• Ternary mixtures of alkyltriphenylphosphonium bromides (C12TPB, C14TPB and C16TPB) in aqueous medium: their interfacial, bulk and fluorescence quenching behaviour

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    • Keywords


      Alkyltriphenylphosphonium bromides; ternary mixed micelles; fluorescence quenching.

    • Abstract


      The self-aggregation behaviour of ternary mixtures of alkyl (C$_{12}^-$, C$_{14}^-$ and C$_{16}^-$) triphenylphosphonium bromides was studied by conductometry and tensiometry. The pure surfactants showed two Critical Micellar Concentrations (CMCs) by conductometry, but their ternary mixtures produce single CMC both by conductometry and tensiometry. The CMC values determined were found to be lower than that obtained from Clint equation suggesting synergistic interaction among the monomers within the micelles. Their bulk properties, like fraction of counterions bound to the micelles and free energy of micellization were evaluated. Interfacial parameters, like surface excess, minimum head group area of monomer and free energy of adsorption were also assessed. Interfacial adsorption was found to be more spontaneous than micellization. The head group area per monomer in ternary systems was larger than pure systems due to stronger electrostatic repulsion among the charged head groups. The values of the packing parameters supported the pure as well as ternary micelles to be spherical. The TPB surfactants efficiently quenched pyrene fluorescence; the performances of the homologues in this respect were assessed.

    • Author Affiliations


      Gargi Basu Ray1 Soumen Ghosh1 Satya P Moulik1

      1. Centre for Surface Science, Department of Chemistry, Jadavpur University, Kolkata 700 032
    • Dates

  • Journal of Chemical Sciences | News

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