Identification of the Molecular Motions Responsible for the Slower Secondary (β) Relaxation in Sucrose

Broad-band isothermal dielectric relaxation measurements of anhydrous sucrose were made at ambient pressure in its liquid and glassy states. We found a new secondary relaxation that is slower than the one commonly observed in sugars. Additionally, we carried out the dielectric measurements of the eq...

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Bibliographic Details
Published in:The journal of physical chemistry. B 2008-06, Vol.112 (25), p.7662-7668
Main Authors: Kaminski, K, Kaminska, E, Hensel-Bielowka, S, Chelmecka, E, Paluch, M, Ziolo, J, Wlodarczyk, P, Ngai, K. L
Format: Article
Language:English
Subjects:
B: Biophysical Chemistry
Computer Simulation
Electrons
Molecular Structure
Motion
Sucrose - chemistry
Temperature
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Summary:Broad-band isothermal dielectric relaxation measurements of anhydrous sucrose were made at ambient pressure in its liquid and glassy states. We found a new secondary relaxation that is slower than the one commonly observed in sugars. Additionally, we carried out the dielectric measurements of the equimolar mixture of d-glucose and d-fructose in wide ranges of temperature and frequency. Comparison of the behavior of these two systems allowed us to make suggestions on the origin of the slower β-relaxation in sucrose. Computer simulations and coupling model calculations were performed to support our interpretation of the kind of molecular motions responsible for the slower secondary relaxation in the disaccharide considered.
ISSN:1520-6106
1520-5207
DOI:10.1021/jp711502a