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Related Experiment Videos

Charge-reversal instability in mixed bilayer vesicles.

Y Chen¹, P Nelson

¹Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.

Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics

|November 23, 2000

Summary

Vesicles formed from charged and neutral surfactants can reach adhesion saturation. Instead of full coverage, they spontaneously form attractive and repulsive zones, preventing further object binding.

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Area of Science:

Colloid and Surface Science
Biophysics
Materials Science

Background:

Bilayer vesicles composed of charged and neutral surfactants are common.
Vesicle membranes partially demix upon binding oppositely charged objects, with adhesion zones recruiting charged surfactants.

Purpose of the Study:

To investigate the phenomenon of adhesion saturation in mixed surfactant vesicles.
To explain the mechanism behind spontaneous partitioning into attractive and repulsive zones.

Main Methods:

Theoretical modeling of vesicle-object interactions.
Analysis of membrane demixing and counterion migration dynamics.

Main Results:

Vesicles can exhibit adhesion saturation, forming distinct attractive and repulsive zones.

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Repulsive zones arise from counterion migration, reversing local membrane charge.

Saturation is favored by high surface charge density, low ionic strength, and thin, impermeable membranes.

Conclusions:

Adhesion saturation is a key mechanism limiting vesicle-object binding.
This phenomenon explains experimental observations of limited adhesion.
The findings have implications for understanding self-assembly and interfacial phenomena.