The structure of water-in-oil microemulsions of sodium sulfosuccinate] was investigated by using FTIR spectroscopy. Two types of water were observed: interfacial and bulklike. The relative amounts are found to depend on the water-to-surfactant ratio and also on the solvent. Addition of salt was found to change the interactions between the interfacial water and the polar groups of AOT without changing the total amount of interfacial water.
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