Condensed Matter Physics, 2013, vol. 16, No. 4, 43601:1-12
Selective adsorption of ions in charged slit-systems
(Department of Physical Chemistry, University of Pannonia, P. O. Box 158, Veszprem, Hungary)
(Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT, USA)
(Department of Physical Chemistry, University of Pannonia, P. O. Box 158, Veszprem, Hungary; Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT, USA)
We study the selective adsorption of various cations into a layered slit system using grand canonical Monte Carlo simulations. The slit system is formed by a series of negatively charged membranes. The electrolyte contains two kinds of cations with different sizes and valences modeled by charged hard spheres immersed in a continuum dielectric solvent. We present results for various cases depending on the combinations of the properties of the competing cations. We concentrate to the case when the divalent cations are larger than the monovalent cations. In this case, size and charge have counterbalancing effects, which results in interesting selectivity phenomena.
Monte Carlo, primitive model electrolytes, slits, selectivity
61.20.Qg, 68.03.-g, 81.05.Rm, 61.20.Ja, 07.05.Tp