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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