TY  - JOUR
AU  - Yang, M.
AU  - Ripoll, M.
TI  - Driving forces and polymer hydrodynamics in the Soret effect
JO  - Journal of physics / Condensed matter
VL  - 24
SN  - 0953-8984
CY  - Bristol
PB  - IOP Publ.
M1  - PreJuSER-20544
SP  - 195101
PY  - 2012
N1  - Record converted from VDB: 12.11.2012
AB  - 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.
KW  - Diffusion
KW  - Hydrodynamics
KW  - Models, Theoretical
KW  - Polymers: chemistry
KW  - Reproducibility of Results
KW  - Solutions
KW  - Temperature
KW  - Polymers (NLM Chemicals)
KW  - Solutions (NLM Chemicals)
KW  - J (WoSType)
LB  - PUB:(DE-HGF)16
C6  - pmid:22466869
UR  - <Go to ISI:>//WOS:000303501000003
DO  - DOI:10.1088/0953-8984/24/19/195101
UR  - https://juser.fz-juelich.de/record/20544
ER  -