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Updated: Jun 23, 2026

Spatial Separation of Molecular Conformers and Clusters
10:37

Spatial Separation of Molecular Conformers and Clusters

Published on: January 9, 2014

Soret effect in molecular mixtures.

Konstantin I Morozov1

  • 1Institute of Continuous Media Mechanics, Ural Branch of RAS, Perm 614013, Russia. mrk@icmm.ru

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|April 28, 2009
PubMed
Summary
This summary is machine-generated.

A new theory explains the Soret effect in nonpolar liquids using partial pressure gradients. This approach accurately predicts thermal diffusion in systems like benzene-cyclohexane.

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Area of Science:

  • Physical Chemistry
  • Thermodynamics
  • Chemical Physics

Background:

  • The Soret effect, or thermal diffusion, describes mass transfer in response to a temperature gradient.
  • Understanding this phenomenon in binary nonpolar liquids is crucial for various chemical engineering processes.
  • Existing models often lack explicit definitions for interaction parameters.

Purpose of the Study:

  • To develop a theoretical framework for describing the Soret effect in binary nonpolar liquids.
  • To identify the driving force of thermal diffusion and derive an explicit relation for the Soret coefficient.
  • To validate the proposed theory using experimental data for the benzene-cyclohexane system.

Main Methods:

  • A theoretical approach based on a hard-sphere fluid reference system.
  • Determination of the temperature gradient of partial pressure as the driving force.
  • Utilizing solvation theory to define interparticle interaction parameters, including the van der Waals constant.

Main Results:

  • An explicit relation for the Soret coefficient (S_T) was derived, comprising contributions from steric repulsions and attractive interactions.
  • The van der Waals constant for cross-interactions was expressed via the excess volume of the mixture.
  • The theory demonstrated reasonable agreement with experimental data for the Soret coefficient and its temperature dependence in benzene-cyclohexane.

Conclusions:

  • The proposed theoretical approach provides a robust method for describing the Soret effect in binary nonpolar liquids.
  • The chemical contribution to S_T is well-represented by steric and attractive interaction components.
  • The theory offers a valuable tool for predicting and understanding thermal diffusion phenomena in liquid mixtures.