FLUORESCENCE PROBES STUDY ON THE MIXED CATIONIC-ANIONIC SURFACTANT SOLUTIONS

Pyrene and p-N, N-dimethylaminostyrylphenylmalononitrile are used as t he fluorescence probes to study the micro environment and observe the excimer formation of pyrene in sodium alkylcarboxylate and alkyltrimet hyl ammonium bromide mixed solutions. The micro polarity, micro-dielec tric constants and micro viscosity of the self-organized assemblies in the mixed cationic-anionic surfactant solution were compared before a nd after sonication, which may form different organized assemblies (mi celle or vesicle). The micelle and vesicles have almost the same polar ity for the probing molecules whereas the microviscosity differs. The variation of fluorescence quenching curves also shows the different ef fect of the change of assembly forms(micelles to vesicles). Thus some novel physicochemical properties about the micro environment of the ca tionic-anionic surfactant assemblies were found from this report.