Volume 64, Number 5, December 2003
|Page(s)||675 - 681|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 November 2003|
Confinement effects on the excess wing in the dielectric loss of glass-formers
Department of Applied Physics, Chalmers University of Technology SE-412 96 Göteborg, Sweden
Corresponding author: email@example.com
Accepted: 16 September 2003
We present results from dielectric spectroscopy on four molecular glass-formers, both in bulk and in confined geometry. For systems exhibiting a well-resolved secondary (β) relaxation, the confinement induces a relative enhancement (compared to the main α relaxation) of the effective dielectric strength of the β process. In bulk systems without a well-separated β process a similar relative enhancement is found also for the contribution to the dielectric loss identified as the excess wing. The latter effect results in a bimodal loss, which suggests that the excess wing should be attributed to a relaxation process separate from, and thus not a feature of, the α relaxation. The results hence provide an explanation for the much debated excess wing often observed in the dielectric response of glass-formers.
PACS: 64.70.Pf – Glass transitions / 77.22.Gm – Dielectric loss and relaxation
© EDP Sciences, 2003
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.