Dresden 2014 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 36: Colloids and Complex Liquids II

CPP 36.13: Talk

Wednesday, April 2, 2014, 18:15–18:30, ZEU 114

Electrostatic interaction between colloids trapped at an electrolyte interface — •Arghya Majee, Markus Bier, and Siegfried Dietrich — Max Planck Institute IS and University of Stuttgart, Germany

Self-assembly of stably trapped colloidal particles at electrolyte interfaces has attracted much interest in recent years. For large separations between the charged particles, the repulsive part of the interaction can be compared to a dipole-dipole interaction. However for distances close to the particle this simple dipolar picture cannot be applied. In this contribution we will consider the case of colloids situated very close (~50-100 nm) to each other at an electrolyte interface by going beyond the superposition approximation [1]. Within an appropriate model exact analytic expressions for the electrostatic potential as well as for the surface and line interaction energies are obtained. They demonstrate that the widely used superposition approximation, which is commonly applied to large distances between the colloidal particles, fails qualitatively at small distances and is quantitatively unreliable even at large distances. Our results contribute to an improved description of the interaction between colloidal particles trapped at fluid interfaces.

[1] "Electrostatic interaction between colloidal particles trapped at an electrolyte interface" by A. Majee, M. Bier, and S. Dietrich (submitted).