par Bastogne, F.;David, Christiane 
Référence Journal of photochemistry and photobiology. A, Chemistry, 136, 1-2, page (93-101)
Publication Publié, 2000-08
Référence Journal of photochemistry and photobiology. A, Chemistry, 136, 1-2, page (93-101)
Publication Publié, 2000-08
Article révisé par les pairs
| Résumé : | The phase diagram of the 'N-alkylaldonamide-brine-decane-alcohol' system shows, in addition of the polyphasic Winsor I, III and II microemulsions, a large monophasic domain. Investigation of its structure by nuclear magnetic resonance (NMR) has determined three different zones: a bicontinuous microemulsion, a water-in-oil microemulsion and a solution of small surfactant aggregates solvated by water and butanol. The purpose of this paper is to confirm the existence of these three zones and their microstructure by introducing a fluorescent probe in the system. Pyrene has been chosen as a probe because its fluorescence is very sensitive to the polarity and viscosity of the medium and to local concentration. The well-known structure of the microemulsions in the polyphasic equilibrium has first been studied by the fluorescence method. The monophasic domain has then been investigated by the same method and the results correlated to the information obtained by fluorescence in the polyphasic systems and by NMR in the monophasic area. The evolution of pyrene fluorescence and the discontinuities in the measured fluorescence parameters observed at the boundaries of the three zones delimited by the NMR study support the previous conclusions concerning the microstructure of the monophasic area. © 2000 Elsevier Science S.A. All rights reserved. |
