Surface activity and modifying effects of 1-Naphthol, 2-Naphthol and 2,3-Dihydroxynaphthalene on self-assembled nanostructures of 1-Hexadecyl-3-methylimidazolium chloride (original) (raw)

Abstract

The nature of transition from ordinary micelles (of nanometer length scale) of surface active ionic liquid 1-Hexadecyl-3-methylimidazolium chloride, to wormlike micelles (WLM) (micrometer length scale), mediated by hydroxy aromatic π-electron systems 1-Naphthol, 2-Naphthol and 2,3-Dihydroxynaphthalene (2,3-DHN) in salt free condition have been studied under Newtonian as well as non-Newtonian flow regimes. Conductance and tensiometry show that the additives lower the CMC of the ionic liquid. The interaction parameter (β) of the systems at different mole fraction evaluated on basis of Rubingh’s Regular solution approach were negative at all SAIL/Additive compositions. UV-Vis spectroscopy showed that micelle-bound additives formed hydrogen bonds with interfacial water molecules. Increase in steady state fluorescence anisotropic measurements revealed that the additives increasingly partitioned within the micelles. 1H-NMR study confirmed that although the additives reside at the palisade...

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