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Area of Science:

  • Colloid and Interface Science
  • Rheology of Complex Fluids
  • Computational Materials Science

Background:

  • Colloidal suspensions in binary liquid mixtures exhibit complex rheological behavior.
  • Understanding particle interactions and aggregation is crucial for predicting suspension properties.

Purpose of the Study:

  • To numerically investigate the behavior of colloidal suspensions in binary liquid mixtures under shear flow.
  • To analyze the influence of proximity to the phase-separation point on suspension viscosity and structure.

Main Methods:

  • Numerical simulations of colloidal particle dynamics in binary liquid mixtures.
  • Analysis of viscosity changes and structural rearrangements under applied shear flow.

Main Results:

  • Suspensions exhibit Newtonian viscosity far from phase separation, but increased viscosity near it due to particle aggregation.
  • Aggregation is driven by attractive interactions and concentration heterogeneity caused by surface wetting.
  • Shear thinning behavior is observed as aggregated structures rearrange into smaller clusters under shear.
  • Particle concentration profiles are minimally disturbed by shear flow at the onset of structural changes.

Conclusions:

  • The rheological properties of colloidal suspensions are strongly dependent on their proximity to the phase-separation point of the binary liquid mixture.
  • Shear flow induces significant structural rearrangements, leading to shear-thinning, while effective particle interactions remain largely isotropic.