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
  • 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 (2011)
    Hydrophobic hydration of tert-butyl alcohol studied by Brillouin light and inelastic ultraviolet scattering
    in The Journal of chemical physics
    (literal)
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)
Pagina inizio
  • 055104-1 (literal)
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  • 134 (literal)
Rivista
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  • 6 (literal)
Note
  • ISI Web of Science (WOS) (literal)
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  • 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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