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We studied the temperature and concentration dependence of the POPC/C12EO2/water ternary system and identified and characterized the different phases occurring. The thermal behaviour is slightly dependent on the surfactant to lipid molar ratio R9 11 . At low surfactant content the behaviour is similar to the binary lipid/water system. Similarly at low lipid contents the system behaves similarly to the surfactant/water mixture. However, at molar ratios R311 between 2 and 3 a new hexagonal phase forms which is peculiar to the mixture. 2 H NMR measurements indicated the existence of a lamellar phase containing also curved surfaces additional to the flat ones. The surface area per surfactant molecule was calculated to 0.23 nm 2 which is in good agreement with the cross-section of a paraffinic chain.

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