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Phase Diagram Characterization Using Magnetic Beads as Liquid Carriers
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Nonequilibrium critical Casimir effect in binary fluids.

Akira Furukawa1, Andrea Gambassi, Siegfried Dietrich

  • 1Institute of Industrial Science, University of Tokyo, Meguro-ku, Tokyo 153-8505, Japan.

Physical Review Letters
|August 20, 2013
PubMed
Summary
This summary is machine-generated.

Critical Casimir forces (CCFs) on colloids in critical binary mixtures are explored beyond equilibrium. Moving particles significantly alter CCFs, impacting drag forces and colloid interactions in near-critical fluids.

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Area of Science:

  • Soft Matter Physics
  • Fluid Dynamics
  • Colloid Science

Background:

  • Colloids in critical binary liquid mixtures experience critical Casimir forces (CCFs).
  • CCFs arise from confined concentration fluctuations and effective surface fields.
  • Previous CCF studies focused mainly on systems in thermodynamic equilibrium.

Purpose of the Study:

  • To investigate the largely unexplored changes in CCFs under nonequilibrium conditions.
  • To study the drag force on a single moving colloid in a near-critical fluid.
  • To analyze the relative motion of two colloids driven by CCFs.

Main Methods:

  • Utilized a fluid particle dynamics method.
  • Accounted for kinetic couplings between the order parameter field, solvent velocity, and particle motion.
  • Simulated single and two-colloid systems in near-critical binary mixtures.

Main Results:

  • Demonstrated significant changes in CCFs due to colloid motion and solvent flow.
  • Quantified the drag force on a single moving colloid.
  • Observed emergent effects in CCFs near the critical point under nonequilibrium conditions.

Conclusions:

  • Extended the understanding of CCFs from equilibrium to nonequilibrium processes.
  • Highlighted the relevance of these nonequilibrium effects for current experiments.
  • Showcased the significant impact of dynamic perturbations on CCFs near critical points.