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The Structure of a Supersaturated Solution: A Neutron Scattering Study of Aqueous Urea

Burton, R. C., Ferrari, E. S., Davey, R. J., Hopwood, Jeremy D., Quayle, M. J., Finney, J. L. and Bowron, D. T. (2008) The Structure of a Supersaturated Solution: A Neutron Scattering Study of Aqueous Urea. Crystal Growth and Design, 8 (5). pp. 1559-1565. ISSN 1528-7483

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In this study a combination of neutron diffraction measurements and empirical potential structure refinement (EPSR)
was used to investigate the time-averaged structure of a 0.30 mol fraction solution of urea in water at both 25 and 35 °C. These two
temperatures were chosen in order to compare the structure of an undersaturated solution at 35 °C with that of a supersaturated
solution at 25 °C. The results indicate that in moving into the supersaturated state the solutions show a significant and unexpected
change in the self-aggregation of urea molecules. Urea-urea interactions present in the undersaturated solution become suppressed
in the supersaturated region, in favor of interactions between urea and water so that overall the urea becomes more hydrated. Such
a change may be viewed as a response of the system to the imposed supersaturation and a factor playing an important role in the
observed metastability of the solutions.

Item Type: Article
Subjects: Q Science > Q Science (General)
Q Science > QD Chemistry
Schools: School of Applied Sciences
Related URLs:
Depositing User: Jeremy Hopwood
Date Deposited: 05 Dec 2016 15:03
Last Modified: 28 Aug 2021 12:11


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