Surfactant Aggregation Number and Polydispersity of SDS + 1-Pentanol Mixed Micelles in Brine Determined by Time-Resolved Fluorescence Quenching

Article abstract of DOI:10.1021/j100372a070

Size and polydispersity of sodium dodecyl sulfate (SDS) + 1-pentanol direct mixed micelles have been investigated by means of the time-resolved fluorescence quenching method in the system SDS/1-pentanol/water/NaCl ( = 0.0331 M, <1-pentanol> = 0.42 M, and = 6.5 g/L of water).This method reveals high polydispersity in micellar size.Several size distribution models have been tested.The one that best fits the data is a double Gaussian distribution which suggests that two populations of mixed micelles might be present in the solution, centered on the SDS mean aggregation numbers of 75 and 830.