Dielectric secondary relaxation of water in aqueous binary glass-formers
Artikel i vetenskaplig tidskrift, 2010

Glassy aqueous binary mixtures generally exhibit a water induced dielectric relaxation. The characteristic time-scale of this relaxation follows an Arrhenius temperature dependence with a nearly universal activation energy. We here demonstrate for a series of model aqueous mixtures that the relaxation time also follows a remarkably general exponential dependence on the weight fraction of water. By comparison to literature data we show that this behaviour is shared by a wide range of molecular systems. Neither the detailed nature of the water molecules' glassy environment nor the details of the route of formation of the glassy state has a significant effect on the observed behaviour.

polymers

mixtures

spectroscopy

goldstein beta-relaxation

dynamics

Författare

Johan Sjöström

Chalmers, Teknisk fysik, Kondenserade materiens fysik

Johan Mattsson

Chalmers, Teknisk fysik, Kondenserade materiens fysik

Rikard Bergman

Chalmers, Teknisk fysik, Kondenserade materiens fysik

Erik Johansson

Chalmers, Teknisk fysik, Kondenserade materiens fysik

Karin Josefsson

Chalmers, Teknisk fysik, Kondenserade materiens fysik

David Svantesson

Chalmers, Teknisk fysik, Kondenserade materiens fysik

Jan Swenson

Chalmers, Teknisk fysik, Kondenserade materiens fysik

Physical Chemistry Chemical Physics

1463-9076 (ISSN) 1463-9084 (eISSN)

Vol. 12 10452-10456

Ämneskategorier

Fysik

DOI

10.1039/c001275k