Ionic liquids under nanoscale confinement

Abstract

The confinement of room-temperature ionic liquids (ILs) in nanoscale geometries, where at least one, but often all three dimensions are reduced down to lengths comparable to the anion-cation size, put the ILs into a quite different condition with respect to their bulk phase. An understanding of the properties of the ILs confined in a nanoscale-constrained geometry is of both fundamental and practical interest. In particular, the spatial restriction of ILs promotes a strong interaction of the ILs with the surface of the confining matrix, which strongly affects their properties, like the phase transition behavior, layering near surface walls, wetting, as well as ionic mobility. This short review is especially concerned with the interfacial confinement of ILs on solid substrates, in the form of very thin films, or inside porous nanomaterials.

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

“…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 ].…”

From Water Solutions to Ionic Liquids with Solid State Nanopores as a Perspective to Study Transport and Translocation Phenomena

“…Depending on the pore and analyte type, this associated conductivity may be fully dominated by surface effects or bulk effects. [94]…”

Cation effects on the properties of halloysite-confined bis(trifluoromethylsulfonyl)imide based ionic liquids

“…The properties of thickened ionic liquids have been thoroughly studied by a lot of researchers in the last few years in terms of their application in catalysis, production of membranes and electrochronic materials, lubricants, encapsulation of pharmaceutical preparations, as well as in such devices as actuators and sensors, solar cells, fuel cells, double-layer capacitors, lithium batteries and others. [6][7][8][9][10][11][12][13] However, ionogels remain largely underused because their interphase structure and dynamics have not been studied well yet. 4,[14][15][16] Clay minerals are quite promising in terms of ionogel preparation.…”