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Emergent topological phenomena in active polymeric fluids.

Raj Kumar Manna1, P B Sunil Kumar2

  • 1Department of Physics, Indian Institute of Technology Madras, Chennai, India. raj@physics.iitm.ac.in.

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Summary
This summary is machine-generated.

Active polymeric fluids exhibit complex behaviors like entanglement and flow. This study uses augmented Langevin equations to explore how chain activity and interactions drive topological changes, leading to novel structures.

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Area of Science:

  • Soft Matter Physics
  • Polymer Science
  • Non-equilibrium Statistical Mechanics

Background:

  • Polymeric fluids display rich topological phenomena explained by statistical mechanics.
  • Activity introduces spontaneous motion and flow, requiring augmented theories.
  • Understanding active polymer behavior is crucial for novel material design.

Purpose of the Study:

  • To investigate the topological phenomena in active polymeric solutions and melts.
  • To analyze the effects of chain contractility and extensibility on fluid behavior.
  • To explore defect production and phase transitions in active polymer systems.

Main Methods:

  • Utilizing augmented Langevin equations for simulating active polymeric fluids.
  • Modeling polymers as hydrodynamically interacting stresslets.
  • Simulating systems in spherical volumes and on spherical surfaces.

Main Results:

  • Contractile chains form entangled melts in spherical volumes; extensile chains show density-dependent reptating or non-reptating states.
  • On spherical surfaces, contractile chains transition between isotropic, ordered, and phase-separated states; extensile chains transition to nematic states.
  • Defects in ordered states are produced athermally without topological charge conservation, reproducing experimental observations.

Conclusions:

  • Hydrodynamic interactions are critical in active polymer fluids.
  • Activity drives non-equilibrium kinetic routes to topological structures difficult to achieve in equilibrium.
  • This research provides insights into active matter physics and polymer dynamics.