Effect of Hydrogen Bonding between Ions of like Charge on the Boundary Layer Friction of Hydroxy-Functionalized Ionic Liquids

Hua Li, Thomas Niemann, Ralf Ludwig, Rob Atkin

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Atomic force microscopy has been used to measure the lubricity of a series of ionic liquids (ILs) at mica surfaces in the boundary friction regime. A previously unreported cation bilayer structure is detected at the IL-mica interface due to the formation of H-bonds between the hydroxy-functionalized cations [(c-c) H-bonds], which enhances the ordering of the ions in the boundary layer and improves the lubrication. The strength of the cation bilayer structure is controlled by altering the strength of (c-c) H-bonding via changes in the hydroxyalkyl chain length, the cation charge polarizability, and the coordination strength of the anions. This reveals a new means of controlling IL boundary nanostructure via H-bonding between ions of the same charge, which can impact diverse applications, including surface catalysis, particle stability, electrochemistry, etc.

Original languageEnglish
Pages (from-to)3905-3910
Number of pages6
JournalJournal of Physical Chemistry Letters
Volume11
Issue number10
DOIs
Publication statusPublished - 21 May 2020

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