Soret motion in non-ionic binary molecular mixtures.

@article{Leroyer2011SoretMI,
  title={Soret motion in non-ionic binary molecular mixtures.},
  author={Yves Leroyer and Alois W{\"u}rger},
  journal={The Journal of chemical physics},
  year={2011},
  volume={135 5},
  pages={
          054102
        }
}
We study the Soret coefficient of binary molecular mixtures with dispersion forces. Relying on standard transport theory for liquids, we derive explicit expressions for the thermophoretic mobility and the Soret coefficient. Their sign depends on composition, the size ratio of the two species, and the ratio of Hamaker constants. Our results account for several features observed in experiment, such as a linear variation with the composition; they confirm the general rule that small molecules… 
View on PubMed
hal.archives-ouvertes.fr
9 Citations
Background Citations
1
Methods Citations
1

Figures and Tables from this paper

9 Citations

Citation Type

Citation Type

Theory of Soret coefficients in binary organic solvents.
TLDR
Calculations of enthalpies of evaporation from the model yield good agreement with experimental values, however, calculations of the associated energetic parameters were several times larger than those reported in the literature from numeric simulations of material transport.
Comment on "Soret motion in non-ionic binary molecular mixtures" [J. Chem. Phys. 135, 054102 (2011)].
TLDR
The material transport equations derived by Leroyer and Würger do not adequately provide a description of material transport in liquid binary systems and an alternate approach based on non-equilibrium thermodynamics is presented.
Mass effect on the Soret coefficient in n-alkane mixtures.
TLDR
It is shown that equimolar mixtures behave as isotopic-like mixtures in which only the mass effect contributes to the Soret effect, and a small linear dependence with the molar fraction is observed.
Is Soret equilibrium a non-equilibrium effect?
The Soret Effect in Liquid Mixtures – A Review
Abstract The Soret effect describes diffusive motion that originates from a temperature gradient. It is observed in mixtures of gases, liquids and even solids. Although there is a formal…
Thermophoresis of polymers: nondraining vs draining coil.
TLDR
It is shown that the characteristic thermophoretic interaction decays as r(-2) with the distance from the chain segment, which is of much longer range than the underlying rapidly decaying binary van der Waals interaction.
Constitutive Relations of Thermal and Mass Diffusion
Abstract Non-equilibrium thermodynamics provides a general framework for the description of mass and thermal diffusion, thereby including also cross-thermal and material diffusion effects, which are…
Can the Thermophoretic Mobility of Uncharged Colloids Be Predicted?
The thermophoretic motion of nonionic colloids in an inhomogeneous temperature field is due to the solvent-colloid dispersion interactions. The latter form an attractive near-particle "gravity" field…
Colloidal Energetic Systems

References

SHOWING 1-10 OF 99 REFERENCES
Soret effect in molecular mixtures.
  • K. Morozov
  • Physics, Chemistry
    Physical review. E, Statistical, nonlinear, and soft matter physics
  • 2009
TLDR
A reasonable agreement of theoretical and experimental results is revealed for the Soret coefficient and its temperature dependence for the benzene-cyclohexane system.
Temperature dependence of the soret motion in colloids.
  • A. Würger
  • Physics
    Langmuir : the ACS journal of surfaces and colloids
  • 2009
TLDR
The results provide an explanation for experiments on various colloidal suspensions and, in particular, for the observed change of sign of D(T) as a function of temperature.
Molecular-weight dependent thermal diffusion in dilute polymer solutions.
TLDR
These findings explain the dependence on Mw observed recently for polystyrene, and its inverse Soret effect at very small Mw, and bridge the gap between the macroscopic hydrodynamics description for large solutes and the enthalpy-of-transport picture for small molecules.
Thermal diffusion in a binary liquid due to rectified molecular fluctuations.
TLDR
From a hard-bead model with elastic collisions in a nonuniform temperature, a net force on each molecule is derived, which is proportional to the temperature gradient and depends on the ratio of the molecular masses and moments of inertia.
Thermal diffusion in liquid mixtures and polymer solutions
Thermodiffusion, also called thermal diffusion or the Ludwig–Soret effect, describes the coupling between a temperature gradient and a resulting mass flux in a multicomponent system. Although Ludwig…
Molecular origin of thermal diffusion in benzene + cyclohexane mixtures.
TLDR
The isotope effect in thermal diffusion of benzene+cyclohexane mixtures has been investigated by a holographic grating technique, in agreement with molecular dynamics calculations: the heavier component migrates to the cold side.
Thermal diffusion of dilute polymer solutions: the role of solvent viscosity.
TLDR
Measurements of the thermal diffusion coefficient D(T) in the dilute limit on polystyrene in cyclo-octane, cyclohexane, benzene, toluene, tetrahydrofuran, ethyl acetate, and methyl ethyl ketone and of poly(dimethyl-siloxane) in toLUene are performed to test various theoretical predictions.
Thermal diffusion sensitivity to the molecular parameters of a binary equimolar mixture, a non-equilibrium molecular dynamics approach
METHODOLOGICAL NOTES: Mass transport thermodynamics in nonisothermal molecular liquid mixtures
Mass transport in a nonisothermal binary molecular mixture is systematically discussed in terms of nonequilibrium thermodynamics, which for the first time allows a consistent and unambiguous…
From Small Molecules to High Polymers: Investigation of the Crossover of Thermal Diffusion in Dilute Polystyrene Solutions
We have studied the crossover from small-molecule to polymer behavior in the Soret effect of dilute solutions of polystyrene in seven different solvents. The molar masses range from the monomer to M…
...
1
2
3
4
5
...