Structural Forces in Ionic Liquids: The Role of Ionic Size Asymmetry.

ABSTRACT: Ionic liquids (ILs) are charged fluids composed of anions and cations of different size and shape. The ordering of charge and density in ILs confined between charged interfaces underlies numerous applications of IL electrolytes. Here, we analyze the screening behavior and the resulting structural forces of a representative IL confined between two charge-varied plates. Using both molecular dynamics simulations and a continuum theory, we contrast the screening features of a more-realistic asymmetric system and a less-realistic symmetric one. The ionic size asymmetry plays a nontrivial role in charge screening, affecting both the ionic density profiles and the disjoining pressure distance dependence. Ionic systems with size asymmetry are stronger coupled systems, and this manifests itself bot

SUBMITTER: de Souza JP 

PROVIDER: S-EPMC9007453 | biostudies-literature | 2022 Feb

REPOSITORIES: biostudies-literature