Abstract

Abstract Structures and characteristics of water/oil interfaces at the molecular level are reviewed. Dynamic fluorescence anisotropy of Sulforhodamine 101 (SR101) and excitation energy transfer from SR101 to Acid Blue 1 (AB1) at water/oil interfaces were studied by using time-resolved total internal reflection (TIR) fluorometry. The results indicated that a water/carbon tetrachloride (CCl4) interface was sharp with respect to the molecular size of SR101 (∼10 Å), while a water/1,2-dichloroethane (DCE) interface was relatively rough compared to the water/CCl4 interface. The present results were also compared with those predicted from molecular dynamic simulations and the thermally capillary wave theory. Furthermore, on the basis of fluorescence dynamic measurements of Sulforhodamine B (SRB) adsorbed at a water/oil interface, a relationship between thickness/roughness and the polarity at the interface was discussed.

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