Abstract
Specific conductivities, densities, heat capacities, and enthalpies of dilution at 25‡C were measured forN,N,N-octylpentyldimethylammonium chloride (OPAC) in water-urea mixtures at various urea concentrations mu as functions of the surfactant concentration ms. From conductivity data, the cmc and the degree of the counterion dissociation Β of the OPAC micelles were calculated. The cmc increases linearly with increasingm u while Βvs. mu is a smooth concave curve. From the experimental thermodynamic data, the apparentY Φ and partialY 2 molar properties (volumes, heat capacities, and relative enthalpies) are derived as functions of mu andm s . The effect of urea on the dependences of the different properties on ms are discussed. From data in the premicellar region the standard partial molar volumesV 02 and heat capacitiesC 0p2 were evaluated. It was observed thatV 02 increases linearly withm u whileC 0p2 decreases. The properties of OPAC in the dispersed and micellized forms at the cmc were obtained and, therefore, the thermodynamic functions of micellization were calculated on the basis of the pseudo-phase transition model.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
L. V. Dearden and E. M. Woolley,J. Phys. Chem. 91, 2404 (1987).
E. Vikingstad and O. Kvammen,J. Colloid Interface Sci. 74, 16 (1980).
H. Hoiland and E. Vikingstad,J. Colloid Interface Sci. 64, 126 (1978).
G. Perron, R. De Lisi, I. Davidson, S. Genereux, and J. E. Desnoyers,J. Colloid Interface Sci. 79, 432 (1981).
S. Backlund, B. Bergenstal, O. Molander, and T. Warnheim,J. Colloid Interface Sci. 131, 393 (1989).
L. Espada, M. N. Jones, and G. Pilcher,J. Chem. Thermodyn. 2, 1 (1970).
G. Pilcher, M. N. Jones, L. Espada, and H. A. Skinner,J. Chem. Thermodyn. 1, 381 (1969).
G. M. Musbally, G. Perron, and J. E. Desnoyers,J. Colloid Interface Sci. 54, 80 (1976).
P. K. Singh, J. C. Ahluwalia, inSurfactants in Solution, K. L. Mittal, ed., (Plenum Press, New York, 1989).
S. Causi, R. De Lisi, S. Milioto, and N. Tirone,J. Phys. Chem. 95, 5664 (1991).
E. Caponetti, S. Causi, A. M. Floriano, R. De Lisi, S. Milioto, and R. Triolo,J. Phys. Chem. 96, 4950 (1991).
D.G. Archer, V. Majer, A. Inglese, and R.H. Wood,J. Colloid Inrerface Sci. 124, 591 (1988).
M. Tanaka, S. Kaneshina, K. Shin-No, T. Okajima, and T. Tomida,J. Colloid Interface Sci. 46, 132 (1974).
S. Milioto, S. Causi, R. Crisantino, and R. De Lisi,J. Thermal Anal. 38, 2693 (1992).
S. Milioto, M. S. Bakshi, R. Crisantino, and R. De Lisi,J. Colloid Interface Sci. 159, 354 (1993).
R. E. Verrall, S. Milioto, and R. Zana,J. Phys. Chem. 92, 3939 (1988).
R. De Lisi, V. Turco Liveri, M. Castagnolo, and A. Inglese,J. Solution Chem. 15, 23 (1986).
G. S. Kell,J. Chem. Eng. Data 12, 66 (1966).
J. E. Garrod and T. M. Herrington,J. Phys. Chem. 74, 363 (1970).
M. F. Stimson,Am. J. Phys. 23, 614 (1955).
R. De Lisi, G. Perron, and J. E. Desnoyers,Can. J. Chem. 58, 959 (1980).
C. Treiner,J. Colloid Interface Sci. 92, 444 (1982).
R. Zana, S. Yiv, C. Strazielle, and P. Lianos,J. Colloid Interface Sci. 80, 208 (1981).
L. Benjamin,J. Colloid Interface Sci. 22, 386 (1966).
R. De Lisi, E. Fisicaro, and S. Milioto,J. Solution Chem. 17, 1015 (1988).
R. N. Choudhury and J. C. Ahluwalia,J. Chem. Soc. Faraday Trans. I 77, 3119 (1981).
J. C. Ahluwalia and B. Chawla,J. Chem. Soc. Faraday Trans. I 69, 434 (1973).
T. S. Sarma and J. C. Ahluwalia,J. Phys. Chem. 76, 1366 (1972).
L. L. Bright and J. R. Jezorek,J. Phys. Chem. 79, 800 (1975).
J. H. Stern and J. D. Kulluk,J. Phys. Chem. 73, 2795 (1969).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
De Lisi, R., Marongiu, B., Milioto, S. et al. Thermodynamics ofN,N,N-octylpentyldimethyl-ammonium chloride in water-urea mixtures. J Solution Chem 26, 889–911 (1997). https://doi.org/10.1007/BF02768264
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF02768264