Place: Levin building, Lecture Hall No. 8
David Andelman, School of Physics, Tel Aviv University
Abstract: The Poisson-Boltzmann theory is a mean-field description of ionic solutions and electrified interfaces, and has been instrumental during the last century to predict charge distributions and interactions between charged surfaces, membranes, electrodes as well as macromolecules and colloids. While the electrostatic model of charged fluids, on which the Poisson-Boltzmann description rests, and its statistical mechanical consequences have been scrutinized in great detail, much less is understood about its probable shortcomings when dealing with various aspects of real physical, chemical, and biological systems. After a short review of the Poisson-Boltzmann theory, I will discuss several modern extensions and modifications as applied to ions and macromolecules in confined geometries. They include among others the effect of dipolar solvent molecules, finite size of ions, ionic specificity, surface tension and conductivity of concentrated ionic solutions.