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Journal Article

The Membrane/Water Partition Coefficients of Ions: Electrostatic Calculations of Dielectric Heterogeneity

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Anderson,  James E.
Department of Physical Chemistry, Max Planck Institute of Biophysics, Max Planck Society;
Scientific Research Staff, Ford Motor Company, Dearborn, Michigan 48105, USA;

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Pusch,  Wolfgang
Department of Physical Chemistry, Max Planck Institute of Biophysics, Max Planck Society;

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Citation

Anderson, J. E., & Pusch, W. (1976). The Membrane/Water Partition Coefficients of Ions: Electrostatic Calculations of Dielectric Heterogeneity. Berichte der Bunsen-Gesellschaft, 80(9), 846-849. doi:10.1002/bbpc.19760800905.


Cite as: https://hdl.handle.net/21.11116/0000-000A-5465-6
Abstract
A continuum electrostatic calculation explores dielectric heterogeneity in membranes and its influence on ion sorption. The spherical shell model of Ullman is used. A transition in predicted sorption behaviour occurs as b, the mean ionic radius, becomes comparable with L, the size of dielectric domains. Since the finite size of molecules establishes a lower limit of L ˜ b, it is likely that no membrane is a strictly homogeneous dielectric from the standpoint of ion sorption. The calculation predicts that changing the dielectric domain size between 5 · 10−8 and 20 · 10−8 cm has a drastic effect on ion sorption. Objections which can arise from the very special nature of Ullman's model are discussed.