Dynamic properties of nano-confined water in an ionic liquid

阿部 洋*; 山田 武*; 柴田 薫

Journal of Molecular Liquids, 264, p.54 - 57, 2018/08

https://doi.org/10.1016/j.molliq.2018.05.006

Nano-confined water (a water pocket) was spontaneously formed using an ionic liquid (IL), 1-butyl-3-methylimidazolium nitrate ([Cmim][NO]), in [Cmim][NO]-HO and [Cmim][NO]-DO mixtures. The static average size of the water pocket in [Cmim][NO]-80 mol% DO has been estimated to be around 20, determined via small-angle neutron scattering measurements. In this study, the dynamics of the water pocket in the IL were directly examined using incoherent quasielastic neutron scattering. Using the H-D difference of a neutron incoherent scattering cross section, the extent of the diffusion of the water molecules in the water pocket was determined. The water pocket could be characterized due to the slow dynamics of the water compared with those of bulk water.