Abstract
Abstract Lyotropic ternary mixtures of K-palmitate/K-laurate/water with different compositions have been investigated by 2H N.M.R., differential scanning calorimetry and thermo-volumetric analysis. The transitions between rectangular ribbon-like aggregates and lamellar structures have been characterized and explained on the basis of a theoretical model. Our results suggest that for ternary systems containing a small amount of short chain lipids the ribbon structure is more stable at low temperature. Moreover, the rectangular shape is favoured both by the segregation of the short chain lipids at the curved edges of the ribbon and by a tighter packing of the hydrocarbon chains in the same region.
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