Abstract.
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.
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Burelbach, J., Frenkel, D., Pagonabarraga, I. et al. A unified description of colloidal thermophoresis. Eur. Phys. J. E 41, 7 (2018). https://doi.org/10.1140/epje/i2018-11610-3
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DOI: https://doi.org/10.1140/epje/i2018-11610-3