Abstract
Effect of glycols viz., ethylene glycol (EG), diethylene glycol (DEG), triethylene glycol (TEG) and tetraethylene glycol (TeEG) on micellization parameter of cationic surfactant tetradecyletrimethyl ammonium bromide (TTAB) was examined by means electrical conductivity measurements. The critical micelle concentration (CMC), degree of counterion dissociation (α) and Gibbs energy of micellization (ΔGm) as well as Gibbs energy of transfer (ΔG t ) of surfactant tail from bulk phase to micellar phase as a functions glycol concentration at 303.15 K were evaluated. In ordered to obtain enthalpy (ΔHm) and entropy (ΔSm) of micellization, CMCs were determined in 10.0% of glycols in temperature range from 303.15 K to 323.15 K. Thermodynamic parameters of the micellization reveal that effectiveness of glycols to reduce micellization increases with concentration and with number of ethereal oxygen, [-O-]n in glycol molecule.
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