[Todos] lunes 18 de marzo - 13 hs - Seminario DQIAQF - INQUIMAE

[Graciela A. González]

Seminarios DQIAQF - INQUIMAE, lunes 18 de marzo - 13 hs.

Aula de Seminarios INQUIMAE - DQIAQF
Facultad de Ciencias Exactas y Naturales
Ciudad Universitaria - Pab. 2  -  Piso 3

David Andelman
School of Physics and Astronomy
Tel Aviv University, 69978 Tel Aviv Israel

Title:
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Ionic Solutions in Biological and Soft-Matter Physics:
a Mini Review and Recent Results

Abstract
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In aqueous solutions, dissolved ions interact strongly with the
surrounding water and surfaces, thereby modifying solution properties in
an ion-specific manner. The Poisson-Boltzmann description of ionic
solutions has been successfully used in predicting charge distributions
and interactions between charged macromolecules. However, when dealing
with various aspects of real physical, chemical and biological systems,
the Poisson-Boltzmann has several noticeable shortcomings. Here, we
incorporate several additional effects to the ionic solution free-energy
and 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. Among others, they include
steric effects due to finite ion size close to interfaces, local
variations of the solution dielectric constant due to the presence of
ions, mixed solvent effects, direct ion-surface interactions and charge
regulation, and solutions of antagonist ions.