Abstract
Using separate samples containing deuterated glucose and D2O, the motions of the glucose and the water molecules in the viscous liquid and in the amorphous glass phase of glucose/water mixtures are examined. Spin-lattice relaxation measurements and spectra obtained in the solid confirm the existence of both a crystalline ice phase and an amorphous glass phase. Diffusion measurements performed using the large gradient in the fringe field of a superconducting magnet determine the rates of translational motion of both the sugar and the water molecules over a limited range of temperature in the viscous liquid region. From the deuterium nuclear magnetic resonance spin-lattice relaxation time, T1, the spin-spin relaxation time, T2, and spin-alignment measurements, correlation times for the motion of these molecules are obtained. The correlation time for the α process increases dramatically at Tg, while the β process continues into the low temperature glass phase, following an approximately Arrhenius relationship.
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Dates
Type | When |
---|---|
Created | 23 years, 1 month ago (July 26, 2002, 8:20 a.m.) |
Deposited | 1 year, 6 months ago (Feb. 6, 2024, 8:24 a.m.) |
Indexed | 11 months, 3 weeks ago (Sept. 10, 2024, 4:30 a.m.) |
Issued | 26 years, 6 months ago (Feb. 15, 1999) |
Published | 26 years, 6 months ago (Feb. 15, 1999) |
Published Print | 26 years, 6 months ago (Feb. 15, 1999) |
@article{Moran_1999, title={A study of the molecular motion in glucose/water mixtures using deuterium nuclear magnetic resonance}, volume={110}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.478215}, DOI={10.1063/1.478215}, number={7}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Moran, G. R. and Jeffrey, K. R.}, year={1999}, month=feb, pages={3472–3483} }