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Dielectric Relaxation in Small Confining Geometries

Published online by Cambridge University Press:  15 February 2011

M. Arndt  and
F. Kremer
M. Arndt
Affiliation:
Universität Leipzig, Linnéstr. 5 04103 Leipzig, Germany
F. Kremer
Affiliation:
Universität Leipzig, Linnéstr. 5 04103 Leipzig, Germany
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Abstract

Broadband dielectric spectroscopy (10−2 Hz – 109 Hz) is employed to study the molecular dynamics of the glassforming liquid salol (phenyl salicylate) being contained in (dielectric inactive) porous glasses with pore sizes of about 2.5 nm, 5.0 nm and 7.5 nm. Besides the bulk relaxation (I) of salol, two further dielectric loss processes are observed due to the geometrical constraint of the inner surfaces of the pores: the “interfacial relaxation” (II) and a Maxwell-Wagner polarization (III). The “interfacial relaxation” is assigned to the restricted dynamics of the molecules close to the inner surface of the pores. It shows a strong pore-size dependence for pores < 5 nm both in relaxation rate and dielectric strength.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 366: Symposium N – Dynamics in Small Confining Systems , 1994 , 259
Copyright
Copyright © Materials Research Society 1995

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