Journal
FLUID PHASE EQUILIBRIA
Volume 375, Issue -, Pages 23-29Publisher
ELSEVIER
DOI: 10.1016/j.fluid.2014.04.027
Keywords
Anionic surfactant; Critical micelle concentration; Conductance; H-1 NMR; Aggregation number
Funding
- UGC, India
- Government of India through the University Grants Commission, New Delhi [F. 41-328/2012 (SR)]
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The aggregation behavior of an anionic surfactant sodium dodecylsulphate (SDS) in aqueous system in the presence of 1-butyl-2,3-dimethylimidazolium tetrafluoroborate [bdmim][BF4], a trisubstituted ionic liquid (IL) has been studied. Critical micelle concentrations (cmcs) were determined from conductance measurements at a temperature range of 298.15-318.15K and using fluorescence probe at different wt% of IL. Results obtained from these methods are in good agreement with each other. An increase in cmc was observed for all the studied systems with increase in temperature as well as with increase in wt% of IL. Further the degree of dissociation, alpha and thermodynamic parameters viz, free energy of micellization, Delta G(m)(0) and entropy of micellization, Delta S-m(0) has been evaluated. The aggregation number, N-agg of aqueous SDS micelles in the absence and presence of different wt% of [bdmim][BF4] is determined by fluorescence quenching of pyrene. H-1 NMR measurements of post-micellar solutions have also been done to understand the different inter-molecular interactions of surfactant molecules in [bdmim][BF4]. (C) 2014 Elsevier B.V. All rights reserved.
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