The confinement and anion type effect on the physicochemical properties of ionic liquid/halloysite nanoclay ionogels

Enhancing the Thermal Stability of Ionogels: Synthesis and Properties of Triple Ionic Liquid/Halloysite/MCC Ionogels

“…Comparing the data presented in Table 2 and Table 3 , one can see that, for the IL/Hal ionogel (without MCC), the glass-transition temperature was 12 °C higher than that for pure IL. A similar increase in the T g value (by 4 °C) was observed for the IL/Hal ionogels based on 1-butyl-3-methylimidazolium dicyanamide [ 26 ]. This indicates a confinement effect, i.e., a change in the properties of ILs upon intercalation into the clay.…”

“…The data presented indicate a slight decrease in the basal distance d 001 in the clay mineral. It can be assumed that the decrease in the interlayer space is probably associated with the removal of residual water molecules due to the hydrophilic nature of IL anions and the polymer macromolecules [ 26 ].…”

“…Moreover, for the IL/Hal/MCC-4 composite, lower characteristic phase-transition temperatures were observed compared to those for the composites without polymer ( Table 3 ). It should be noted that the confinement effect is caused by the strong interaction of the ionic liquid with the inner surface of halloysite nanotubes [ 6 , 26 , 27 , 28 ].…”

“…It was recently shown [ 26 ] that imidazolium ILs (such as BMImDCA, BMImOtf and BMImTFSI) confined in a halloysite matrix decomposed more readily than bulk ILs. The data presented in Table 4 and Table 5 indicate that this conclusion is also true for the BMImAc studied in the current work.…”

“…In recent papers [ 26 , 33 ], the electrical conductivity electrophysical parameters of several IL/clay ionogels have been reported, with the conclusion that the specific conductivity ( κ ) for the IL entrapped by clay differed from that of the bulk IL. Therefore, it is interesting to study the electrical conductivity of IL/clay ionogels that are further modified with a polymer.…”