Synthesis and Thermophysical Properties of Low Viscosity Amino Acid-Based Ionic Liquids

Abstract

Nowadays ionic liquids are in the focus of scientific interest owing to their attractive properties. In this context, a series of amino acid-based ionic liquids (AAILs; EmimGly, EmimAla, EmimPro, and EmimSer) were synthesized and characterized by NMR and elemental analysis. Thermophysical properties such as density and viscosity were measured in the temperature range of T = (293.15 to 353.15) K and refractive index in the temperature range of T = (293.15 to 333.15) K. The thermal expansion coefficient values were calculated from the acquired experimental density values for T = (293.15 to 363.15) K. A thermogravimetric analyzer (TGA) was used to investigate the thermal degradation behavior of synthesized ionic liquids.

Understanding the physical properties, toxicities and anti-microbial activities of choline-amino acid-based salts: Low-toxic variants of ionic liquids

“…The values obtained for above synthesized ILs were also found similar to those reported for imidazolium, pyridinium, phosphonium, and ammonium-based ILs, (5.0×10 -4 to 6.5×10 -4 ) K -1 [20].…”

Synthesis and Thermophysical Properties of Hydrogensulfate Based Acidic Ionic Liquids

“…The apparatus was calibrated with organic solvents and ILs of known refractive index [15]. Samples were measured within the temperature range of 293.15-323.15 K with an accuracy of ±0.05 K and uncertainty of 4 9 10 -5 .…”

“…The procedure reported by [15] was followed. Thermal degradation was investigated in the temperature range of 323.15-773.15 K and at a heating rate of 10 KÁmin -1 .…”

“…Figure 1 shows the linear relation between density and temperature; when the temperature was increased from 293. 15 Standard uncertainty l is l(T) = 0.01 K and the combined expanded uncertainty is lc(q) = 5 9 10 -4 gÁcm -3 (level of confidence = 0.95) Density data were fitted to Eq. 1 [21], the parameters of which are shown in the Table 4.…”

The force field for imidazolium-based ionic liquids: Novel anions with polar residues

“…These data can be indirectly used to validate the performance of our new force field. For instance, Muhammad and coworkers [32] [pro] is 627 cP at 293 K. As temperature increases, viscosities decrease significantly, but M a n u s c r i p t the ratio between these values strictly persists. The size of the anion is a major factor determining shear viscosity.…”