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IJC-A Vol.48A [2009] >
IJC-A Vol.48A(06) [June 2009] >


Title: Surface potential and polarity at the micelle-solution interface in AOT + water system
Authors: Chanda, Snigdha
Ismail, Kochi
Keywords: Solution chemistry
Surface potentials
Dielectric constants
Surfactants
Ionic surfactants
Anionic surfactants
Micellar interface
Polarity
Issue Date: Jun-2009
Publisher: CSIR
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.
Page(s): 775-780
ISSN: O975-0975 (Online); 0376-4710 (Print)
Source:IJC-A Vol.48A(06) [June 2009]

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