Pressure effect on water dynamics in tert-butyl alcohol/water solutions (Articolo in rivista)

Type
Label
  • Pressure effect on water dynamics in tert-butyl alcohol/water solutions (Articolo in rivista) (literal)
Anno
  • 2006-01-01T00:00:00+01:00 (literal)
Alternative label
  • Calandrini, V; Deriu, A; Onori, G; Paciaroni, A; Telling, MTF (2006)
    Pressure effect on water dynamics in tert-butyl alcohol/water solutions
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Calandrini, V; Deriu, A; Onori, G; Paciaroni, A; Telling, MTF (literal)
Pagina inizio
  • S2363 (literal)
Pagina fine
  • S2371 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 18 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • CEA Saclay, CNRS, Lab Leon Brillouin, F-91191 Gif Sur Yvette, France; Univ Parma, Dipartimento Fis, I-43100 Parma, Italy; CNISM, I-43100 Parma, Italy; Univ Perugia, Dipartimento Fis, CNR, INFM CRS Soft Unita, I-06100 Perugia, Italy; Univ Perugia, CEMIN, I-06100 Perugia, Italy; Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon, England (literal)
Titolo
  • Pressure effect on water dynamics in tert-butyl alcohol/water solutions (literal)
Abstract
  • We report here a quasi-elastic neutron scattering (QENS) investigation of the effect of pressure on the diffusivity properties of water in a dilute aqueous solution of hydrophobic molecules (tert-butyl alcohol, TBA). The experiment was performed at fixed TBA concentration (0.02 molar fraction) by varying pressure from 1 to 2000 bar at two different temperatures ( 268 and 278 K). The quasi-elastic line-shapes have been analysed in terms of a model based on the memory function formalism. Our data indicate that, on increasing pressure up to 2000 bar, the diffusion coefficient of water in the TBA/water mixture exhibits a relative increase larger than that of pure water under the same thermodynamic conditions. The extent of this effect increases with decreasing temperature. The observed behaviour is described in terms of pressure-induced distortions of the H-bonded random network of liquid water. (literal)
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