Structure and properties of confined sodium nitrite |
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| Authors: | Naberezhnov A Fokin A Kumzerov Yu Sotnikov A Vakhrushev S Dorner B |
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| Institution: | 1.Ioffe Physico-Technical Institute, 26 Politekhnicheskaya, 194021, St.-Petersburg, Russia,;2.Institute Laue Langevin, 6 rue Jules Horowitz, BP 156, 38042 Grenoble Cedex 9, France, |
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| Abstract: | We study the lateral and transverse diffusion of amphiphiles in two-component bilayer membranes, using a coarse-grained model
for amphiphilic molecules and combined Monte Carlo-Molecular Dynamics simulations. Membrane structural properties, such as
the mean thickness, are also measured. The dependence of such properties on membrane composition, inter-molecular interactions,
and amphiphile stiffness is determined. In particular, we show that addition of shorter amphiphiles drives the model membrane
towards a more fluid state, with increased amphiphile lateral diffusion rates. These results can be understood in the framework
of a simple free-volume model. Furthermore, we observe an increase in the trans-membrane diffusion when the interaction energy
of amphiphiles with their neighboring molecules is decreased.
Received: 6 December 2002 / Accepted: 17 April 2003 / Published online: 27 May 2003
RID="a"
ID="a"e-mail: imparato@mpikg-golm.mpg.de
RID="b"
ID="b"e-mail: shillcock@mpikg-golm.mpg.de
RID="c"
ID="c"e-mail: lipowsky@mpikg-golm.mpg.de |
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| Keywords: | PACS 82 70 -y Disperse systems complex fluids – 61 20 Ja Computer simulation of liquid structure |
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