Study of the reaction between methyl 4-nitrobenzenesulfonate and bromide ions in mixed single-chain-gemini micellar solutions: kinetic evidence for morphological transitions.
The reaction between methyl 4-nitrobenzenesulfonate and bromide ions has been studied in mixed single-chain-gemini micellar solutions of n-dodecyltrimethylammonium bromide, DTAB, and dodecyl tricosaoxyethylene glycol ether, Brij(35), with alkanediyl-alpha-omega-bis(dodecyldimethylammonium) bromide, 12-s-12,2Br(-) (s=3,4,5). Kinetic micellar effects show that an increase in the solution mole fraction of the single-chain surfactant, X(single-chain), results in a diminution of the mixed micelles tendency to form spherocylindrical aggregates upon increasing surfactant concentration. The dependence of the surfactant concentration at which the sphere-to-rod transition occurs, C(*), on X(single-chain) showed through kinetic data was in agreement with results obtained by means of fluorescence measurements.
Departamento de Química Física, Universidad de Sevilla, C/Profesor García González 1, 41012 Sevilla, Spain.
María
M
del Mar Graciani
Amalia
A
Rodríguez
María Luisa
ML
Moyá
D001557:Benzenesulfonates / Q000737:chemistry*; D001965:Bromides / Q000737:chemistry*; D007477:Ions; D007700:Kinetics; D008823:Micelles; D015394:Molecular Structure; D012996:Solutions / Q000737:chemistry; D013499:Surface Properties
D001557:Benzenesulfonates; D001965:Bromides; D007477:Ions; D008823:Micelles; D012996:Solutions; C010233:methyl-4-nitrobenzenesulfonate