Abstract
The changes in the physicochemical properties of a cationic surfactant cetyldimethylethylammonium bromide (CDEABr) on the addition of two ionic liquids, namely, 1-butyl-3-methylimidazolium dicyanamide, [C4mim][dca], and 1-octyl-3-methylimidazolium chloride, [C8mim][Cl], were investigated. Different techniques which include conductivity method, fluorometry method, DLS studies, and UV–visible spectroscopy were employed in order to determine various properties like critical micelle concentration, CMC, aggregation number, peak diameter of aggregate micelles, and interaction parameters. [C8mim][Cl] causes more decrease in CMC and more increase in aggregation number. In the case of [C8mim][Cl], the presence of octyl chain length helps easy mixed micelle formation with CDEABr, whereas in case of [C4mim][dca] this does not happen because of the absence of long alkyl chain length. The presence of different alkyl chain lengths of ILs and the mixed micelle formation of [C8mim][Cl] is responsible for the different behavior towards micellization in aqueous cationic surfactant CDEABr.
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Acknowledgements
U. Farooq is thankful to UGC for providing the scholarship in the form of BSR (Basic Scientific Research), and N. A. Malik is thankful to Head Department of Chemistry, IUST, for providing the necessary facilities.
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Farooq, U., Malik, N.A. & Shalla, A.H. Thermodynamics of cosolvent effect of surface-active ionic liquids on the micellization of conventional surfactant. Colloid Polym Sci 299, 1237–1246 (2021). https://doi.org/10.1007/s00396-021-04845-2
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DOI: https://doi.org/10.1007/s00396-021-04845-2