Abstract

The size and shape of the aggregates in the homogeneous isotropic micellar phase of the binary system ammonium perfluorooctanoate/heavy water (APFO/D2O) have been extensively investigated by small- and wide-angle X-ray scattering, optical polarizing microscopy, self-diffusion NMR, and electrical conductivity techniques, as a function of temperature and surfactant concentration. The experimental results strongly suggest that there is a change in the structure of the micellar aggregates where the micelles undergo a shape transition, changing from spherocylinder (rod-shaped), at low surfactant concentration (WA 28 wt % APFO).

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