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Title: Micellization behavior of [C<sub>16</sub>-4-C<sub>16</sub>], 2Br<sup>–</sup> gemini surfactant in binary aqueous-solvent mixtures
Authors: Deepti
Ghosh, Kallol K
Quagliotto, Pierluigi
Keywords: Thermodynamics
Gemini surfactants
Solvent effect
Issue Date: Nov-2009
Publisher: CSIR
Abstract: The micellization behavior of a bis cationic gemini surfactant, C<sub>16</sub>H<sub>33</sub>N<sup>+</sup>(CH<sub>3</sub>)<sub>2</sub>-(CH<sub>2</sub>)<sub>4</sub>-N<sup>+</sup>(CH<sub>3</sub>)<sub>2</sub>C<sub>16</sub>H<sub>33</sub>, 2Br<sup>-</sup>, has been studied in binary aqueous mixtures of dimethyl sulfoxide, methanol, 1, 4-dioxane, dimethyl formamide and ethylene glycol by conductivity measurements at 300-320 K. The critical micelle concentration, degree of micellar ionization and thermodynamic parameters, i.e, Gibbs free energy, enthalpy, and entropy of micellization of the gemini surfactant<sub> </sub>have also been determined. The<i> </i>cmc increases whereas Gibbs free energy decreases with increasing volume percentage of organic solvents in the organic solvent-water binary mixture. The negative value of enthalpy of micellization indicates that the micellization process is exothermic.
Description: 1522-1526
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.48A(11) [November 2009]

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