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The bulk self diffusion of the ethylammonium cation and the nitrate anion canboth be described by respective single diffusion coefficients. Diffusion of theanion is 1.7 times higher than that of the cation. This indicates no tightassociation of the ions in the ionic liquid. For the ethylammonium cationconfined between glass plates the effective diffusion coefficient along, aswell as normal to the confining glass plates is higher by a factor of 1.86 ascompared to that in the bulk. The same time, NMR T2 relaxation of protons ofNH3 group of the EA cation is faster by a factor of 22 than that in bulk. 2HNMR spectra of selectively labeled CH2 and CH3 groups of EA do not demonstrateany ordering of the EA between the glass plates. We suggested that these datafavor a model where a bulk isotropic sponge like structure of EAN is saved inthe confinement, but sizes of connecting channels increases. Those leads tofaster translational diffusion and faster exchange processes of protons of NH3group, in comparison with the bulk.

Acceleration of diffusion in ethylammonium nitrate ionic liquid confined between parallel glass plates