Effects of concentration on the microwave dielectric spectra of aqueous urea solutions
- Authors: Lyashchenko A.K.1, Dunyashev V.S.1, Zasetsky A.Y.1
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Affiliations:
- Kurnakov Institute of General and Inorganic Chemistry
- Issue: Vol 91, No 5 (2017)
- Pages: 887-893
- Section: Physical Chemistry of Solutions
- URL: https://journals.rcsi.science/0036-0244/article/view/169476
- DOI: https://doi.org/10.1134/S0036024417050168
- ID: 169476
Cite item
Abstract
Several models of relaxation for the dielectric spectra of aqueous urea solutions in the microwave region are compared. The spectra are shown to contain two main Debye components arising from the rotational motions of urea and water molecules. Two essentially different concentration regions in urea solutions are identified. The first is characterized by a small increase in the mobility of water molecules (τ1 = 7.8 ps) and the existence of hydrated urea molecules (τ2 = 19 ps). Due to the aggregation of urea molecules, the relaxation times for the latter process grow considerably in highly concentrated solutions. At the same time, faster molecular motions (τ3 = 6 ps) are observed for water molecules.
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About the authors
A. K. Lyashchenko
Kurnakov Institute of General and Inorganic Chemistry
Author for correspondence.
Email: aklyas@mail.ru
Russian Federation, Moscow, 119991
V. S. Dunyashev
Kurnakov Institute of General and Inorganic Chemistry
Email: aklyas@mail.ru
Russian Federation, Moscow, 119991
A. Yu. Zasetsky
Kurnakov Institute of General and Inorganic Chemistry
Email: aklyas@mail.ru
Russian Federation, Moscow, 119991