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Surface Viscosity, Diffusion, and Intermonolayer Friction: Simulating Sheared Amphiphilic Bilayers

Computational Dispersion Rheology, Faculty of Science and Technology, University of Twente, 7500 AE Enschede, The Netherlands

Correspondence: Address reprint requests to W. K. den Otter, Faculty of Science and Technology, University of Twente, PO Box 217, 7500 AE Enschede, The Netherlands. E-mail: w.k.denotter{at}utwente.nl.

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 one another, yielding the interlayer friction coefficient.

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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]