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- W2083671711 abstract "The behavior of aqueous acridine orange in presence of submicellar anionic surfactants has been studied through UV–vis, fluorescence spectroscopy and surface tension measurements. An observed increase in absorption in the 510–580 nm region of the UV–vis spectra of the dye in submicellar solutions has been attributed to protonation of the dye in the dye-surfactant ion pair (PDSIP). This PDSIP formation takes place in addition to the well known induced dimerization of the close packed dye-surfactant ion pairs (DSIP) or complexes. The surface tension measurements clearly show two critical micelle concentrations (CMCs) in the dye-surfactant system: the lower one (CMCIP) corresponds to micellization of the DSIP, which behaves like a nonionic surfactant and the higher one (CMC*) corresponds to the normal micellization of the anionic surfactant. The efficiencies of the DSIP and the anionic surfactant in the systems have been determined. The PDSIP is formed in the DSIP micelles and/or in the a/w interfacial monolayer. The observed changes in the fluorescence intensity indicate that the PDSIP gradually breaks down and the dye resides in a highly polar surface region of surfactant-rich surfactant-DSIP mixed micelles as the surfactant concentration approaches the CMC* before it moves towards the core of the normal micelles above the CMC*." @default.
- W2083671711 created "2016-06-24" @default.
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- W2083671711 date "2013-02-01" @default.
- W2083671711 modified "2023-10-16" @default.
- W2083671711 title "Protonation of acridine orange in dye-surfactant ion pair micelles" @default.
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- W2083671711 doi "https://doi.org/10.1016/j.molliq.2012.09.025" @default.
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