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Biophys. J. BioFAST: First Published May 13, 2005. doi:10.1529/biophysj.105.062653
© 2005 by the Biophysical Society.

A more recent version of this article appeared on August 1, 2005.
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Sergey A Shkulipa
Wouter K den Otter
W J Briels
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BIOPHYSICAL THEORY AND MODELING

Surface viscosity, diffusion and intermonolayer friction: simulating sheared amphiphilic bilayers

Sergey A Shkulipa 1, Wouter K den Otter 1* and W J Briels 2

1 University of Twente
2 University ot Twente

* To whom correspondence should be addressed. E-mail: w.k.denotter{at}tnw.utwente.nl.

Submitted on March 11, 2005
Revised on April 8, 2005
Accepted on 2 May 2005


  Abstract
The flow properties of an amphiphilic bilayer are studied in molecular dynamics simulations, by exposing a coarse grained model bilayer to two shear flows directed along the bilayer surface. The first field, with a vorticity perpendicular to the bilayer, induces a regular shear deformation, allowing a direct calculation of the surface viscosity. In experiments this property is measured indirectly, by relating it to the diffusion coefficient of a tracer particle through the Saffman-Einstein expression. The current calculations provide an independent test of this relation. The second flow field, with a vorticity parallel to the bilayer, causes the two constituent monolayers to slide past oneanother, yielding the interlayer friction coefficient.

Key Words: bilayers, coarse grained, intermonolayer friction, molecular dynamics, surface viscosity




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W. K. den Otter and S. A. Shkulipa
Intermonolayer Friction and Surface Shear Viscosity of Lipid Bilayer Membranes
Biophys. J., July 15, 2007; 93(2): 423 - 433.
[Abstract] [Full Text] [PDF]


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Copyright © 2005 by the Biophysical Society.