Effect of Cation Symmetry on the Long-Range Ordering in Ionic Liquid Films.

ABSTRACT: This work investigates the role of ionic liquid (IL) ion (a)symmetry in promoting ordered structures within liquid films by studying a series of six alkylimidazolium cation isomers of varying symmetry paired with a bis(trifluoromethylsulfonyl)imide anion. The cation symmetry is varied by systematic variations in the alkyl tail lengths on either side of the imidazolium ring. IL films are extruded on a silver substrate using an in situ dynamic wetting apparatus and allowed to thin under shearing force due to gravity. Film thicknesses are monitored via spectroscopic ellipsometry. Infrared reflection absorption spectroscopy (IRRAS) with p-polarized light is used to analyze changes in dipole moments with vector components perpendicular to the substrate and thus report changes to molecular orien

SUBMITTER: Lasar CB 

PROVIDER: S-EPMC12825391 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature