Calorimetric evaluation of the acetone partition in AOT/water/isooctane microemulsions

The thermodynamic parameters of acetone partition in AOT/water/isooctane microemulsions have been evaluated by calorimetric measurements. From the dependence of the enthalpy of transfer on the surfactant concentration, the distribution constant between the oil and the micellar phase and the standard transfer enthalpy of acetone from oil to AOT micelles were evaluated. The analysis of the dependence of the distribution constant on the amount of water present in the microemulsions has provided information on acetone preferential binding site in microemulsion.