Berlin 2008 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 35: Interfaces

CPP 35.7: Vortrag

Freitag, 29. Februar 2008, 12:15–12:30, C 130

Specific Ion Adsorption at Solid Surfaces — •Dominik Horinek, Douwe Bonthuis, and Roland R. Netz — Physik Department, Technische Universität München, 85748 Garching, Germany

Ion specific effects at solid surfaces are of fundamental importance in biology, physics, and chemistry. Contrary to electrostatic forces, which are well-described by analytical theories, there is no satisfying theory for all solvent-induced forces. We present molecular dynamics simulations for the calculation of potentials of mean force for ion adsorption at hydrophobic and hydrophilic surfaces. We discuss ion specific effects at infinite dilution as well as their implications for the surface tension and surface potential at finite salt concentrations based on an extended Poisson-Boltzmann modeling where we include the potentials of mean force from simulation. We obtain qualitative agreement with experiments.