Abstract
Abstract Critical micelle concentration (cmc) values of dioctyl sulfosuccinate (AOT) in aqueous trisodium citrate (NaCit) solution were determined as functions of electrolyte concentration and temperature by using surface tension and EMF methods. Values of surface excess, counter ion binding constant (β), surface area, and standard free energies of micellization and adsorption of AOT were evaluated. Using fluorescence-quenching method, aggregation number and polarity index of AOT were also determined. A sudden increase in the value of β from almost 0.4 to 0.8, associated with a sudden increase in the aggregation number and decrease in the polarity index, was observed with a NaCit concentration of about 0.007 mol kg−1, which is considered to be due to change in the micellar shape of AOT. The present study confirms the special counter ion binding behaviour of AOT as an additional special feature of AOT.
Published Version
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