Melting point depression of ionic liquids confined in nanospaces

Abstract

A new physical method was proposed to control the liquid properties of room temperature ionic liquids (RT-ILs) in combination with nanoporous materials; the melting point of ILs confined in nanopores remarkably decreases in proportion to the inverse of the pore size.

Use of ionic liquids in sol-gel; ionogels and applications

“…Moreover, 1 H MAS NMR spectra disclosed a magnetic susceptibility gradient, as evidenced by the lack of narrowing of signals when comparing FWHM from 400 to 9000 Hz spinning rates; the resulting distribution of chemical shifts was ascribed to the fact that IL species could be localised either at the centre of the pores (where magnetic susceptibility only arose from surrounding parent anions and cations), or at the wall neighbourhood (where magnetic susceptibility was also influenced by anisotropic constraints on close IL species). Effects of wall neighbourhood on structuration were also reflected by differential scanning calorimetry (DSC) [42,74]. In fact, even though confinement did not affect the glass transition, DSC disclosed the dramatic effect of confinement on both cold crystallization and melting, which even could be no longer observed on increasing the confinement, i.e.…”

Ionic Liquids Confined in Silica Ionogels: Structural, Thermal, and Dynamical Behaviors

“…Moreover, for ionogels with x = 1, the temperature of the first-order phase transition (melting) was clearly shifted to a lower value. Table 1 [20]. In case of an elastic scan using neutrons, quasielastic spectra are recorded with a fixed instrumental resolution as a function of the temperature.…”

Recent advances in the synthesis and applications of metal organic frameworks doped with ionic liquids for CO 2 adsorption

“…Over the past decade, the concept "supported ionic liquid phase (SILP)," has been developed [105][106][107][108][109][110]. Several porous materials have been used as supports for ILs, such as silica gels, mesoporous silica, activated carbons, or porous glasses, etc.…”

“…On the other hand, MOFs have been tested as potential adsorbents due to their high CO 2 adsorption capacity [110] and vast choice of organic linkers and metal oxides available, which gives rise to materials with unlimited textural properties and surface chemistry [111]. Thus, incorporation of ILs into MOFs seems to be an interesting new approach to obtain adsorbent materials with enhanced CO 2 affinity and selectivity.…”