Abstract
Phase behavior of DODAB aqueous solution, prepared without sonication, was studied by adiabatic scanning calorimetry. Measurements revealed four phase transitions with the temperatures 35.2, 39.6, 44.6, and 52.4°C at heating and one transition at the temperature 40.4°C at cooling. The first three transitions at heating occur in unilamellar vesicles. The first and third transitions correspond to the subgel-gel and gelliquid phase transitions, corresponding enthalpy jumps are equal to 33 and 49 kJ/mol. The second transition appears after some aging and is similar to gel-ripple phase transition in a DPPC solution, with the enthalpy jump under the transition exceeding 7.4 kJ/mol. The transition occurs in unilamellar vesicles. The transition at the temperature 52.4°C occurs in another subsystem of the solution, which we believe to be multilamellar vesicles. The enthalpy jump at this transition is equal to 97 kJ/mol, and data analysis suggests that this is a subgel-liquid transition. The phase transition at cooling is the liquid-gel transition in unilamellar vesicles. During the measurements, a slow evolution of the solution occurs, consisting in a change of concentrations of unilamellar and multilamellar vesicles. This transformation mainly occurs at low temperatures.
Similar content being viewed by others
References
J. F. Nagle and S. Tristram-Nagle, Biochim. Biophys. Acta 1469, 159 (2000).
P. Saveyn, P. Van der Meeren, M. Zackrisson, T. Narayanan, and U. Olsson, Soft Matter 5, 1735 (2009).
C. R. Benatti, M. J. Tiera, E. Feitosa, and G. Olofsson, Thermochim. Acta 328, 137 (1999).
J. Cocquyt, U. Olsson, G. Olofsson, and P. Van der Meeren, Colloid Polym. Sci. 283, 1376 (2005).
R. O. Brito and E. F. Marques, Chem. Phys. Lipids 137, 18 (2005).
L. Coppola, M. Youssry, I. Nicotera, and L. Gentile, J. Colloid Interface Sci. 338, 550 (2009).
E. Feitosa, P. C. A. Barreleiro, and G. Olofsson, Chem. Phys. Lipids 105, 201 (2000).
E. Feitosa, F. R. Alves, E. M. S. Castanheira, M. Elisabete, and C. D. R. Oliveira, Colloid Polym. Sci. 287, 591 (2009).
M. Kodama, H. Hashigami, and S. Seki, Biochim. Biophys. Acta 814, 300 (1985).
E. E. Entov, V. A. Levchenko, and V. P. Voronov, Int. J. Thermophys. 14, 221 (1993).
V. P. Voronov, JETP 91(1), 144 (2000).
H. Aoki, T. Koto, and M. Kodama, J. Therm. Anal. Calorim. 64, 299 (2001).
Handbook of Optical Materials, Ed. by M. J. Weber (CRC Press, Boca Raton, Florida, United States, 2003).
Author information
Authors and Affiliations
Corresponding author
Additional information
The article is published in the original.
Rights and permissions
About this article
Cite this article
Voronov, V.P., Kuryakov, V.N. & Muratov, A.R. Phase behavior of DODAB aqueous solution. J. Exp. Theor. Phys. 115, 1105–1110 (2012). https://doi.org/10.1134/S106377611211012X
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S106377611211012X