Dresden 2020 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 97: Wetting and Liquids at Interfaces and Surfaces I (joint session CPP/DY/O)

O 97.4: Vortrag

Donnerstag, 19. März 2020, 10:15–10:30, ZEU 255

Hard sphere electrolyte solutions at heterogeneously charged substrates — •Maximilian Mußotter1, Markus Bier2, and S. Dietrich11Max-Planck Institut für Intelligente Systeme und Universität Stuttgart, 70569 Stuttgart, Germany — 2University of Applied Sciences Würzburg-Schweinfurt, 97421 Schweinfurt, Germany

The structure of a dilute electrolyte solution close to a surface carrying a non-homogeneous surface charge distribution is investigated by means of classical density functional theory (DFT) within the approach of fundamental measure theory (FMT). In the case of electrolyte solutions, the effects of these inhomogeneities are particularly severe due to the corresponding length scale being the Debye length, which is large compared to molecular sizes. A fully three-dimensional investigation is performed, which accounts explicitly for the sol- vent particles, and thus provides insight in effects of ion-solvent coupling. The present work introduces a powerful framework to study a broad range of possible surface charge heterogeneities even beyond the linear response regime, showing a sensitive dependence of the density profiles of the fluid components and of the electrostatic potential on the magnitude of the charge as well as on the short ranged details of the surface charge pattern.

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