1 research outputs found
Dynamics of Liquid 1-Ethyl-3-Methylimidazolium Acetate Measured with Implanted-Ion <sup>8</sup>Li β-NMR
We demonstrate the application of implanted-ion -detected NMR as a
probe of ionic liquid molecular dynamics through the measurement of Li
spin-lattice relaxation (SLR) and resonance in 1-ethyl-3-methylimidazolium
acetate. The motional narrowing of the resonance, and the local maxima in the
SLR rate, , imply a sensitivity to sub-nanosecond Li solvation
dynamics. From an analysis of , we extract an activation energy meV and Vogel-Fulcher-Tammann constant K, in agreement with the dynamic viscosity of the bulk solvent.
Near the melting point, the lineshape is broad and intense, and the form of the
relaxation is non-exponential, reflective of our sensitivity to heterogeneous
dynamics near the glass transition. The depth resolution of this technique may
later provide a unique means of studying nanoscale phenomena in ionic liquids