Heterogeneous relaxation dynamics of nano-confined salol probed by DMA

Author(s)
Wilfried Schranz, Madalina-Roxana Puica, Johannes Koppensteiner, Heinz Kabelka, A. V. Kityk
Abstract

We present novel low-frequency (0.1 Hz–50 Hz) measurements of the

complex elastic susceptibility of the glass-forming liquid salol

confined to nanoporous Vycor glass. Our data can be perfectly

interpreted with the assumption of a radial distribution of

Vogel-Fulcher temperatures T0(r) inside the

pores, resulting from an increase of the molecular relaxation time with

decreasing distance from the rough pore surface as recently found by

computer simulations (Scheidler et al., Europhys. Lett. 59,

701 (2002)). The results show for the first time, that the dynamic

elastic response is extremely sensitive for separating

confinement-induced acceleration effects of the molecular dynamics and

surface-induced slowing-down due to rough pore interfaces.

Organisation(s)
Physics of Functional Materials, Physics of Nanostructured Materials
External organisation(s)
Czestochowa University of Technology (CUT)
Journal
Europhysics Letters
Volume
79
No. of pages
6
ISSN
0295-5075
DOI
https://doi.org/10.1209/0295-5075/79/36003
Publication date
2007
Peer reviewed
Yes
Austrian Fields of Science 2012
103018 Materials physics
Portal url
https://ucris.univie.ac.at/portal/en/publications/heterogeneous-relaxation-dynamics-of-nanoconfined-salol-probed-by-dma(ac75f6ed-c882-4e00-8bd3-e517ab52bc29).html