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Micellization Behavior of Cationic Gemini Surfactants in Aqueous‐Ethylene Glycol Solution
Author(s) -
Tikariha Deepti,
Kumar Birendra,
Singh Namrata,
Ghosh Kallol K.,
Quagliotto Pierluigi
Publication year - 2011
Publication title -
journal of surfactants and detergents
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.349
H-Index - 48
eISSN - 1558-9293
pISSN - 1097-3958
DOI - 10.1007/s11743-011-1280-5
Subject(s) - chemistry , critical micelle concentration , thermodynamics of micellization , gibbs free energy , micelle , ethylene glycol , aqueous solution , pulmonary surfactant , enthalpy , gibbs isotherm , aggregation number , surface tension , bromide , inorganic chemistry , cationic polymerization , organic chemistry , thermodynamics , biochemistry , physics
The micellization behavior of gemini surfactants i.e. alkanediyl‐α,ω‐bis(cetyldimethylammonium bromide) (C 16 ‐s‐C 16 ,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.