Self-Aggregation of Cationic Dimeric and Anionic Monomeric Surfactants with Nonionic Surfactant in Aqueous Medium

Abstract Spectrofluorometric measurements have been used to elaborate the self-aggregation of mixture of anioinic, sodium dodecylbenzenesulfonate (SDBS), and cationic gemini, alkanediyl-α, ω-bis (tetradecyldimethylammonium bromide) (14-4-14) with nonionic surfactant, polyoxyethylene 10 cetyl ether (Brij-56). The critical micelle concentration (cmc) of the binary mixtures has been investigated. Application of the regular solution theory (RST) to the experimental data yield the interaction parameter at mixed micelles (β), indicate an attractive interaction and reflect the synergistic behavior in both Brij-56/SDBS and Brij-56/14-4-14 systems. The micelle aggregation number (N agg) was measured using a steady state fluorescence quenching method. The N agg values of the mixed surfactant system were larger than those of pure components. The micropolarity of various combinations and the binding constants (K sv) were determined from the ratio of intensity of peaks (I 1/I 3) of pyrene fluorescence emission spectrum and its quenching, respectively. Keywords: Aggregation numbercritical micelle concentrationgemini surfactantmicropolarity Notes The literature values are given in parentheses. a Bakshi et al.[ Citation 30 ];. b Kabir-ud Din et al.[ Citation 31 ];. c Azum et al.[ Citation 32 ]. Color versions of one or more of the figures in the article can be found online at www.tandfonline.com/ldis.