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Nonzero ionic size and charge-correlation forces between fluid membranes.

Yang Li1, Bae-Yeun Ha

  • 1Department of Physics, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|February 9, 2005
PubMed
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We found that ion size significantly impacts charge-correlation attractions between like-charged membranes. Larger ion sizes enhance attraction at intermediate distances, influencing membrane interactions.

Area of Science:

  • Colloid and Surface Science
  • Physical Chemistry
  • Theoretical Biophysics

Background:

  • Like-charged membranes typically exhibit repulsion due to electrostatic forces.
  • Charge-correlation attractions can overcome this repulsion, particularly with localized counterions.
  • The influence of finite ion size on these attractions is not fully understood.

Purpose of the Study:

  • To theoretically investigate the effect of finite ion sizes on charge-correlation attractions between like-charged membranes.
  • To model membrane charges and counterions as a two-dimensional ionic fluid of hard spheres.
  • To analyze how ion size influences attraction strength and dependence on separation distance.

Main Methods:

  • Development of a two-dimensional Debye-Huckel theoretical approach.

Related Experiment Videos

  • Modeling of membrane charges and localized counterions as hard spheres of diameter D.
  • Examination of the attraction as a function of surface charge density, counterion valency, and separation distance (h).

    • Main Results:

    • Attraction strength increases with higher surface charge densities and counterion valency.
    • Ion sizes enhance attraction in intermediate separation ranges (h).
    • Attraction transitions to a D-independent universal behavior at large separations (h → ∞) and remains finite at zero separation (h → 0).

    Conclusions:

    • Finite ion sizes play a crucial role in modulating charge-correlation attractions between like-charged membranes.
    • The observed dependence on separation distance highlights the importance of ionic structure in membrane interactions.
    • Theoretical predictions align with experimental observations regarding ion size effects on membrane attractions.