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A unified description of colloidal thermophoresis

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Burelbach, Jerome 
Pagonabarrag, Ignacio 


We use the dynamic length and time scale separation in suspensions to formulate a general description of colloidal thermophoresis. Our approach allows an unambiguous definition of separate contributions to the colloidal flux and clarifies the physical mechanisms behind non-equilibrium motion of colloids. In particular, we derive an expression for the interfacial force density that drives single-particle thermophoresis in non-ideal fluids. The issuing relations for the transport coefficients explicitly show that interfacial thermophoresis has a hydrodynamic character that cannot be explained by a purely thermodynamic consideration. Our treatment generalises the results from other existing approaches, giving them a clear interpretation within the framework of non-equilibrium thermodynamics.



Topical issue: Non-equilibrium processes in multicomponent and multiphase media

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The European Physical Journal E

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Springer Nature
European Commission Horizon 2020 (H2020) Marie Sk?odowska-Curie actions (674979)
This work was supported by the Winton Programme for the Physics of Sustainability. DF further acknowledges support by the European Union through the European Training Network NANOTRANS Grant 674979, and IP acknowledges MINECO and DURSI for financial support under projects FIS2015- 67837-P and 2014SGR-922, respectively.