Microscopic dynamics and the dynamic heterogeneity of motion of polar molecules in ionic liquids

摘要

We present a systematic study of the impact of different properties of alcohols and ionic liquid on the microscopic dynamics and the dynamic heterogeneity of motion of the components of imidazolium-based IL and alcohol solutions. The dynamics properties of ionic liquids - alcohol systems investigated include the effect of an increasing alkyl chain length of the alcohol (methanol, ethanol propanol, 1-butanol, and 1-pentanol). We offer a detailed account of the diffusion model for the polar substances in an ionic liquid. We report that the dynamic heterogeneity in these systems arises due to the hierarchical dynamics of fast and slow ions, as well as the dissolved polar matter at small times, and that this hierarchal dynamics determines the relaxation processes in the IL-based systems at intermediate lag times. (C) 2021 Elsevier B.V. All rights reserved.