Influence of Temperature and Salt on Association and Thermodynamic Parameters of Micellization of a Cationic Gemini Surfactant
DOI:
https://doi.org/10.6000/1929-5030.2012.01.01.7Keywords:
Gemini surfactant, micellization, conductometry, thermodynamics, enthalpy – entropy compensation.Abstract
Association behavior of a gemini surfactant, N,N'-(ethane-1,2-diylbis(oxy))bis(2-oxoethane-2,1-diyl))bis(N,N-dimethylhexadecan-1-aminium) chloride, has been studied conductometrically at different temperatures (293.15 to 338.15 K) in aqueous and aqueous ethylene glycol (EG) solvents. The association studies were also performed in aqueous salt solution (sodium chloride, NaCl or sodium salicylate, NaSal). Critical micelle concentration (cmc) decreases and then increases with continuous increase in temperature (an U-shaped behavior). The temperature (Tm) corresponds to lowest cmc (cmcm) has been found ≈ 325 K for both the solvents (water and water + EG). However, cmc increases in mixed solvent (water + EG). The Tm has been shifted to lower temperature in the presence of salt. The shifting in Tm was dependent upon the nature of the counter ion. The cmc – temperature variation can be represented by a power law relationship. Relevant thermodynamic parameters have been evaluated and discussed on the basis of nature of the solvent / counter ion. The enthalpy – entropy compensation plots exhibit linearity. The compensation temperature (Tc) and enthalpy change (DH*mic) have been computed for various surfactant – solvent systems.
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2012-10-15
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Kumar, S., & Parikh, K. (2012). Influence of Temperature and Salt on Association and Thermodynamic Parameters of Micellization of a Cationic Gemini Surfactant. Journal of Applied Solution Chemistry and Modeling, 1(1), 65–73. https://doi.org/10.6000/1929-5030.2012.01.01.7
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