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Supercoiled ring polymers under shear flow.

Christoph Schneck1,2, Jan Smrek1, Christos N Likos1

  • 1Faculty of Physics, University of Vienna, Boltzmanngasse 5, 1090 Vienna, Austria. christoph.schneck@ehu.eus.

Nanoscale
|April 19, 2024
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Summary
This summary is machine-generated.

Supercoiled ring polymers exhibit unique flow properties under shear, showing less deformation and tumbling than flexible polymers due to inherent rigidity and hydrodynamics. Hydrodynamic interactions can induce topological changes in these polymers at high shear rates.

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Area of Science:

  • Polymer physics
  • Computational materials science
  • Rheology

Background:

  • Flexible polymers deform significantly under shear.
  • Supercoiled polymers possess inherent bending and torsional rigidities.
  • Hydrodynamic interactions play a crucial role in polymer dynamics.

Purpose of the Study:

  • Investigate the flow properties of supercoiled ring polymers under shear.
  • Compare the behavior of supercoiled rings with flexible polymers.
  • Analyze the impact of hydrodynamic interactions on polymer conformation and topology.

Main Methods:

  • Monomer-resolved computer simulations of supercoiled ring polymers.
  • Simulations conducted with and without hydrodynamic interactions.
  • Analysis of polymer shape, tumbling, orientation, and topological transformations.

Main Results:

  • Supercoiled rings show minimal shape changes and reduced tumbling under shear compared to flexible polymers.
  • Supercoiled polymers exhibit stronger orientational resistance.
  • Hydrodynamic interactions induce topological transformations (writhe to twist) at high shear rates.

Conclusions:

  • The combination of rigidity and hydrodynamics dictates unique flow behavior in supercoiled polymers.
  • Supercoiled rings offer enhanced stability and resistance to deformation under flow.
  • Hydrodynamic coupling can lead to shear-induced topological changes in polymers.