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Heat capacity-driven inverse Soret effect of colloidal nanoparticles

Alois Würger

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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 ST = 1/T. For aqueous suspensions of most solid materials, we obtain a strong inverse Soret effect (ST < 0), 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.C- Diffusion and thermal diffusion

82.70.Dd Colloids

Subjects

Soft matter, liquids and polymers

Chemical physics and physical chemistry

Dates

Issue 4 (May 2006)

Received 23 November 2005, accepted for publication 26 March 2006, in final form 26 March 2006

Published 12 April 2006



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