Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2006-04-09
Phys. Rev. E 74, 021506 (2006)
Physics
Condensed Matter
Soft Condensed Matter
8 pages, 3 figures, Submitted to Phys. Rev. E
Scientific paper
10.1103/PhysRevE.74.021506
Supercooled liquid and glassy acetyl salicylic acid was studied using dielectric spectroscopy and deuteron relaxometry in a wide temperature range. The supercooled liquid is characterized by major deviations from thermally activated behavior. In the glass the secondary relaxation exhibits the typical features of a Johari-Goldstein process. Via measurements of spin-lattice relaxation times the selectively deuterated methyl group was used as a sensitive probe of its local environments. There is a large difference in the mean activation energy in the glass with respect to that in crystalline acetyl salicylic acid. This can be understood by taking into account the broad energy barrier distribution in the glass.
Böhmer Roland
Goresy T. El
Nath Rajender
Zimmermann Horst
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