RESONANCE RAMAN-SPECTRA OF BLACK SOAP FILM CONTAINING DYE MOLECULE

Dye molecule brilliant yellow (BY) has been used as an acid-base probe in the study of the resonance Raman spectra of three kinds of microenvironments of the black soap film (BSF) containing BY, the BY-CTAB micellar solution, and the aqueous BY solution under various pH conditions. It has been revealed that BY bound to the sandwich interface of the BSF and that to the micellar interface show similar spectral changes, but the former owns the character of coexistence of acidic and basic structures in a relatively large range of pH values (neutral to basic). Further. investigations have demonstrated that BSF exhibits the buffer effect that the pH value of the aqueous core is insensitive to the pH change of the bulk solution.