| Issue |
Europhys. Lett.
Volume 42, Number 1, April 1998
|
|
|---|---|---|
| Page(s) | 103 - 108 | |
| Section | Cross-disciplinary physics and related areas of science and technology | |
| DOI | https://doi.org/10.1209/epl/i1998-00559-8 | |
| Published online | 01 September 2002 | |
Charge fluctuations and membrane attractions
Department of Materials and Interfaces,
Weizmann Institute, Rehovot, 76100 Israel
Received:
11
November
1997
Accepted:
16
February
1998
We consider the fluctuations of charges in
membranes and their effect on the
interactions between two fluid membranes a distance h apart.
For the case where the counterions
are highly localized in the membrane planes we find
that the attraction scales as 
at large distances
and as 1/h when the membranes are closer than
a typical screening length. When the counterions
are delocalized between the membranes a simple
ideal-gas approximation indicates that a primary
contribution to the membrane attraction are the
fluctuations of this gas; in some cases, these attractions
can exceed
the repulsive interactions found for uniform charge distributions
(the Poisson-Boltzmann or mean-field repulsions).
These results
may be relevant to understanding the role of
charge fluctuations in membrane attraction and adhesion.
PACS: 87.22.Bt – Membrane and subcellular physics and structure / 82.65.Dp – Thermodynamics of surfaces and interfaces
© EDP Sciences, 1998
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