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Driven spheres, ellipsoids and rods in explicitly modeled polymer solutions.

Andreas Zöttl1,2,3, Julia M Yeomans1

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Driven nanoparticles and microparticles move faster than predicted in complex polymer fluids. Simulations reveal polymer depletion near particles causes slip, explaining their enhanced transport velocities.

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Area of Science:

  • Complex Fluids
  • Nanoparticle and Microparticle Dynamics
  • Polymer Physics

Background:

  • Understanding particle transport in complex fluids is crucial for biological and technological applications.
  • Existing models like Stokes law may not fully capture particle behavior in polymer solutions.

Purpose of the Study:

  • To investigate the transport mechanisms of driven spherical and elongated particles in polymeric fluids.
  • To analyze the influence of polymer concentration on particle velocity and fluid dynamics.

Main Methods:

  • Hydrodynamic multiparticle collision dynamics (HPCDC) simulations were employed.
  • Simulations included spherical and elongated particles in polymer solutions at varying concentrations.
  • Fluid flow fields, local polymer density, and polymer conformation were analyzed.

Main Results:

  • Observed mean particle velocities exceeded predictions from Stokes law for all particle shapes and polymer densities.
  • Identified polymer-depleted regions adjacent to the particles.
  • Demonstrated that this depletion induces an apparent tangential slip velocity, explaining the enhanced transport.

Conclusions:

  • Polymer depletion near driven particles is the primary cause of their accelerated transport in complex fluids.
  • A simple two-layer fluid model accurately predicts the observed simulation results.
  • Findings provide insights into particle dynamics in polymer solutions for various applications.