http://www.cnr.it/ontology/cnr/individuo/prodotto/ID180393
Hydrophobic hydration of tert-butyl alcohol studied by Brillouin light and inelastic ultraviolet scattering (Articolo in rivista)
- Type
- Label
- Hydrophobic hydration of tert-butyl alcohol studied by Brillouin light and inelastic ultraviolet scattering (Articolo in rivista) (literal)
- Anno
- 2011-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1063/1.3529014 (literal)
- Alternative label
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- L. Lupi;1 L. Comez;1,2 C. Masciovecchio;3 A. Morresi;4 M. Paolantoni;4 P. Sassi;4
F. Scarponi;1 and D. Fioretto1 (literal)
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- Rivista
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- Note
- ISI Web of Science (WOS) (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- 1Dipartimento di Fisica, Università degli Studi di Perugia, Via Pascoli, I-06123 Perugia, Italy
2IOM-CNR, c/o Dipartimento di Fisica, Università di Perugia, Via Pascoli, I-06123 Perugia, Italy
3Sincrotrone Trieste, Area Science Park, S.S 14, Km 163,5, Basovizza, I-34012 Trieste, Italy
4Dipartimento di Chimica, Università di Perugia, via Elce di Sotto, I-06123 Perugia, Italy (literal)
- Titolo
- Hydrophobic hydration of tert-butyl alcohol studied by Brillouin light and inelastic ultraviolet scattering (literal)
- Abstract
- The longitudinal viscosity of diluted water-tert-butyl alcohol solutions in the 10 GHz frequency region
has been measured by means of Brillouin light scattering and inelastic ultraviolet scattering.
The main advantage of our hypersonic investigation compared to more traditional ultrasonic measurements
is that in the gigahertz frequency range slow relaxation processes involving the alcohol
dynamics are completely unrelaxed, so that the measured viscosity mainly originates from the hydrogen
bond restructuring of water. In contrast with previous determinations, we estimate an activation
energy which is independent from the alcohol mole fraction up to X = 0.1, and comparable to that of
bulk water. A simple two-component model is used to describe the steep increase of viscosity with
increasing alcohol mole fraction, and a retardation factor 1.7 ± 0.2 is found between the relaxation
times of hydration and bulk water. These findings endorse a dynamic scenario where the slowing
down of hydration water is mainly due to a reduction of configurational entropy and does not involve
an arrested, icelike, dynamics. (literal)
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