Pusle electron spin resonance and quasi-elastic light scattering of Winsor microemuslions
The interfacial region of Winsor microemulsions has been studied at the molecular level by electron spin echo modulation technique using doxyl stearic acid spin probes. We found that the water and oil molecules are located at opposite sides of the interface, and that the alcohol molecules are mainly located at the water side of the interface for all the microemulsions studied. Thus, alcohol, oil, and water molecules belong to well separated regions of the interface. No significant variation of the water and alcohol molecules distribution at the interface is observed in Winsor I and III microemulsions as a function of salt addition. The oil molecules, however, penetrate deeper into the interfacial film in Winsor I as compared to Winsor III microemulsions. The inner part of the interface of Winsor I and II microemuslions changes as a function of salt addition, whereas the outer part remains unchanged; in Winsor III microemulsions both the inner and the outer parts of the interface remain unchanged. This behavior is in agreement with the asymmetry in the interfacial properties expected for welldefined aggregates (w/o and o/w) and with the symmetry of the bicontinuous microemulsions interfacial film. Quasi-elastic light-scattering has been used to compare the structure of the Winsor microemulsions with and without probe addition and components deuteration.
Key wordsMicroemulsion interfacial film electron spin echo resonance quasi-elastic light-scattering nitroxide probe
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