Characterization of micellar solutions using surfactant ion electrodes
Surfactant ion electrodes were used to investigate the dimerization, aggregation, and micelle formation occurring at 25 C in aqueous solutions of sodium dodecyl sulfate, decyltrimethylammonium bromide, tetradecyltrimethylammonium bromide (TTAB), and orange II (4-((2-hydroxy-1-naphthalenyl) acid monosodium salt) as a function of added electrolyte. The surfactant electrodes, which contained a liquid membrane ion exchanger, permitted a direct determination of the surfactant monomer activity. Analysis of these data gave an association constant of 1000 for orange II, an estimated fractional charge on the DTAB micelle of 0.78, a dimerization constant of 400 (l/m) for TTAB, and a second break above the commonly accepted critical micelle concentration for sodium dodecyl sulfate, a break which may result from an ordering of the micelles. 20 references.
- OSTI ID:
- 6170738
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 84:6; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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AGGLOMERATION
ALKALI METAL COMPOUNDS
AMMONIUM COMPOUNDS
AQUEOUS SOLUTIONS
BROMIDES
BROMINE COMPOUNDS
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
DIMERIZATION
DISPERSIONS
DISPLACEMENT FLUIDS
ELECTRODES
FLUIDS
HALIDES
HALOGEN COMPOUNDS
MICELLAR SYSTEMS
MIXTURES
OXYGEN COMPOUNDS
PARTICLES
POLYMERIZATION
QUANTITY RATIO
SODIUM COMPOUNDS
SODIUM SULFATES
SOLUTIONS
SULFATES
SULFUR COMPOUNDS
SURFACTANTS