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| Home > Publications database > Driving forces and polymer hydrodynamics in the Soret effect |
| Home > Publications database > Driving forces and polymer hydrodynamics in the Soret effect |
| Journal Article | PreJuSER-20544 |
;
2012
IOP Publ.
Bristol
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Please use a persistent id in citations: doi:10.1088/0953-8984/24/19/195101
Abstract: A temperature gradient induces different driving forces on the components of a mixture which translates into their segregation. We show that these driving forces constitute the physical picture behind the thermodiffusion effect, and provide an alternative expression of the Soret coefficient which can be applied to both colloidal suspensions and molecular mixtures. To verify the validity of the formalism, we quantify the related forces in an Eulerian reference frame by non-equilibrium molecular simulations. Furthermore, we present an analytical argument to show that the hydrodynamic interactions need to be accounted for to obtain the proper scaling of the thermophoretic force. This result combined with the presented expression satisfactorily explains the experimentally known size dependence of the thermodiffusion coefficient in dilute polymer solutions.
Keyword(s): Diffusion (MeSH) ; Hydrodynamics (MeSH) ; Models, Theoretical (MeSH) ; Polymers: chemistry (MeSH) ; Reproducibility of Results (MeSH) ; Solutions (MeSH) ; Temperature (MeSH) ; Polymers ; Solutions ; J
; Current Contents - Social and Behavioral Sciences ; JCR ; Nationallizenz
; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection
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