Effect of confinement on ionic liquids dynamics in monolithic silica ionogels: 1H NMR study

Abstract

(1)H MAS NMR and temperature-dependent relaxation time measurements were carried out for the first time on ionic liquids confined in monolithic silica matrices and enabled us to show that the ionic liquids' dynamics experienced only a very small slowing-down. The confinement preserved the ionic liquids' properties and, moreover, allowed liquid-like behaviour at temperatures below the crystallisation temperature of genuine ionic liquids. This study highlights the interest of the ionogel approach to all-solid state devices with genuine IL properties.

Self‐Regulative Nanogelator Solid Electrolyte: A New Option to Improve the Safety of Lithium Battery

“…The signals become significantly narrower, and no narrowing of the line occurs as the spinning rate increases, indicating that chemical shift anisotropy and dipolar interactions are averaged in confined ionic liquids 27. Thus we can conclude that in our samples, the mobility of confined ILEs was close to the mobility of liquid‐state ILEs 28. This finding could be interesting for various applications such as electrolytes for lithium‐ion batteries, lithium–sulfur batteries and lithium–air batteries.…”

Ionic liquid as plasticizer for europium(iii)-doped luminescent poly(methyl methacrylate) films

“…It is noteworthy that ionogels can contain 80 vol.% of ionic liquid, which was shown to retain liquid-like dynamics. 51 In the ionogel, the ionic liquid is the major component. In contrast, in the PMMA/ionic liquid films, the major component is still the polymer.…”

HR-MAS NMR Spectroscopy in Material Science

“…[49] In another study, the dynamics of IL's confined in monolithic silica ionogels were followed by 1 H HR-MAS NMR and relaxation experiments, and demonstrated that the IL maintained liquid like behavior with very little reduction in motions even as the pore size diminished from 12 nm to 1.5 nm. [50] Surprisingly, only a single 1 H HR-MAS NMR diffusion study of a non-biological LC material confined in nanopores has been reported. [51] …”