then introduce a simple free volume model for dynamics in glass forming materials where the importance of dynamical length scale is explicitly derived. That model is found to provide an excellent description of bulk and confined glass formers.
invited by Jörg Baschnagel