| In this article we derive the phoretic forces acting on a tracer particle, which is assumed to be small compared to the mean free path of the surrounding nonequilibrium gas, i.e., usually a nanoparticle << 100 nm. First, we review and extend the calculations of Waldmann [L. Waldmann, Z. Naturforsch. 14a, 589 (1959)] using half sphere integrations and an accommodation coefficient characterizing the collision process. The presented methodology is applied to a gas subject to temperature, pressure and velocity gradients. Corresponding thermophoretic, barophoretic and rheophoretic forces are derived, and explicit expressions for spherical particles are compared to known results. Second, nonequilibrium thermodynamics is used to join the diffusion equation for the tracer particle with the continuum equations of nonisothermal hydrodynamics of the solvent. So doing, the distinct origin of the thermophoretic and barophoretic force is demonstrated. While the latter enters similarly to an interaction potential, the former is given by flux-flux correlations in terms of a Green-Kubo relation, as shown in detail.
for LaTeX users @article{MH\"utter2006-124,
author = {M. H\"utter and M. Kr\"oger},
title = {Phoretic forces on convex particles from kinetic theory and nonequilibrium thermodynamics},
journal = {J. Chem. Phys.},
volume = {124},
pages = {044511},
year = {2006}
}
\bibitem{MH\"utter2006-124} M. H\"utter, M. Kr\"oger,
Phoretic forces on convex particles from kinetic theory and nonequilibrium thermodynamics,
J. Chem. Phys. {\bf 124} (2006) 044511 (13 pages).MH\"utter2006-124
M. H\"utter, M. Kr\"oger
Phoretic forces on convex particles from kinetic theory and nonequilibrium thermodynamics
J. Chem. Phys.,124,2006,044511 (13 pages) |
mk@mat.ethz.ch
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