Effects Of Solvent And Radiation On Rheological Property Of Room Temperature Ionic Liquids

Room temperature ionic liquids (RTILs) are a novel class of organic salts composed of cations and anions, melting at or close to room temperature. RTILs have many advantages over conventional organic solvents and most of them have good miscibility with organic solvents. Owing to their unique properties such as low vapor pressure, wide liquid range, high thermal stability, high conductivity, non-volatility, non-inflammation and large electrochemical window, etc., RTILs are recognized as green solvents and have attracted increasing interest in recent years.Detailed knowledge on the rheological behavior of mixtures of RTILs with organic solvents is important for the design of many chemical engineering processes such as synthesis and separation. In fact, there is a lack of detailed study on the rheological properties of RTILs and their mixtures with other solvents.Since ionic liquids may be applied in a variety of potential applications in nuclear industry and radiant chemistry, from both theoretical and practical points of view, knowledge of direct radiant effects on RTILs is also important. Up to now, however, very few studies have been attempted to illustrate the radiant effects on ionic liquids. There is no information available on the rheology of ionic liquids submitted to gamma radiation process and for this reason the current work in this thesis aimed to verify the rheological properties of ionic liquid when submitted to gamma irradiation.In this thesis, by means of ARES, rheologcial studies of binary mixtures of RTILs and ethanol were studied in detail. The effects of shear rate, temperature and concentration on viscosity were elucidated sufficiently. It was found that the addition of EtOH caused a substantial decrease in viscosity of the ionic liquid and the viscosity of binary mixtures could be described by an exponential equation. Arrhenius Equation and Power Law equations were applied to describe the respective effects of temperature and shear rate on viscosity.Moreover, in this paper the synthesis of ionic liquid [bmim][PF6] was introduced in detail, and Fourier Transform Infra-Red (FTIR) spectrum was used to characterize our solutions. The rheological properties of binary mixtures of [Bmim][PF6] and N,N-Dimethylformamide (DMF) were also carried out . Similar conclusions were drawn.Finally, rheological studies of gamma irradiated ionic liquids were carried out for...