Ion Correlation-Driven Hysteretic Adhesion and Repulsion between Opposing Polyelectrolyte Brushes
Chao Duan,
Rui Wang
Abstract:Polyelectrolyte
(PE) brushes are widely used in biomaterials and
nanotechnology to regulate the surface properties and interactions.
Here, we apply the electrostatic correlation augmented self-consistent
field theory to investigate the interactions between opposing PE brushes
in a mixture of 1:1 and 3:1 salt solutions. Our theory predicts a
hysteretic feature of the normal stress induced by strong ion correlations.
In the presence of trivalent ions, the force profile is discontinuous:
repulsive in the compress… Show more
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