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Related Experiment Videos

Like-charge attraction between polyelectrolytes induced by counterion charge density waves.

Thomas E Angelini1, Hongjun Liang, Willy Wriggers

  • 1Department of Materials Science and Engineering, Physics, and Bioengineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.

Proceedings of the National Academy of Sciences of the United States of America
|July 11, 2003
PubMed
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Like-charged objects like polyelectrolytes can attract due to a novel counterion mechanism. This discovery challenges traditional electrostatics, revealing a "zipper-like" charge alignment that impacts colloidal and biological systems.

Area of Science:

  • Colloid and Surface Science
  • Biophysics
  • Materials Science

Background:

  • Electrostatics in water typically assumes repulsion between like charges based on mean-field theories like Poisson-Boltzmann.
  • Observed like-charge attractions in various systems lack a consensus mechanism, despite counterions being implicated.

Purpose of the Study:

  • To directly observe multivalent ion organization on filamentous actin.
  • To elucidate the mechanism behind like-charge attractions in biological polyelectrolytes.

Main Methods:

  • Synchrotron X-ray diffraction was used to study multivalent ion organization on filamentous actin.
  • Analysis focused on the spatial arrangement of counterions relative to the actin filament structure.

Main Results:

Related Experiment Videos

  • Counterions did not form a simple lattice but organized into "frozen" ripples, forming 1D charge density waves parallel to actin filaments.
  • These 1D counterion waves coupled with twist distortions in the actin filaments, creating attractions.
  • A cooperative molecular mechanism analogous to polaron formation was identified, mediating attractions via charge alignment.

Conclusions:

  • A novel, symmetry-breaking collective counterion mechanism generates attractions between like-charged polyelectrolytes.
  • This mechanism, involving 1D charge density waves and filament distortions, challenges conventional electrostatic understanding.
  • The findings have broad implications for electrostatics in aqueous media, relevant to colloidal and biomedical processes.