Thermodynamic study on micellization of tetradecyltrimethylammonium bromide surfactant in mixes methanol/ethanol/propanol +water and Ponceau 4R and Sunset yellow FCF dyes using of conductometric measurement
In this work, the micellization behavior of tetradecyltrimethylammonium bromide (TTAB) surfactant was investigated in aqueous solvent mixtures of methanol, ethanol and propanol on different mass fractions (10-30%) and aqueous solution of Ponceau 4R and Sunset yellow FCF dyes at concentrations (0.001-0.007mM) based on conductometric technique at T=(298-313)K. The critical micelle concentration (CMC) values and dissociation degrees of TTAB surfactant were determined. The obtained results showed that the CMC value increases with rising of methanol and ethanol mas fractions but the CMC value decreases with rising of propanol mas fractions. Also, the obtained results indicated that the CMC value decreases with concentration increasing of Ponceau 4R and Sunset yellow FCF dyes. In addition, thermodynamic properties such as the Gibbs energy, enthalpy and entropy of micellization were calculated as a function of temperature, dye concentration and alcohol mass fractions.
