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Small angle neutron scattering, total cross-sections and mass density measurements of concentrated NaCl and KCl solutions in H2O or D2O

Biophysical Chemistry
Publication Date
DOI: 10.1016/0301-4622(94)00077-8
  • Densimetry
  • Neutron Scattering
  • Salt Solutions
  • Nacl
  • Kcl
  • Cold Neutrons


Abstract The mass densities, total cold neutron cross sections and small angle scattering of concentrated NaCl and KCl solutions in H 2O or D 2O ( 2H 2O) were measured at 20°C. The partial specific volumes of both salts increase with salt concentration and are significantly smaller in D 2O than in H 2O, showing that these salt solutions cannot be considered as isomorphous in H 2O and D 2O. As salt concentration increases for both salts, the total coherent cross sections for neutrons of the solutions also increase while the coherent small angle scattering decreases—observations that are consistent, respectively, with increasing correlations involving the ion and water components and a decrease in the particle number density and/or concentration fluctuations, in the solutions. Changes in incoherent scattering with salt concentration are essentially those expected from the solution compositions and densities.

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