Central Technological Library of the University of Ljubljana (CTK)
  • Ion partitioning between charged micropores and bulk electrolyte solution. mixtures of mono- and divalent counterions and monovalent co-ions
    Jamnik, Brigita, 1966- ; Vlachy, Vojko
    The exclusion of mixed electrolytes from charged and uncharged cylindrical capillaries is studied using the grand canonical Monte Carlo method and Poisson-Boltzmann equation. Concentration profiles ... inside the capillary, the Donnan exclusion coefficient, the separation factor, and concentration fluctiations were evaluated for a system with a mixture of divalent and monovalent counterions and monovalent co-ions. The electrolyte is treated in the restrictive primitive model aproximation. All these quantities are studied as a function of the composition of the bulk external electrolyte. The calculations apply to a range of surface charge densities and to two values of the total ionic strength. The simulation results are compared with the predictions of the Poisson-Boltzmann approximation and the ideal Donnan theory. Both approximate theories grossly overestimate the ability of micropore to exclude electroytes. For higher concentrations of divalent counterions present in the system the Poisson-Boltzmann theory yields incorrect results. We present a comparison with the experimental data for charged membranes immersed in a mixed ▫$KCl/CaCl_3$▫ solution.
    Source: Journal of the American Chemical Society : JACS. - ISSN 0002-7863 (Vol. 117, 1995, str. 8010-8016)
    Type of material - article, component part
    Publish date - 1995
    Language - english
    COBISS.SI-ID - 18512133

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