The dynamics of water molecules in ionic solution. ii. Quasi-elastic neutron scattering and tracer diffusion studies of the proton and ion dynamics in concentrated Ni2+, Cu2+and Nd3+aqueous solutions

P. S. Salmon, W. S. Howells, R. Mills

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For pt.I see ibid., vol.20, p.1573 (1987). The technique of high-resolution incoherent quasielastic neutron scattering (QENS) is used to measure the translational diffusive motion of water protons in concentrated NiX2, CuX2 and NdX3 aqueous solutions in which X=Cl, ClO4and/or NO3. The technique of tracer diffusion is also used in order to measure the cation selfdiffusion coefficient in concentrated NiX2 and CuX2 aqueous solutions in which X=Cland ClO4. It is shown that at room temperature (approximately=25 degrees C) the cation-water proton binding times are described by the limits tau 1(Ni2+)>or approximately=5*10-9s, tau 1(Cu2+)<or approximately=10-10s and tau 1(Nd3+)>10-10s and that for the Ni2+solutions, which are in slow exchange, the diffusion coefficient of protons bound to the cation is measurable using the QENS method.

Original languageEnglish
Pages (from-to)5727-5747
Number of pages21
JournalJournal of Physics C: Solid State Physics
Issue number34
Publication statusPublished - 10 Dec 1987

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Engineering(all)
  • Physics and Astronomy(all)

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