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Field-induced alignment of flexible polyelectrolytes in solution.

Tak Shing Lo1, Boris Khusid, Joel Koplik

  • 1The Levich Institute and Department of Physics, City College of the City University of New York, New York, New York 10031, USA.

Physical Review Letters
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Summary

Molecular dynamics simulations reveal how charged polymers align in electric fields. Local charge fluctuations, not just the polymer chain, are key to this alignment, offering new experimental probes.

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Area of Science:

  • Polymer Physics
  • Computational Biophysics
  • Soft Matter Science

Background:

  • Understanding the behavior of charged macromolecules (polyelectrolytes) in external fields is crucial for various applications.
  • Existing theories often simplify the complex interactions between polyelectrolytes and their surrounding ions.

Purpose of the Study:

  • To investigate the dynamical coupling between macromolecule conformational changes and the ionic cloud.
  • To clarify the mechanisms governing the field-induced alignment of flexible polyelectrolytes.
  • To compare simulation results with experimental findings and challenge existing theoretical models.

Main Methods:

  • Utilizing molecular dynamics simulations to model a highly charged flexible macromolecule.
  • Analyzing the interplay between conformational fluctuations and the surrounding ionic atmosphere.
  • Examining local charge and field fluctuations near the macromolecule.

Main Results:

  • A simple model of a polyelectrolyte as a chain of charged monomers effectively reproduces experimental observations of field-induced alignment.
  • Contrary to prevailing theories, correlated local charge and field fluctuations significantly influence alignment along an external field.
  • Short-lived clustering between monomers and counterions plays a dominant role.

Conclusions:

  • The simplified polyelectrolyte model is sufficient for capturing essential aspects of field-induced alignment.
  • Local charge dynamics are critical for understanding polyelectrolyte behavior in electric fields.
  • Measuring field-induced scattering anisotropy could provide experimental evidence for monomer-counterion clustering.