Executive Summary : | Ionic liquids that have been the most appealing solvents in the domain of research due to their high thermal and moisture stability, good solubility, non-inflammability, exceptional solvation ability, unique recyclability, etc. can be used for studying their interactions and improving biotechnological process efficiency. Furthermore, a lot of information is available on the thermodynamic characteristics of ionic liquids with various additions, as well as several investigations of organic salts with various additives. But thermodynamic characteristics of ionic liquids and organic salts are less explored. Moreover, when ILs are met with concentrated salt solutions, they can be induced to form aqueous biphasic systems, with an upper IL-rich phase and a lower salt-rich. Owing to their potential application in the creation of new “green” separation technologies for the development of clean manufacturing processes, these systems are attracting a lot of attention. Thermophysical investigations of aqueous solutions provide useful information for deciphering various types of interactions that are involved in a variety of biochemical and physiological processes. Physical properties like density, sound velocity, refractive index and others have a wide range of applications in describing physicochemical behavior and molecular interactions in aqueous and mixed aqueous solutions. These physical properties may be utilized to investigate the volumetric, acoustic and other thermodynamic properties which give insight into the forces that are present in the systems. In this research work, thermophysical investigations at various temperatures and concentrations will be employed to analyze molecular interactions of several organic salts in ionic liquids. The results will be further supported with certain spectroscopic and computational approaches. This will be effective in understanding the effect of specific salt on the physicochemical behavior of ionic liquids which is valuable to interpret the convoluted mechanism of multiple molecular interactions present in the systems, that are further helpful in the design and optimization of IL applications in the industrial and biological fields. Firstly, the intermolecular interactions of organic salts (like citrates, tartrates, etc.) and ionic liquids (like 1-butyl-3-methylimidazolium chloride, 1-ethyl-3-methylimidazolium ethyl sulfate, etc.) will be determined. Experimental studies like density, speed of sound and viscosity of mixtures of organic salts and ionic liquids in aqueous solutions will be carried out at different temperatures. Furthermore, utilizing mathematical equations and various software tools, the experimentally collected data will be utilized to determine the thermophysical and transfer parameters. Lastly, different theories will be applied to comprehend the interactions present in our systems. Various physicochemical parameters will be further justified by spectroscopic and computational methods. |