This title appears in the Scientific Report :
2012
Please use the identifier:
http://dx.doi.org/10.1088/0953-8984/24/19/195101 in citations.
Driving forces and polymer hydrodynamics in the Soret effect
Driving forces and polymer hydrodynamics in the Soret effect
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 ca...
Saved in:
Personal Name(s): | Yang, M. |
---|---|
Ripoll, M. | |
Contributing Institute: |
Theorie der Weichen Materie und Biophysik; ICS-2 |
Published in: | Journal of physics / Condensed matter, 24 (2012) S. 195101 |
Imprint: |
Bristol
IOP Publ.
2012
|
Physical Description: |
195101 |
PubMed ID: |
22466869 |
DOI: |
10.1088/0953-8984/24/19/195101 |
Document Type: |
Journal Article |
Research Program: |
BioSoft: Makromolekulare Systeme und biologische Informationsverarbeitung |
Series Title: |
Journal of Physics: Condensed Matter
24 |
Subject (ZB): | |
Publikationsportal JuSER |
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. |