Regensburg 2019 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 17: Poster Session I

CPP 17.17: Poster

Montag, 1. April 2019, 17:30–19:30, Poster B1

Thermophoresis of a single colloidal particle — •Daniel Benjamin Mayer and Thomas Franosch — Institut für Theoretische Physik, Lepold-Franzens Universität, Technikerstraße 21A, A-6020 Innsbruck, Austria

We want to address the problem of a single charged colloid immersed in an electrolyte solution. In the presence of a temperature gradient, electrical body forces are no longer counter balanced by pressure gradients, thereby inducing solvent flow and a directed motion of the colloidal particle. In the limit of small temperature gradients, we numerically solve the associated field equations, including the non-linear Poisson-Boltzmann equation for the electrical potential and the steady Stokes equation governing the fluid flow.

The aim to calculate the thermal mobility is accompanied by difficulties since it appears as a boundary condition in the governing electro-kinetic equations. However a decomposition of the problem into two auxiliary ones simplifies this task considerably. Furthermore we also examine the dependence of the thermal mobility on the surface potential and the Soret coefficient of the different ions in the electrolyte.