| Issue |
Europhys. Lett.
Volume 74, Number 4, May 2006
|
|
|---|---|---|
| Page(s) | 658 - 664 | |
| Section | Condensed matter: structural, mechanical and thermal properties | |
| DOI | https://doi.org/10.1209/epl/i2005-10579-x | |
| Published online | 12 April 2006 | |
Heat capacity-driven inverse Soret effect of colloidal nanoparticles
CPMOH, CNRS-Université Bordeaux 1 351 cours de la Libération, 33405 Talence, France
Received:
23
November
2005
Accepted:
26
March
2006
We discuss the thermophoresis of colloidal suspensions and derive their Soret
coefficient in terms of known thermodynamic functions. For solid
nanoparticles, ST is determined by the ratio of the heat capacities of
the solute and the solvent, and is in general much larger than the ideal gas
value 
. For aqueous suspensions of most solid materials, we obtain
a strong inverse Soret effect (
), whereas a positive sign occurs for
common organic solvents such as toluene and cyclohexane. These findings
provide an explanation for recent experiments on ferrofluids.
PACS: 66.10.Cb – Diffusion and thermal diffusion / 82.70.Dd – Colloids
© EDP Sciences, 2006
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