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Dynamics of multiphase systems with complex microstructure. II. Particle-stabilized interfaces.

Leonard M C Sagis1

  • 1Food Physics Group, Wageningen University, Bomenweg 2, 6703 HD Wageningen, The Netherlands and ETH Zurich, Department of Materials, Polymer Physics, Wolfgang-Pauli-Strasse 10, 8093 Zurich, Switzerland.

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

This study models surface stress in colloidal particle interfaces using nonequilibrium thermodynamics. The model accurately predicts shear thinning and harmonic generation in complex interfacial microstructures.

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Area of Science:

  • Soft matter physics
  • Interface science
  • Non-equilibrium thermodynamics

Background:

  • Interfaces stabilized by colloidal particles exhibit complex microstructures.
  • Anisotropic colloidal particles at interfaces lead to anisotropic surface stress.
  • Understanding surface rheology is crucial for interfacial phenomena.

Purpose of the Study:

  • To derive constitutive equations for the surface stress tensor in particle-stabilized interfaces.
  • To incorporate microstructural dependence into surface stress modeling.
  • To validate the model against experimental observations of interfacial rheology.

Main Methods:

  • Utilized the GENERIC (general equation for nonequilibrium reversible-irreversible coupling) framework.
  • Developed a tensorial structural variable to represent particle orientation.
  • Combined constitutive equations with a time-evolution equation for the orientation tensor.

Main Results:

  • The model predicts shear thinning behavior in surface shear flow.
  • It accurately reproduces the emergence of even harmonics in oscillatory dilatational flow.
  • Demonstrated good agreement between model predictions and experimental data for nonlinear stress-deformation.

Conclusions:

  • Simple structural models can effectively capture complex nonlinear interfacial behavior.
  • The GENERIC framework provides a robust approach for modeling surface rheology.
  • This work offers a valuable tool for understanding and predicting the behavior of complex interfaces.