An ionic liquid (IL) is a salt that consists of a cation and an anion, one of which possesses an organic component. Because of the non-volatile property, these solvents have a high recovery, and hence they are considered as environment-friendly green solvents. It is necessary to study the detailed physicochemical properties of these liquids for designing and processing techniques and find suitable operating conditions for IL-based systems. In the present work, the flow behavior of aqueous solutions of an imidazolium-based IL, 1-methyl-3-octylimidazolium chloride ([OMIM][Cl]), is investigated where the dynamic viscosity measurements indicate a non-Newtonian shear thickening behavior in the solutions. Polarizing optical microscopy shows the pristine samples to be isotropic that transforms into anisotropic after shear. This shear thickened liquid crystalline samples change into an isotropic phase upon heating which is quantified by the differential scanning calorimetry. The small angle X-ray scattering study revealed the pristine isotropic cubic phase of spherical micelles to distort into a non-spherical micelles. This has provided the detailed structural evolution of mesoscopic aggregates of the IL in an aqueous solution and the corresponding viscoelastic property of the solution.
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