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|Title:||Surface potential and polarity at the micelle-solution interface in AOT + water system|
|Keywords:||Solution chemistry;Surface potentials;Dielectric constants;Surfactants;Ionic surfactants;Anionic surfactants;Micellar interface;Polarity|
|Abstract:||Surface potential of sodium dioctylsulfosuccinate (AOT) micelles (a double-chained anionic surfactant with special properties), in aqueous medium near the critical micelle concentration has been computed by solving the Poission-Boltzmann equation and is found to be −117 mV. The effective dielectric constant at the water – AOT micelle interface has been determined spectrophotometrically by using different probes and is estimated to be ~ 54 ± 4. The polarity determined at the micellar interfaces shows dependence on the probe used, which is considered to be due to different solubilization sites for different probes. Methyl red and pyrene probes are not found to be suitable for estimating the dielectric constant.|
|ISSN:||O975-0975 (Online); 0376-4710 (Print)|
|Appears in Collections:||IJC-A Vol.48A(06) [June 2009]|
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