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

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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.
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