Abstract
Perfluorinated surfactants, likewise their perhydrogenated analogs, give rise in water to micellar and liquid crystal phases, whose structures depend on the surfactant nature, on the temperature and on the composition. Microemulsions can also be formed in ternary systems containing an appropriate oil. Here we report on the characterization by Electron Spin Resonance and by X-ray and neutron scattering (SAXS and SANS, respectively) of ordered and disordered aqueous systems containing either a straight chain perfluorinated surfactant (ammonium perfluorooctanoate, NH4PFO) or more complex perfluoropolyethers (ammonium perfluoropolyether, NH4PFPE, and/or the corresponding oil). Small and large charged and neutral nitroxides have been used as paramagnetic probes inserted into binary and ternary systems. The possibility of perturbing the system by adding an hexogenous compounds is discussed, particularly for more diluted micellar solutions. The analysis of the ESR line shape of long chain spin probes inserted in micellar and lamellar phases and in the microemulsions allowed us to compare the behavior of the differently aggregated phases. These phases were also further proved by SAXS and SANS.
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Martini, G., Ristori, S., Gebel, G. et al. ESR and scattering studies of perfluorinated surfactants in ordered and disordered systems. Appl. Magn. Reson. 6, 29–50 (1994). https://doi.org/10.1007/BF03162480
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DOI: https://doi.org/10.1007/BF03162480