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THE JOURNAL OF CHEMICAL PHYSICS 134, 074705 (2011) Dielectric decrement as a source of ion-specific effects
 

Summary: THE JOURNAL OF CHEMICAL PHYSICS 134, 074705 (2011)
Dielectric decrement as a source of ion-specific effects
Dan Ben-Yaakov,1
David Andelman,1,a)
and Rudi Podgornik2
1
Raymond and Beverly Sackler School of Physics and Astronomy Tel Aviv University, Ramat Aviv,
Tel Aviv 69978, Israel
2
Department of Theoretical Physics J. Stefan Institute, Department of Physics Faculty of Mathematics and
Physics and Institute of Biophysics Medical Faculty, University of Ljubljana 1000 Ljubljana, Slovenia
(Received 1 November 2010; accepted 11 January 2011; published online 17 February 2011)
Many theoretical studies were devoted in the past to ion-specific effects trying to interpret a large
body of experimental evidence, such as surface tension at air/water interfaces and force measure-
ments between charged objects. Although several mechanisms were suggested to explain the results,
such as dispersion forces and specific surface-ion interactions, we would like to suggest another
source of ion-specificity originating from the local variations of the dielectric constant due to the
presence of ions in the solution. We present a mean-field model to account for the heterogeneity of
the dielectric constant caused by the ions. In particular, for ions that decrease the dielectric constant
we find a depletion of ions from the vicinity of charged surfaces. For a two-plate system, the same

  

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

 

Collections: Materials Science; Physics