Quasielastic neutron scattering has been used to investigate the dynamical behavior of H2O in water/tert-butyl alcohol solutions. The measurements were made at fixed temperature (293 K) as a function of tert-butyl alcohol molar fraction, x, in the range 0–0.042. The data have been compared to those of pure water in the temperature range 269–293 K. The effect of tert-butyl alcohol addition on water dynamics is equivalent to that obtained by lowering the temperature of pure water by an amount proportional to the alcohol concentration. The temperature dependence of the diffusivity parameters in pure water and their concentration dependence in tert-butyl alcohol/water solutions can be rescaled to a common curve attributing to each solution a concentration-dependent “structural temperature” lower than the actual thermodynamic one. These results can be understood in terms of Stillinger’s picture of water structuring and of other more recent theoretical pictures that emphasize the influence of the geometrical properties of hydrogen bond networks on water mobility.

Diffusive dynamics of water in tert-butyl alcohol/water mixtures / Calandrini, V.; Deriu, Antonio; Onori, G.; Lechner, R. E.; Pieper, J.. - In: THE JOURNAL OF CHEMICAL PHYSICS. - ISSN 0021-9606. - 120:(2004), pp. 4759-4767. [10.1063/1.1645782]

Diffusive dynamics of water in tert-butyl alcohol/water mixtures

DERIU, Antonio;
2004-01-01

Abstract

Quasielastic neutron scattering has been used to investigate the dynamical behavior of H2O in water/tert-butyl alcohol solutions. The measurements were made at fixed temperature (293 K) as a function of tert-butyl alcohol molar fraction, x, in the range 0–0.042. The data have been compared to those of pure water in the temperature range 269–293 K. The effect of tert-butyl alcohol addition on water dynamics is equivalent to that obtained by lowering the temperature of pure water by an amount proportional to the alcohol concentration. The temperature dependence of the diffusivity parameters in pure water and their concentration dependence in tert-butyl alcohol/water solutions can be rescaled to a common curve attributing to each solution a concentration-dependent “structural temperature” lower than the actual thermodynamic one. These results can be understood in terms of Stillinger’s picture of water structuring and of other more recent theoretical pictures that emphasize the influence of the geometrical properties of hydrogen bond networks on water mobility.
2004
Diffusive dynamics of water in tert-butyl alcohol/water mixtures / Calandrini, V.; Deriu, Antonio; Onori, G.; Lechner, R. E.; Pieper, J.. - In: THE JOURNAL OF CHEMICAL PHYSICS. - ISSN 0021-9606. - 120:(2004), pp. 4759-4767. [10.1063/1.1645782]
File in questo prodotto:
File Dimensione Formato  
Abstracts - (3).doc

non disponibili

Tipologia: Abstract
Licenza: Creative commons
Dimensione 27.5 kB
Formato Microsoft Word
27.5 kB Microsoft Word   Visualizza/Apri   Richiedi una copia
J.Chem.Phys. 2004.pdf

non disponibili

Tipologia: Documento in Post-print
Licenza: NON PUBBLICO - Accesso privato/ristretto
Dimensione 743.3 kB
Formato Adobe PDF
743.3 kB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11381/1441205
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 28
  • ???jsp.display-item.citation.isi??? ND
social impact