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Article Dans Une Revue Journal of Chemical Physics Année : 2012

Influence of monovalent ions on density fluctuations in hydrothermal aqueous solutions by small angle X-ray scattering

Résumé

Synchrotron small angle X-ray scattering measurements on water and alkaline bromine aqueous solutions (XBr, with X = Li, Rb, or Cs) were carried out from ambient to supercritical conditions. The temperature was increased from 300 to 750 K along several isobars between 24 and 35 MPa. The correlation length and the structure factor were extracted from the data following the Ornstein-Zernike formalism. We obtained experimental evidence of the shift of the critical point and isochore and their dependence on the ions concentration (0.33 mol/kg and 1.0 mol/kg). We also observed that the size of the density fluctuations and the structure factor increase with the presence of the ions and that this effect is positively correlated with the atomic number of the cation. These behaviors were compared with ZnBr2 and NaCl systems from the literature.
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Dates et versions

hal-00761252 , version 1 (05-12-2012)

Identifiants

Citer

Cécile da Silva-Cadoux, Jean-Louis Hazemann, Denis Testemale, Olivier Proux, Cyrille Rochas. Influence of monovalent ions on density fluctuations in hydrothermal aqueous solutions by small angle X-ray scattering. Journal of Chemical Physics, 2012, 136 (4), pp.044515. ⟨10.1063/1.3679021⟩. ⟨hal-00761252⟩
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