Authors: Böhmer, Roland
Nath, R.
Geil, B.
Nowaczyk, A.
Title: 2H-NMR studies of supercooled and glassy aspirin
Language (ISO): en
Abstract: Acetyl salicylic acid, deuterated at the methyl group, was investigated using 2H NMR in its supercooled and glassy states. Just above the glass transition temperature the molecular reorientations, studied using stimulated-echo spectroscopy, demonstrated a large degree of similarity with other glass formers. Deep in the glassy phase the NMR spectra look similar to those reported for the crystal and below 20 K they are indicating that rotational tunneling plays a role. Measurements of the spin-lattice relaxation times for temperatures below 150 K reveal a broad distribution of correlation times in the glass. The dominant energy barrier characterizing the slow-down of the methyl group motion is significantly lower than the well-defined barrier in the crystal.
Subject Headings: Glass transition
Nuclear magnetic (and quadrupole) resonance
URI: http://hdl.handle.net/2003/25506
http://dx.doi.org/10.17877/DE290R-2964
Issue Date: 2007
Rights: Copyright © 2007 Elsevier B.V. All rights reserved.
Publisher: Elsevier
URL: http://dx.doi.org/10.1016/j.jnoncrysol.2007.05.180
Citation: Nath, R.; Geil, B.; Nowaczyk, A.; Böhmer, R.: 2H-NMR studies of supercooled and glassy aspirin. In: Journal of Non-Crystalline Solids Nr. 41-43, Jg. 353(2007), S. 3788-3795, doi: 10.1016/j.jnoncrysol.2007.05.180.
Appears in Collections:Böhmer, Roland Prof. Dr.

Files in This Item:
There are no files associated with this item.


This item is protected by original copyright



All resources in the repository are protected by copyright.