Physicochemical studies of mixed surfactant microemulsions with isopropyl myristate as oil

- Composition dependent phase characteristics were studied for mixed microemulsions.
- A minimum in interfacial composition was found at an equimolar composition of mixed surfactants.
- Antagonism in the free energy of transfer was observed at this equimolar composition.
- The transfer process for mixed compositions was endothermic.
- Temperature-insensitive microemulsions were formed at equimolar compositions.