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

No. of pages

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

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