Theory of the asymmetric ripple phase in achiral lipid membranes

Details Theory of the asymmetric ripple phase in achiral lipid membranes Theory of the asymmetric ripple phase in achiral lipid membranes

2010-11-15

arxiv.org/abs/1011.3313v1

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

We present a phenomenological theory of phase transitions in achiral lipid membranes in terms of two coupled order parameters -- a scalar order parameter describing lipid chain melting, and a vector order parameter describing the tilt of the hydrocarbon chains below the chain-melting transition. Existing theoretical models fail to account for all the observed features of the phase diagram, in particular the detailed microstructure of the asymmetric ripple phase lying between the fluid and the tilted gel phase. In contrast, our two-component theory reproduces all the salient structural features of the ripple phase, providing a unified description of the phase diagram and microstructure.

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