Electrostatic Repulsion of Positively Charged Vesicles and Negatively Charged Objects

Details Electrostatic Repulsion of Positively Charged Vesicles and Negatively Charged Objects Electrostatic Repulsion of Positively Charged Vesicles and Negatively Charged Objects

1999-07-15

arxiv.org/abs/cond-mat/9907225v1

Science 285 (1999) 394--397

Physics

Condensed Matter

Soft Condensed Matter

Latex using epsfig and afterpage; pdf available at http://www.physics.upenn.edu/~nelson/Mss/repel.pdf

Scientific paper

A positively charged, mixed bilayer vesicle in the presence of negatively charged surfaces (for example, colloidal particles) can spontaneously partition into an adhesion zone of definite area, and another zone that repels additional negative objects. Although the membrane itself has nonnegative charge in the repulsive zone, negative counterions on the interior of the vesicle spontaneously aggregate there, and present a net negative charge to the exterior. Beyond the fundamental result that oppositely charged objects can repel, our mechanism helps explain recent experiments on surfactant vesicles.

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