Abstract
Non-ionic water-in-oil microemulsions consisting of water and tetraethylene glycol dodecyl ether (C 12E 4) in n-decane, were examined at various compositions. The electron spin resonance (ESR) probing technique was used, in conjunction with static fluorescence experiments, for the study of the structural modifications imposed on the water core of the above microemulsions owing to the variation of the surfactant concentration [C 12E 4], and of the parameter R = [H 2O]/ [C 12E 4]. It was found that, depending on the microemulsion composition. ESR probes may reside in two different positions; one corresponding to the water core and the other to the micromembrane which separates the aqueous and the oil pseudophases.
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