Abstract
The aggregation behavior of three AOT based ionic liquids have been investigated in aqueous medium in the presence of different concentrations i.e. (0.04, 0.08, 0.12, 0.16) mM of sodium bis(2-ethylhexyl) sulfosuccinate (NaAOT) at different temperatures (298.15, 308.15, 318.15) K. The AOT based ionic liquids have been successfully synthesized by replacing the cation of sodium bis(2-ethylhexyl) sulfosuccinate (NaAOT) with various pharmacologically active cations such as cholinium [Cho]+, tetraethylammonium [TEA]+, and tetrabutylammonium [TBA]+. The conductivity and surface tension measurements have been employed to understand their aggregation behavior by evaluating various thermodynamic and surface-active parameters such as standard free energy of micellization (ΔGm0), standard enthalpy of micellization (ΔHm0), standard entropy of micellization (ΔSm0), surface pressure at cmc(á́¨cmc), maximum surface excess concentration (Γmax), the minimum area of surfactant monomer at the air/water interface (Amin), the standard Gibbs free energy of adsorption (ΔGad0) and the free energy of a surface at equilibrium (Gmins).
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