Pressure and Temperature Dependence of Local Structure and Dynamics in an Ionic Liquid.

摘要: A detailed understanding of the local dynamics in ionic liquids remains an important aspect design new as advanced functional fluids. Here, we use small-angle X-ray scattering and quasi-elastic neutron spectroscopy to investigate structure a model liquid function temperature pressure, with particular focus on state points (P,T) where macroscopic dynamics, i.e., conductivity, is same. Our results suggest that initial step ion transport confined diffusion process, nanosecond timescale, motion restricted by cage nearest neighbors. This process invariant considering geometry, participation ratio, at constant isoconductivity. The connection nearest-neighbor underlined invariance peak factor corresponding correlations. At shorter timescales, picoseconds, two localized relaxation processes cation can be observed, which are not directly linked transport. However, these also show overall energy landscape responds same way density changes mainly governed interactions.