Volume 69, Number 4, February 2005
|Page(s)||650 - 656|
|Section||Interdisciplinary physics and related areas of science and technology|
|Published online||19 January 2005|
Shape fluctuations and elastic properties of two-component bilayer membranes
Max-Planck-Institut für Kolloid- und Grenzflächenforschung 14424 Potsdam, Germany
Accepted: 7 December 2004
The elastic properties of two-component bilayer membranes are studied using a coarse-grain model for amphiphilic molecules. The two species of amphiphiles considered here differ only in their length. Molecular-dynamics simulations are performed in order to analyze the shape fluctuations of the two-component bilayer membranes and to determine their bending rigidity. Both the bending rigidity and its inverse are found to be nonmonotonic functions of the mole fraction of the shorter B-amphiphiles and, thus, do not satisfy a simple lever rule. The intrinsic area of the bilayer also exhibits a nonmonotonic dependence on and a maximum close to .
PACS: 87.16.Dg – Membranes, bilayers, and vesicles / 82.70.-y – Disperse systems; complex fluids / 61.20.Ja – Computer simulation of liquid structure
© EDP Sciences, 2005
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