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Abstract
A simple phenomenological model for the excess water phospholipid bilayer main phase transition is developed. The dependence of transition temperature and latent heat on chain length is calculated. Phase diagrams for binary mixtures with components differing in chain length by 2, 4 and 6 carbons are determined. It is found that there is phase separation in the gel state for a chain length difference of 6 carbons. Comparison of theory and experiment is discussed.