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Temperature-induced migration of electro-neutral interacting colloidal particles.

J K G Dhont1, W J Briels2

  • 1Forschungszentrum Juelich, Biomacromolecular Systems and Processes (IBI-4), Wilhelm-Johnen-Strasse, 52428 Juelich, Germany; Heinrich Heine Universitaet, Department of Physics, Universitaetsstrasse 1, 40225 Düsseldorf, Germany. Electronic address: https://www.fz-juelich.de/en/ibi/ibi-4.

Journal of Colloid and Interface Science
|April 12, 2024
PubMed
Summary
This summary is machine-generated.

This study introduces a new thermophoretic interaction force for colloids, crucial for understanding the Soret effect. This collective force is essential for accurately describing thermodiffusion coefficients in colloidal systems.

Keywords:
Fokker-Planck equationInteracting colloidsSmoluchowski equationSoret effectTemperature gradientsThermal diffusionThermodiffusionUncharged colloids

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Area of Science:

  • Colloid Science
  • Thermodynamics
  • Soft Matter Physics

Background:

  • Temperature gradients induce particle migration, known as thermodiffusion or the Soret effect.
  • The thermophoretic force driving this migration has contributions from single-particle properties and inter-colloid interactions.

Purpose of the Study:

  • To develop an irreversible thermodynamics-based theory for the collective contribution to thermophoretic force.
  • To introduce a novel thermophoretic interaction force for uncharged colloids.
  • To propose an N-particle Smoluchowski equation compatible with this thermodynamic approach.

Main Methods:

  • Developed a theory based on irreversible thermodynamics to model collective thermophoretic forces.
  • Formulated an N-particle Smoluchowski equation incorporating temperature gradients.
  • Compared theoretical predictions with experimental data for colloids with temperature-dependent interactions.

Main Results:

  • Introduced a novel 'thermophoretic interaction force' arising from colloid interactions.
  • The proposed N-particle Smoluchowski equation aligns with the irreversible thermodynamics framework.
  • Experimental data on Soret and thermodiffusion coefficients were accurately described only when including the novel interaction force.

Conclusions:

  • The collective contribution to thermophoretic force, specifically the thermophoretic interaction force, is critical for understanding thermodiffusion in colloidal systems.
  • Accurate modeling of the Soret effect requires accounting for inter-colloid interactions beyond single-particle effects.
  • The developed theory and Smoluchowski equation provide a robust framework for studying thermodiffusion phenomena.