Distribution of fluorocarbon quencher among micelles via pyrene fluorescence probe method |
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Authors: | T Asakawa A Saruta S Miyagishi |
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Institution: | (1) Department of Chemistry and Chemical Engineering Faculty of Engineering Kanazawa University Kanazawa 920, Japan, JP |
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Abstract: | Fluorescence-quenching of pyrene in micellar system has been investigated using 1,1,2,2-tetrahydroheptadecafluorodecylpyridinium
chloride (HFDePC). The new fluorocarbon quencher has a similar quenching ability as hexadecyl-pyridinium chloride (CPC) towards
pyrene in hydrocarbon micelles if only a quencher molecule is solubilized in a micelle. The fluorocarbon quencher randomly
distributed among micelles if the average occupancy number of probes per a micelle was small enough. The fluorescence behavior
of pyrene was examined for hexadecyl-trimethylammonium chloride (CTAC) and HFDePC mixtures. The variation of fluorescence
intensity gave second cmc, reflecting the micellar immiscibility of fluorocarbon and hydrocarbon surfactants. The second cmc
can be simulated by material balances of both surfactants supposing the coexistence of two kinds of mixed micelles. The fluorescence-quenching
behavior suggested the enhanced micellar immiscibility probably due to nonrandom distribution of fluorocarbon quenchers among
micelles.
Received: 13 March 1997 Accepted: 24 May 1997 |
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Keywords: | Cationic surfactant mixture fluorocarbon quencher micropolarity micellar immiscibility pyrene fluorescence quenching |
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