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Thermal undulations of lipid bilayers relax by intermonolayer friction at submicrometer length scales.

S A Shkulipa, W K den Otter, and W J Briels

Phys Rev Lett 96(17):178302 (2006) PMID 16712341

The time correlation functions of the thermal undulations of a lipid membrane have been studied by molecular dynamics simulations of a coarse-grained bilayer model. We observe a double-exponential decay, with relaxation rates in good agreement with the theory by Seifert and Langer, [Europhys. Lett. 23, 71 (1993)]. Intermonolayer friction resulting from local velocity differences between the two monolayers is shown to be the dominant dissipative mechanism for fluctuations with wave lengths below approximately -0.1 microm.

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