Urea-Induced Decrease of Anion Selectivity in Surfactant Aggregates

摘要: Direct and indirect mechanisms have been used to explain the effect of urea on surfactant aggregates. By studying formation properties, anion selectivities, stabilities cationic zwitterionic micelles vesicles, we confirm previous evidence in favor direct mechanism (Langmuir 1995, 11, 1715). Differential fluorescence suppression 2,3-N-butylnaphthalimide by Br- Cl- is investigate a short time scale (nanoseconds) effects ion binding exchange vesicles. Enhanced degree dissociation decreased selectivity aggregates are observed. Micellar catalysis unimolecular decarboxylation 3-carboxy-6-nitrobenzoxazol studied additive long range (minutes) also shows reduced selectivity. Formation properties thermodynamically stable (cmc) nonstable (hydrodynamic radii molecular weight) measured obtain parameters for analysis. A...