Counterion binding on mixed anionic/cationic micelles |
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Authors: | N Filipovi?-Vincekovi? D ?krti? |
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Institution: | (1) Present address: Ruder Bokovi Institute, Zagreb, Yugoslavia |
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Abstract: | Measurements of counterion binding in mixtures of surfactant aqueous solutions have been performed to study the structure of the anionic/cationic mixed micelle/solution interface. The mixtures studied were SDS/DDAC and STS/TDPC. The binding of chloride and sodium ions to mixed anionic/cationic micelles was measured using ion-specific electrodes. Counterion binding was found to be strongly dependent on the molar ratio of surfactants present. The mixed micelle/solution interface includes the headgroups of both surfactants and counterions of surfactant in excess. The addition of oppositely charged surfactant caused an increasing dissociation of counterions. |
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Keywords: | Surfactant aqueous solutions mixtures of surfactants structure of interfaces counterion binding |
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