Alois Würger 2006 Europhys. Lett. 74 658 doi:10.1209/epl/i2005-10579-x
Alois Würger
Show affiliationsWe 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.
Issue 4 (May 2006)
Received 23 November 2005, accepted for publication 26 March 2006, in final form 26 March 2006
Published 12 April 2006
Alois Würger 2006 Europhys. Lett. 74 658
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