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We report here on a system (cetylpyridinium chlorate in brine (1 M sodium chlorate)) where giant elongated micelles from. We compare its properties to that of solutions of polymers in a good solvent. The semi-dilute regime is reached at very low concentration with a large correlation length. This situation allows to investigate, using static and dynamic light scattering, the mass distribution and...
In dilute aqueous solutions of surfactants a succession of phases is generally observed, namely, solutions of globular then elongated flexible micelles (worm-like micelles) followed by the phases of fluid membranes (successively a lamellar phase and the L3 (sponge) phase). This is well accounted for by the continuous decrease of the spontaneous curvature of the surfactant film upon variation of some...
We present and discuss the oscillations observed in the small angle neutron scattering pattern of brine rich phases of surfactant for scattering vecotrs ranging from 0.1 to 0.5 Å−1. These oscillations are expected to reflect the form factor of the local structure of the surfactant aggregates. Adjustment of the data to the form factors for the previously assumed local structure indeed confirms the...
The static and dynamic properties of the L3 are measured (viscosity, light scattering, electric birefringence) and their evolution with dilution is discussed in terms of scaling laws derived from the free energy expression.
Information on interactions involved in the stability of lamellar phases are obtained by X-ray, neutron and light scattering investigations. In the phases swollen by brine, stability seems to be driven by thermally induced steric interactions. In the phases swollen by oil, the experimental results indicate that long-range repulsive interactions are responsible for the stability of the stack of lamellae.
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