We present a microscopic description of thermophoretic phenomena in dilute suspensions of spherical colloids. The specific particle/solvent interfacial interactions generate a force density field F on the surrounding fluid which in turn gives rise to an “effective force" on the colloid. In our approach, such a force turns out to be solely related to the non-conservative anisotropic contribution to F brought forth by the thermal gradient. By adopting a Smoluchowski picture of colloid motion, we find a general expression for the Soret coefficient ST , which we apply to the specific cases of neutral colloids in pure solvent and of Debye-Hückel systems. For the latter, our result for ST agrees with those obtained by previous hydrodynamic approaches.
Particle thermophoresis in liquids
PIAZZA, ROBERTO
2004-01-01
Abstract
We present a microscopic description of thermophoretic phenomena in dilute suspensions of spherical colloids. The specific particle/solvent interfacial interactions generate a force density field F on the surrounding fluid which in turn gives rise to an “effective force" on the colloid. In our approach, such a force turns out to be solely related to the non-conservative anisotropic contribution to F brought forth by the thermal gradient. By adopting a Smoluchowski picture of colloid motion, we find a general expression for the Soret coefficient ST , which we apply to the specific cases of neutral colloids in pure solvent and of Debye-Hückel systems. For the latter, our result for ST agrees with those obtained by previous hydrodynamic approaches.File | Dimensione | Formato | |
---|---|---|---|
2004_EPJE_PAROLA.pdf
Accesso riservato
:
Post-Print (DRAFT o Author’s Accepted Manuscript-AAM)
Dimensione
198.81 kB
Formato
Adobe PDF
|
198.81 kB | Adobe PDF | Visualizza/Apri |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.