S Fayzaz Zadeh - Faculty of Biological Sciences, Alzahra University, Tehran, ۱۹۹۳۸۹۳۹۷۳ I.R. Iran
P.S Pourhosseini - Faculty of Biological Sciences, Alzahra University, Tehran, ۱۹۹۳۸۹۳۹۷۳ I.R. Iran
F Najafi - Department of Resin and Additives, Institute for Color Science and Technology, Tehran, ۱۶۶۸۸۳۶۴۷۱ I.R. Iran

series of novel cationic urethane gemini surfactants with polymethylene spacer chain length of 2, 4 and 6 carbon atoms were studied. Electrical conductivity measurements were performed in aqueous solution at 25 C to obtain important system parameters such as the critical micelle concentration (CMC) as well as the average degree of micellar ionization (). The change of Gibbs free energy (ΔG°) of micellization was also calculated. Results show that at experimental conditions, the supramolecular nanomicelles self-assemble spontaneously and their CMC values vary with spacer chain length. Further, the average degree of micellar ionization (α) is mainly determined by the size of the gemini surfactant nanomicelles.

gemini surfactant, nanomicelle, conductivity , CMC