Abstract
The influence of molecule “softness” on the thermodynamic behavior of membranes, on the character of the main phase transition, and on an anomalous increase in the distance between bilayers in the film (swelling) above the phase-transition temperature is studied. The formation of the so-called ripple phase in multilayer films (modulation in the membrane plane) below the phase-transition temperature and the role of such factors as the molecule parameters and the lipid-film thickness are considered. It is shown that swelling of a lipid film is caused by the fluctuation-induced tilt of the molecules and the corresponding decrease in the number of “soft” molecules, whereas the formation of the ripple phase is caused by fluctuations of the order parameter in the gel phase and the corresponding increase in the number of soft molecules.
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