Determination of critical micelle concentration of cetyltrimethylammonium bromide: Different procedures for analysis of experimental data

• Main Authors: Goronja Jelena M., Janošević-Ležaić Aleksandra M., Dimitrijević Biljana M., Malenović Anđelija M., Stanisavljev Dragomir R., Pejić Nataša D.
• Format: Article
• Language: English
• Published: Association of Chemical Engineers of Serbia 2016-01-01
• Series: Hemijska Industrija
• Subjects: acetonitrile-water mixture; cetyltrilmethyammonium bromide; conductometry; critical micellar concentration
• Online Access: http://www.doiserbia.nb.rs/img/doi/0367-598X/2016/0367-598X1500055G.pdf
• ISSN: 0367-598X; 2217-7426

Conductivity of two micellar systems was measured in order to determine critical micelle concentration (CMC) of cetyltrimethylammonium bromide (CTAB). Those systems were: CTin water and CTin binary mixture acetonitrile (ACN)-water. Conductivity (κ)-concentration (c) data were treated by four different methods: conventional method, differential methods (first and second derivative) and method of integration (methods A-D, respectively). As CTin water micellar system shows a sharp transition between premicellar and postmicellar part of the κ/c curve, any of the applied methods gives reliable CMC values and there is no statistically significant difference between them. However, for CTin ACN-water mixture micellar system the integration method for CMC determination is recommended due to a weak curvature of κ/c plot.