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Fluorescence technique for the determination of low critical micelle concentrations
Author(s) -
Mehreteab Ammanuel,
Chen Betty
Publication year - 1995
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02635778
Subject(s) - critical micelle concentration , fluorescence , micelle , pulmonary surfactant , quantum yield , yield (engineering) , chemistry , analytical chemistry (journal) , thermodynamics of micellization , photochemistry , chromatography , aqueous solution , materials science , organic chemistry , optics , physics , biochemistry , metallurgy
A technique for determining low critical micelle concentrations (CMC) by means of a hydrophobic fluorescence probe has been developed. The amount of the fluorescent probe at the CMC is so small that the effect of the probe on micelle formation is negligible. The fluorescence intensity was measured at fixed dye/surfactant ratios, and it decreased with concentration. A quantity proportional to fluorescent quantum yield was calculated and found to be high for concentrations of surfactant above the CMC and almost zero below the CMC, giving a distinct break in the quantum yield vs. the concentration curve.