Ion-specific hydration effects: Extending the Poisson-Boltzmann theory |
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| Authors: | Dan Ben-Yaakov David Andelman Rudi Podgornik Daniel Harries |
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| Affiliation: | aRaymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv University, Ramat Aviv, Tel Aviv 69978, Israel;bDepartment 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;cInstitute of Chemistry and The Fritz Haber Research Center, The Hebrew University, Jerusalem 91904, Israel |
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| Abstract: | In aqueous solutions, dissolved ions interact strongly with the surrounding water and surfaces, thereby modifying solution properties in an ion-specific manner. These ion-hydration interactions can be accounted for theoretically on a mean-field level by including phenomenological terms in the free energy that correspond to the most dominant ion-specific interactions. Minimizing this free energy leads to modified Poisson-Boltzmann equations with appropriate boundary conditions. Here, we review how this strategy has been used to predict some of the ways ion-specific effects can modify the forces acting within and between charged interfaces immersed in salt solutions. |
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| Keywords: | Electrostatic interactions Ion specific interactions Poisson-Boltzmann theory Forces between charged surfaces Hydration forces |
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