Volume 111, Number 1, July 2015
|Number of page(s)||6|
|Section||Interdisciplinary Physics and Related Areas of Science and Technology|
|Published online||24 July 2015|
Dynamics of an asymmetric bilayer lipid membrane in a viscous solvent
1 York Centre for Complex Systems Analysis, University of York - York, YO10 5GE, UK
2 Academic Division of Medical Physics, University of Leeds - Leeds, LS2 9JT, UK
3 Institute for Soft Matter Synthesis & Metrology, Department of Physics, Georgetown University Washington DC, USA
Received: 3 April 2015
Accepted: 27 June 2015
Bilayer lipid membranes (BLMs) are an essential component of many biological systems, forming a functional barrier between the cell and the surrounding environment. When the membrane relaxes from a structural perturbation, the dynamics of the relaxation depends on the bilayer structure. We present a model of a BLM in a viscous solvent, including an explicit description of a “thick” membrane, where the fluctuations in the thickness of a monolayer leaflet are coupled to changes in the lipid density within that monolayer. We find dispersion relations describing three intuitive forms of bilayer motion, including a mode describing motion of the intermonolayer surface not noted previously in the literature. Two intrinsic length scales emerge that help characterise the dynamics; the well-known Saffman-Delbrück length and another, , resulting from the intermonolayer friction. The framework also allows for asymmetry in the BLM parameters between the monolayer leaflets, which is found to couple dynamic modes of bilayer motion.
PACS: 87.15.A- – Theory, modeling, and computer simulation / 87.16.D- – Membranes, bilayers, and vesicles / 87.16.dj – Dynamics and fluctuations
© EPLA, 2015
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