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Determining Counterion Exchange Selectivities at Micelle Surfaces from Fluorescence Decay Measurements *
Author(s) -
Okano Laura T.,
Alonso Elena O.,
Waissbluth L. Oscar L.,
Quina Frank H.
Publication year - 1996
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1996.tb09625.x
Subject(s) - counterion , chemistry , micelle , selectivity , inorganic chemistry , quenching (fluorescence) , sodium , ion exchange , ionic bonding , sodium dodecyl sulfate , chloride , fluorescence , thiosulfate , salt (chemistry) , ion , chromatography , catalysis , organic chemistry , aqueous solution , sulfur , physics , quantum mechanics
A method for determining counterion exchange selectivities at the surface of ionic micelles from time‐resolved fluorescence quenching measurements is developed. This method is employed to determine selectivity coefficients for thiosulfate/chloride exchange at the surface of cati‐onic hexadecyltrimethylammonium chloride micelles (KTS/CI, = 1.1 ± 0.4) and for copper (II)/sodium exchange at the surface of anionic sodium dodecyl sulfate micelles (K Cu/Na = 1.3 ± 0.3). In both cases, the selectivity coefficients are found to be independent of detergent and added salt concentration.