Self-Aggregation of Cationic Dimeric and Anionic Monomeric Surfactants with Nonionic Surfactant in Aqueous Medium |
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Authors: | Naved Azum Malik Abdul Rub Abdullah M. Asiri Khalid A. Alamry Hadi M. Marwani |
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Affiliation: | 1. Center of Excellence for Advanced Materials Research, King Abdulaziz University , Jeddah , Saudi Arabia;2. Chemistry Department , Faculty of Science, King Abdulaziz University , Jeddah , Saudi Arabia;3. Chemistry Department , Faculty of Science, King Abdulaziz University , Jeddah , Saudi Arabia |
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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. |
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Keywords: | Aggregation number critical micelle concentration gemini surfactant micropolarity |
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