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Ions in Mixed Dielectric Solvents: Density Profiles and Osmotic Pressure between Charged Dan Ben-Yaakov and David Andelman*
 

Summary: Ions in Mixed Dielectric Solvents: Density Profiles and Osmotic Pressure between Charged
Interfaces
Dan Ben-Yaakov and David Andelman*
Raymond and BeVerly Sackler School of Physics and Astronomy, Tel AViV UniVersity,
Ramat AViV, Tel AViV 69978, Israel
Daniel Harries
Institute of Chemistry and The Fritz Haber Research Center, The Hebrew UniVersity, Jerusalem 91904, Israel
Rudi Podgornik
Department of Theoretical Physics, J. Stefan Institute, and Department of Physics, Faculty of Mathematics and
Physics, UniVersity of Ljubljana, 1000 Ljubljana, SloVenia, and Laboratory of Physical and Structural Biology,
Eunice Kennedy ShriVer National Institute of Child Health and Human DeVelopment, National Institutes of
Health, Bethesda, Maryland 20814-0924
ReceiVed: January 13, 2009; ReVised Manuscript ReceiVed: February 7, 2009
The forces between charged macromolecules, usually given in terms of osmotic pressure, are highly affected
by the intervening ionic solution. While in most theoretical studies the solution is treated as a homogeneous
structureless dielectric medium, recent experimental studies concluded that, for a bathing solution composed
of two solvents (binary mixture), the osmotic pressure between charged macromolecules is affected by the
binary solvent composition. By adding local solvent composition terms to the free energy, we obtain a general
expression for the osmotic pressure, in planar geometry and within the mean-field framework. The added
effect is due to the permeability inhomogeneity and nonelectrostatic short-range interactions between the

  

Source: Andelman, David - School of Physics and Astronomy, Tel Aviv University

 

Collections: Materials Science; Physics