The micellar sphere-to-road transition in CTAC-NaClO3 a fluorescence quenching study
The fluorescence decay of pyrene quenched by benzophenone in cetyltrimethyl ammonium chloride solutions has been studied. On addition of chlorate ions to the solution, a transition to long rod-like micelles are known to occur. The fluorescence decay pattern changes in the transition region, from a typical micellar quenching behaviour, following the equation suggested by Infelta, Thomas and Grätzel  via the type of decay suggested for polydisperse micelles (Almgren and Löfroth ) to a decay pattern which is independent of the chlorate concentration at high concentrations and follows an equation derived for quenching in infinite rods. The weight average aggregation numbers and the widths of the micelle size distributions were determined in the transition region.
Key wordsAggregation number of micelles fluorescence decay quenching of pyrene by benzophenone cetyltrimethylammoniumchloride solution transition to rod-likd micelles
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