Probing the hydration friction of ionic interfaces at the atomic scale

Zibo Li, Qian Liu, Deliang Zhang, Yin Wang, Yuge Zhang, Qiang Li*, MD Dong*

*Corresponding author for this work

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

Abstract

Despite the extensive studies conducted in exploring friction in the aqueous environment, the mechanism of hydration friction remains not well understood. Herein, we directly probed hydration friction on mica-electrolyte interfaces with different hydrated alkali cations through a combination of three-dimensional atomic force microscopy and friction force microscopy. The atomic scale imaging of the hydration layers at the mica surface in different electrolyte solutions clearly revealed a correlation between the alkali cations and the structure of the hydration layers. Our detailed analysis showed that the hydration force was much higher at high ionic concentrations than that at low concentrations. The hydration friction coefficient was found to follow the trend K+< Na+< Li+< Cs+, which contrasts with the Hofmeister series, indicating that the hydration friction depends not only on the hydration strength of the alkali cations but also on the arrangement of the alkali cations at the interface. The results of this study provide deep insights into the origins of hydration friction, with potential implications for the development of new boundary lubrication in aqueous media.

Original languageEnglish
JournalNanoscale horizons
Volume7
Issue4
Pages (from-to)368-375
Number of pages8
ISSN2055-6756
DOIs
Publication statusPublished - Mar 2022

Keywords

  • INTERACTION FORCE
  • MICA SURFACES
  • LIQUID
  • LUBRICATION
  • ADHESION
  • WATER
  • ANGSTROM
  • FLUIDITY
  • CATIONS

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