A Unified Description of Colloidal Thermophoresis
Abstract
We use the dynamic length and time scale separation in suspensions to formulate a general description of colloidal thermophoresis. Our approach allows an unambiguous definition of separate contributions to the colloidal flux and clarifies the physical mechanisms behind non-equilibrium motion of colloids. In particular, we derive an expression for the interfacial force density that drives single-particle thermophoresis in non-ideal fluids. The issuing relations for the transport coefficients explicitly show that interfacial thermophoresis has a hydrodynamic character that cannot be explained by a purely thermodynamic consideration. Our treatment generalises the results from other existing approaches, giving them a clear interpretation within the framework of non-equilibrium thermodynamics.
Keywords
Cite
@article{arxiv.1708.02195,
title = {A Unified Description of Colloidal Thermophoresis},
author = {Jerome Burelbach and Daan Frenkel and Ignacio Pagonabarraga and Erika Eiser},
journal= {arXiv preprint arXiv:1708.02195},
year = {2017}
}