Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2004-12-15
Europhys. Lett., 69 (4), 650-656 (2005).
Physics
Condensed Matter
Soft Condensed Matter
To appear on Europhysics Letters
Scientific paper
10.1209/epl/i2004-10382-3
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 $x_{\rm B}$ 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 $x_{\rm B}$ and a maximum close to $x_{\rm B} \simeq 1/2$.
Imparato Alberto
Lipowsky Reinhard
Shillcock Julian C.
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