Cyclic voltammetric technique for the determination of the critical micelle concentration of surfactants, self-diffusion coefficient of micelles, and partition coefficient of an electrochemical probe
- Central Leather Research Inst., Madras (India)
Critical micelle concentrations (cmc) of cetyltrimethylammonium bromide (CTAB) and cetylpyridinium chloride (CPC) surfactants in aqueous solution have been determined by using the cyclic voltammetric technique. (Co(en){sub 3})(ClO{sub 4}){sub 3} has been used as the redox-active electrochemical probe. The cmc values so obtained for the surfactants were found to be in good agreement with the literature values. The partition coefficient, K, of the electrochemical probe between water and surfactants in nonmicellar and micellar states was estimated using the peak current, i{sub p} and half-wave potential, E{sub 1/2} values. The self-diffusion coefficient, D{sub m}, interaction parameter, k{sub f}, and hydrodynamic radius of the micelles were also estimated. The results suggest that the probe is sensitive to the nature of surfactant as well as surfactant concentration.
- OSTI ID:
- 7241440
- Journal Information:
- Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 95:22; ISSN 0022-3654; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
AQUEOUS SOLUTIONS
CHLORINE COMPOUNDS
COBALT COMPLEXES
COMPLEXES
DATA
DIFFUSION
DISPERSIONS
EXPERIMENTAL DATA
FLUID MECHANICS
FUNCTIONS
HALOGEN COMPOUNDS
HYDRODYNAMICS
INFORMATION
MECHANICS
MICELLAR SYSTEMS
MIXTURES
NUMERICAL DATA
OXYGEN COMPOUNDS
PARTITION
PARTITION FUNCTIONS
PERCHLORATES
QUANTITY RATIO
SELF-DIFFUSION
SOLUTIONS
SURFACTANTS
TRANSITION ELEMENT COMPLEXES
VOLTAMETRY