The influence of shear flow on bilayer structures (vesicle and planar lamellar phases, La), formed inDDAB/lecithin ternary systems, is studied by means of conventional rheology, Rheo NMR, and opticalmicroscopy. The vesicles in the diluted (Lam1) phase are polydisperse multilamellae which turn intosmaller monodisperse vesicles under shear. The concentrated (Lam2) phase is formed by non-orientedlamellae that do not surprisingly exhibit any pronounced shear-induced alignment prior to the transitioninto giant multilamellar vesicles. The biphasic region (Lam1 + Lam2) shows a mosaic texture with a powderpattern indicating the prevalence of lamellae that transform into onions under shear.
Effect of shear on vesicle and lamellar phases of DDAB/lecithin ternary systems
COPPOLA, Luigi;NICOTERA, ISABELLA;
2011-01-01
Abstract
The influence of shear flow on bilayer structures (vesicle and planar lamellar phases, La), formed inDDAB/lecithin ternary systems, is studied by means of conventional rheology, Rheo NMR, and opticalmicroscopy. The vesicles in the diluted (Lam1) phase are polydisperse multilamellae which turn intosmaller monodisperse vesicles under shear. The concentrated (Lam2) phase is formed by non-orientedlamellae that do not surprisingly exhibit any pronounced shear-induced alignment prior to the transitioninto giant multilamellar vesicles. The biphasic region (Lam1 + Lam2) shows a mosaic texture with a powderpattern indicating the prevalence of lamellae that transform into onions under shear.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
