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The edge effect in open lipid bilayers

Meisam. Asgari's picture

Highlights:

 A model for the free energy of the edge of an open lipid bilayer is derived.

The derivation is based on the interactions of the molecules comprising the edge.

The derived model can be employed to study pore growth in open lipid bilayers.

The model captures bending and torsional energies of the edge, in addition to the line tension.

The molecular origins of spontaneous curvatures and elastic moduli are investigated.

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Meisam. Asgari's picture

The question of whether or not the free energy of the edge of an open lipid bilayer depends upon its geometry, had been unanswered for years. Further, prior to this study, a specific form for the free-energy of the edge in terms of its geometric features had not been presented. In this article, a microphysical approach is applied to derive the free energy of the edge of an open lipid bilayer. The model shows the quadratic dependence of the edge energy to its normal and geodesic curvatures and its geodesic torsion. The presented model can be used to study the equilibrium equations of open lipid bilayers. 

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