Tielrooij, Klaas-Jan and Hunger, Johannes and Buchner, Richard and Bonn, Mischa and Bakker, Huib J. (2010) Influence of Concentration and Temperature on the Dynamics of Water in the Hydrophobic Hydration Shell of Tetramethylurea. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 132 (44). pp. 15671-15678. ISSN 0002-7863,
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We study the influence of the amphipilic compound tetramethylurea (TMU) on the dynamical properties of water, using dielectric relaxation spectroscopy in the regime between 0.2 GHz and 2 THz. This technique is capable of resolving different water species, their relative fractions, and their corresponding reorientation dynamics. We find that the reorientation dynamics of water molecules in the hydration shell of the hydrophobic groups of TMU is between 3 (at low concentrations) and 10 (at higher concentrations) times slower than the dynamics of bulk water. The data indicate that the effect of hydrophobic groups on water is strong but relatively short-ranged. With increasing temperature, the fraction of water contained in the hydrophobic hydration shell decreases, which implies that the overall effect of hydrophobic groups on water becomes smaller.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | TIME-DOMAIN SPECTROSCOPY; DIELECTRIC-RELAXATION; AQUEOUS-SOLUTIONS; REFLECTION SPECTROSCOPY; LIQUID WATER; REORIENTATION; BEHAVIOR; SIMULATION; SOLUTES; UREA; |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry VI - Physical Chemistry (Solution Chemistry) > PD Dr. Richard Buchner |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 06 Jul 2020 12:25 |
| Last Modified: | 06 Jul 2020 12:25 |
| URI: | https://pred.uni-regensburg.de/id/eprint/23882 |
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