1,721,096 research outputs found
Static and Dynamic Properties of Solutions of Strongly Interacting Ionic Micelles
No full textThe authors report on light scattering measurements performed on ionic micelles of biological glycolipids in very low ionic strength aqueous solution. The system differs fundamentally with respect to solutions of macromolecules or inorganic colloids, because the micelle is a spontaneous aggregate, its electric charge is unknown a priori, and the system may present an intrinsic polydispersity. The static and dynamic light scattering data are compared with calculations based on the HNC approximation
The Critical Exponents of Nonionic Micellar Solutions Near the Cloud Point, in: Physics of Complex and Supermolecular Fluids
No full text
Static and Dynamic Light Scattering Study of Solutions of Strongly Interacting Ionic Micelles
No full textDilute solutions of ionic micelles formed by biological glycolipids (gangliosides) have been investigated at very low ionic strength by static and dynamic light scattering. With no added salt the effect of electrostatic interactions is so strong that both the scattered intensity and the measured diffusion coefficient are different by an order of magnitude with respect to the values obtained for weakly interacting micelles. The electric charge of the micelle is derived by a fit of the experimental structure-factor data which uses the hypernetted chain approximation for the radial distribution function. The dependence of the diffusion coefficient on the ionic strength is partially explained by considering, in addition to hydrodynamic interactions, effects due to the non-negligible size of the Na+ and Cl- ions. The measured intensity correlation function deviates from exponential behaviour at extremely low ionic strength
Mixed Micelles of Gangliosides
No full textThe aggregation number and the hydrodynamic radius of micelles formed by mixtures of two distinct gangliosides (biological glycolipids) have been measured by static and dynamic light scattering and small-angle neutron scattering. The experimental data indicate that a nonideal mixing of the two amphiphiles occurs in the mixed micelle and that the shape of the mixed micelle may become more asymmetrical than that of the micelles of the pure gangliosides
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