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. © 1989 Taylor & Francis Ltd.
A thermodynamic and N.M.R. study of the ribbon lyotropic mesophases. An investigation of the potassium palmitate/potassium laurate/water system
Grasso, D.;La Rosa, C.;Chidichimo, G.;and Checchetti, A.
1989-01-01
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. © 1989 Taylor & Francis Ltd.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
