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On the origin of oscillatory interactions between surfaces mediated by polyelectrolyte solution.

Jian Jiang1, Valeriy V Ginzburg2, Zhen-Gang Wang1

  • 1Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA.

The Journal of Chemical Physics
|December 12, 2019
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Summary

We investigated polyelectrolytes between surfaces, finding interactions depend on salt concentration. Repulsion barriers vary non-monotonically due to electric double layers and electrostatic correlations, unlike simpler models.

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Area of Science:

  • Polymer physics
  • Colloid science
  • Statistical mechanics

Background:

  • Understanding interactions between charged polymers and surfaces is crucial in fields like nanotechnology and biomaterials.
  • Confined polyelectrolyte systems exhibit complex behaviors influenced by electrostatic and entropic forces.

Purpose of the Study:

  • To quantify the effective interaction between two planar surfaces due to confined nonadsorbing polyelectrolytes.
  • To investigate the influence of polyelectrolyte and salt concentrations on these interactions.

Main Methods:

  • Numerical implementation of polymer classical density functional theory (CDFT).
  • Incompressibility condition applied to the polyelectrolyte system.
  • System studied: nonadsorbing polyelectrolytes confined between two planar surfaces.

Main Results:

  • Effective interaction includes short-range attraction (depletion) followed by repulsion (electric double layer and electrostatic correlations).
  • Repulsion barrier magnitude depends on salt concentration: electric double layer overlap at low salt, electrostatic correlations at high salt.
  • Oscillatory interaction profiles observed at moderate salt concentrations, attributed to electrostatic correlations.

Conclusions:

  • Classical density functional theory provides a more nuanced understanding of polyelectrolyte-mediated interactions than mean-field models.
  • Electrostatic correlations play a significant role in repulsion barrier behavior and can induce oscillatory interactions.
  • The interplay between electric double layer overlap and electrostatic correlations leads to non-monotonic repulsion barrier variations with salt concentration.