Thermal Properties
Differential scanning calorimeter (DSC) was used to measure the thermal properties such as melting and crystallization temperatures of synthesized ionic liquids (DSC Q-100 thermal analyzer from TA instruments). Typically, 5±0.5 mg of tested sample was weighed in sealed aluminum pan and placed in the equipment chamber and maintaining continuous nitrogen flow at 50 mL/min. Both the heating and cooling cycles were performed at -100 to 100 ºC at the heating rate of 5 ºC/min. The melting and crystallization temperatures were determined by calculating the integrated area of concerned peaks. Thermal degradation temperature of ionic liquids was determined by thermo gravimetric analysis (TGA) using TA Q500 (TA Instruments, Inc., New Castle, DE, USA). Typically, 4-5 mg of sample was placed in α-Al2O3 crucible under continues nitrogen flow of 60 mL per min at the heating rate of 10 ºC/min from room temperature to 500 ºC.