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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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Semiflexible polymer conformation, distribution and migration in microcapillary flows.

Raghunath Chelakkot1, Roland G Winkler, Gerhard Gompper

  • 1Institut für Festkörperforschung, Forschungszentrum Jülich, 52425 Jülich, Germany.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|April 22, 2011
PubMed
Summary

Semiflexible polymers in microchannels exhibit complex flow behavior due to competing forces. Their distributions shift from the center to the wall as flow velocity increases.

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Area of Science:

  • Polymer physics
  • Fluid dynamics
  • Computational biophysics

Background:

  • Understanding polymer behavior in confined spaces is crucial for microfluidic applications.
  • Semiflexible polymers present unique conformational dynamics influenced by rigidity and flow.

Purpose of the Study:

  • To investigate the flow behavior of semiflexible polymers within microchannels.
  • To analyze the impact of bending rigidity and flow velocity on polymer conformations and distributions.

Main Methods:

  • Utilized multiparticle collision dynamics (MPCD), a particle-based hydrodynamic simulation technique.
  • Examined polymer conformations, monomer/center-of-mass distributions, and radial migration across various persistence lengths (0.5 ≤ L(p)/L(r) ≤ 30).

Main Results:

  • Identified a competition between hydrodynamic lift/steric repulsion (wall avoidance) and flow-induced orientation (center-to-wall drive).
  • Observed complex dynamics arising from the interplay of polymer rigidity, flow velocity, and channel confinement.
  • Noted a generic shift in monomer and center-of-mass distribution maxima from the channel center to an off-center position at higher flow velocities.

Conclusions:

  • The flow behavior of semiflexible polymers in microchannels is a complex interplay of forces dependent on rigidity and velocity.
  • A universal trend of distribution shift is observed, indicating a fundamental response to flow in confined geometries.