Micellization Behavior of Cationic Gemini Surfactants in Aqueous-Ethylene Glycol Solution |
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Authors: | Deepti Tikariha Birendra Kumar Namrata Singh Kallol K Ghosh Pierluigi Quagliotto |
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Affiliation: | 1.School of Studies in Chemistry, Pt. Ravishankar Shukla University,Raipur (C.G.),India;2.Dipartimento di Chimica Generale ed Organica Applicata e Centro di Eccellenza NIS,Università degli Studi di Torino,Torino,Italy |
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Abstract: | The micellization behavior of gemini surfactants i.e. alkanediyl-α,ω-bis(cetyldimethylammonium bromide) (C16-s-C16,2Br− where s = 3, 4, 10) in 10% (v/v) ethylene glycol solution was investigated by surface tension and conductometric measurements at
300 K. The critical micelle concentration, degree of micellar ionization, surface excess concentration, minimum surface area
per molecule of surfactant, surface pressure at the CMC and Gibbs energy of adsorption of the dimeric surfactants have also
been determined in the presence of different salts (NaCl, NaBr and NaI). The critical micelle concentration and degree of
micellar ionization values decrease significantly in the presence of sodium halides and follows the sequence NaCl < NaBr < NaI.
The free energy, enthalpy and entropy of micellization of dimeric surfactants in 10% (v/v) ethylene glycol solution were determined
using the temperature dependence of the critical micelle concentration. The standard free energy of micellization was found
to be negative in all the cases. |
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