J. Phys. IV France 03 (1993) C4-317-C4-319
Positron studies on reverse micellar systems of AOT/isooctane/waterM.F. FERREIRA MARQUES1, C. LOPES GIL2, A.P. DE LIMA2, H.D. BURROWS3 and M. DA GRAÇA MIGUEL3
1 Instituto Superior de Engenharia, 3000 Coimbra, Portugal
2 Departamento de Física da Universidade, 3000 Coimbra, Portugal
3 Departamento de Química da Universidade, 3000 Coimbra, Portugal
AOT/Isooctane and water/AOT/Isooctane systems have been studied by positron annihilation techniques. Studies of the binary system show that AOT is a strong positron scavenger and support the idea of polydisperse aggregates. Results, for the ternary system, indicate the presence of monomers, even when aggregates are present, and show that Ps is in a water-free region. The effects of the addition of nitrobenzene, sodium nitrobenzoate and 4-phenylbutyric acid to the ternary system are studied. Ps reveals high reactivity towards nitrobenzene which is shown to be present both in isooctane and inside the aggregates.
© EDP Sciences 1993