Effects of charge and its fluctuation on membrane undulation and stability

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We study the electrostatic effects on the undulation of a flexible membrane with non-vanishing excess charges and charge fluctuation. It is shown that the membrane becomes unstable to a long-wavelength undulation due to Coulomb repulsion between excess charges on the membrane. This instability is suppressed both by charge fluctuation which induces an effective attraction and by free ions in solution which screen the Coulomb repulsion. Our result explains qualitatively spontaneous vesiculation and also its suppression by added salts observed for mixtures of ionic surfactants. The charge-fluctuation induced attraction, unless screened by the free ions, softens the membrane by reducing bending rigidity.
Publisher
E D P SCIENCES
Issue Date
2002-04
Language
English
Article Type
Article
Keywords

RODLIKE POLYELECTROLYTES; CURVATURE ELASTICITY; PHASE-BEHAVIOR; ELECTROSTATIC INTERACTIONS; SURFACTANT BILAYERS; NEUTRON-SCATTERING; VESICLES; ATTRACTION; MIXTURES; SYSTEMS

Citation

EUROPHYSICS LETTERS, v.58, no.1, pp.147 - 153

ISSN
0295-5075
DOI
10.1209/epl/i2002-00617-9
URI
http://hdl.handle.net/10203/79377
Appears in Collection
NT-Journal Papers(저널논문)
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