Journal of Solution Chemistry

, Volume 39, Issue 10, pp 1501–1508 | Cite as

Investigation of the Thermodynamic Properties of the Cationic Surfactant CTAC in EG + Water Binary Mixtures

  • Jie Yan
  • Dong Wang
  • Fang Bu
  • Fei Fei Yang


To understand the thermodynamic characteristics of cationic surfactants in binary mixtures, the aggregation behavior of hexadecyltrimethylammonium chloride (CTAC) has been investigated in ethylene glycol (EG) + water solvent mixtures at different temperatures and EG to water ratios. The critical micelle concentration (CMC) and degree of counter ion bonding (β) were calculated from electrical conductivity measurements. An equilibrium model for micelle formation was applied to obtain the thermodynamic parameters for micellization, including the standard Gibbs energies of micellization (\(\Delta G_{\mathrm{mic}}^{\mathrm{o}})\), standard enthalpies of micelle formation (\(\Delta H_{\mathrm{mic}}^{\mathrm{o}})\) and standard entropies of micellization (\(\Delta S_{\mathrm{mic}}^{\mathrm{o}})\). Our results show that \(\Delta G_{\mathrm{mic}}^{\mathrm{o}}\) is always negative and slightly dependent on temperature. The process of micellization is entropy driven in pure water, whereas in EG + water mixtures the micellization is enthalpy driven.


Thermodynamic properties Critical micelle concentration CTAC EG 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    Abbott, L.N., MacKay, A.R.: Surfactant Applications. Curr. Opin Colloid Interface Sci. 4, 322–324 (1999) Google Scholar
  2. 2.
    Schramm, L.L.: Surfactants: Fundamentals and Applications. In: The Petroleum Industry, pp. 3–22. Cambridge University Press, Cambridge (2000) Google Scholar
  3. 3.
    Galan, J.J., Gonzalez-Perez, A., Del Castillo, J.L., Rodriguez, J.R.: Thermal parameters associated to micellization of dodecylpyridinium bromide and chloride in aqueous solution. J. Therm. Anal. Calorim. 70, 229–234 (2002) CrossRefGoogle Scholar
  4. 4.
    Perger, T.-M., Bester-Rogac, M.: Thermodynamics of micelle formation of alkyltrimethylammonium chlorides from high performance electric conductivity measurements. J. Colloid Interface Sci. 313, 288–295 (2007) CrossRefGoogle Scholar
  5. 5.
    Akhter, M.S., Alawi, S.M.: Aggregation of ionic surfactants in formamide. J. Colloids Surf. A, Physicochem. Eng. Aspects 173, 95–100 (2000) CrossRefGoogle Scholar
  6. 6.
    Akisada, H., Kuwahara, J., Noyori, K.: Critical micelle concentrations and interaction parameters of aqueous binary surfactant: ionic surfactant mixtures. J. Colloid Interface Sci. 288, 238–246 (2005) CrossRefGoogle Scholar
  7. 7.
    Nagarajan, R., Wang, C.-C.: Solution behavior of surfactant in ethylene glycol: Probing the existence of a CMC and of micellar aggregates. J. Colloid Interface Sci. 178, 471–482 (1996) CrossRefGoogle Scholar
  8. 8.
    Mehta, S.K., Chaudhary, S., Bhasin, K.K.: Spectral characterization and colloidal properties of 1-hexadecylpyridinium chloride in aqueous binary mixtures of different glycols. J. Colloid Interface Sci. 333, 646–654 (2009) CrossRefGoogle Scholar
  9. 9.
    Chen, L.J., Lin, S.Y., Huang, C.C: Effect of hydrophobic chain length of surfactants on enthalpy-entropy compensation of micellization. J. Phys. Chem. B 102, 4350–4356 (1998) CrossRefGoogle Scholar
  10. 10.
    Evans, D.F., Miller, D.D.: In: Friberg S.E., Lindman, B. (eds.) Organized Solutions. Surfactants in Science and Technology, pp. 33–45. Dekker, New York (1992) Google Scholar
  11. 11.
    Carnero Ruiz, C.: Thermodynamics of micellization of tetradecyltrimethylammonium bromide in ethylene glycol-water binary mixture. J. Colloid Polym. Sci. 277, 701–707 (1999) CrossRefGoogle Scholar
  12. 12.
    Sugihara, G., Era, Y., Funatsu, M., Kunitake, T., Lee, S., Sasaki, Y.: Micelle formation of dodecylammonium surfactant with mixed counterions: perfluorocarboxylate and alkanesulfonate ions. J. Colloid Interface Sci. 187, 435–442 (1997) CrossRefGoogle Scholar
  13. 13.
    Fujiwara, M., Okano, T., Nakashima, T.H., Nakamura, A.A., Sugihara, G.: A temperature study on critical micellization concentration (CMC), solubility, and degree of counterion binding of α-sulfonatomyristic acid methyl ester in water by electroconductivity measurements. J. Colloid Polym. Sci. 275, 474–479 (1997) CrossRefGoogle Scholar
  14. 14.
    Aguiar, J., Molina-Bolivar, J.A., Peula-Garcia, J.M., Carnero Ruiz, C.: Thermodynamics and micellar properties of tetradecyltrimethylammonium bromide in formamide-water mixtures. J. Colloid Interface Sci. 255, 382–390 (2002) CrossRefGoogle Scholar
  15. 15.
    Sadeghi, R., Hosseini, R.: Thermodynamic properties of surfactant sodium n-heptyl sulfonate in water and in aqueous solutions of poly(ethylene glycol) at different temperatures. J. Colloids Surf. A, Physicochem. Eng. Asp. 348, 177–185 (2009) CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  1. 1.School of Environmental Science and TechnologyDalian University of TechnologyDalianChina
  2. 2.School of Chemistry and Chemical EngineeringLiaoning Normal UniversityDalianChina

Personalised recommendations