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Issue 8, 2011
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Verifying scalings for bending rigidity of bilayer membranes using mesoscale models

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Abstract

The bending rigidity κ of bilayer membranes was studied with coarse grained soft repulsive potentials using dissipative particle dynamics (DPD) simulations. Using a modified Andersen barostat to maintain the bilayers in a tensionless state, the bending rigidity was obtained from a Fourier analysis of the height fluctuations. From simulations carried out over a wide range of membrane thickness, the continuum scaling relation κd2 was captured for both the Lα and Lβ phases. For membranes with 4 to 6 tail beads, the bending rigidity in the Lβ phase was found to be 10–15 times higher than that observed for the Lα phase. From the quadratic scalings obtained, a six fold increase in the area stretch modulus, kA was observed across the transition. The magnitude of increase in both κ and kA from the Lα to the Lβ phase is consistent with current experimental observations in lipid bilayers and to our knowledge provides for the first time a direct evaluation of the mechanical properties in the Lβ phase.

Graphical abstract: Verifying scalings for bending rigidity of bilayer membranes using mesoscale models

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Publication details

The article was received on 28 Aug 2010, accepted on 19 Jan 2011 and first published on 25 Feb 2011


Article type: Paper
DOI: 10.1039/C0SM00876A
Citation: Soft Matter, 2011,7, 3963-3966
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    Verifying scalings for bending rigidity of bilayer membranes using mesoscale models

    F. M. Thakkar, P. K. Maiti, V. Kumaran and K. G. Ayappa, Soft Matter, 2011, 7, 3963
    DOI: 10.1039/C0SM00876A

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