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Nano Research 2023, 16(1): 1096-1100 https://doi.org/10.1007/s12274-022-4653-3
Research Article | Issue | Published: 30 July 2022

The role of hydrated anions in hydration lubrication

Show Author's Information Zibo Li1,§,  Qian Liu1,2,§,  Qiang Li1( ),  Mingdong Dong2( )
Key Laboratory of Colloid and Interface Chemistry of the Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China
Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Aarhus C DK-8000, Denmark

§ Zibo Li and Qian Liu contributed equally to this work.

Keywords:
friction, hydration lubrication, hydration structures, anions, three-dimensional atomic force microscopy (3D-AFM)
Topics:
Imaging techniqueScanning probe microscopy
Cite this article:
Li Z, Liu Q, Li Q, et al. The role of hydrated anions in hydration lubrication. Nano Research, 2023, 16(1): 1096-1100. https://doi.org/10.1007/s12274-022-4653-3
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Abstract Full text Electronic supplementary material About this article

Hydration lubrication has long been invoked to account for the ultralow sliding friction between charged surfaces in aqueous environments, but still not well understood at molecular-level. Herein, we explored the lubrication effect of hydrated halogen anions on positively charged surface at the atomic scale by using three-dimensional atomic force microscopy and friction force microscopy. Atomically resolved three-dimensional imaging revealed that the anion layer was topped by a few hydration layers. The mechanical properties of the hydration layers were found mainly dependent on the concentration of electrolyte solutions and independent of the species of hydrated anions. Atomic-scale friction experiments showed that the hydration friction coefficient and friction dissipation at low concentrations were orders of magnitude lower than that at high concentrations and in pure water. Superlubricity can be achieved in low concentration electrolyte solution. These results indicated that the changes of electrolyte solution concentrations led to different adsorption state of anions on the positively charged surface which gave rise to the difference of the friction behaviors. The findings in this study reveal the role of hydrated anions in hydration lubrication and provide deep insights into the origins of hydration lubrication.


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Electronic supplementary material
About this article

The role of hydrated anions in hydration lubrication

Show Author's information Zibo Li1,§, Qian Liu1,2,§, Qiang Li1( ), Mingdong Dong2( )
Key Laboratory of Colloid and Interface Chemistry of the Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China
Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Aarhus C DK-8000, Denmark

§ Zibo Li and Qian Liu contributed equally to this work.

Abstract

Hydration lubrication has long been invoked to account for the ultralow sliding friction between charged surfaces in aqueous environments, but still not well understood at molecular-level. Herein, we explored the lubrication effect of hydrated halogen anions on positively charged surface at the atomic scale by using three-dimensional atomic force microscopy and friction force microscopy. Atomically resolved three-dimensional imaging revealed that the anion layer was topped by a few hydration layers. The mechanical properties of the hydration layers were found mainly dependent on the concentration of electrolyte solutions and independent of the species of hydrated anions. Atomic-scale friction experiments showed that the hydration friction coefficient and friction dissipation at low concentrations were orders of magnitude lower than that at high concentrations and in pure water. Superlubricity can be achieved in low concentration electrolyte solution. These results indicated that the changes of electrolyte solution concentrations led to different adsorption state of anions on the positively charged surface which gave rise to the difference of the friction behaviors. The findings in this study reveal the role of hydrated anions in hydration lubrication and provide deep insights into the origins of hydration lubrication.

Keywords: friction, hydration lubrication, hydration structures, anions, three-dimensional atomic force microscopy (3D-AFM)

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Publication history
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Acknowledgements

Publication history

Received: 07 April 2022
Revised: 09 June 2022
Accepted: 11 June 2022
Published: 30 July 2022
Issue date: January 2023

Copyright

© Tsinghua University Press 2022

Acknowledgements

Acknowledgements

This work was financially supported by the Grant for Taishan Scholar Advantage Characteristic Discipline of Shandong Province, the Start-up Grant for QiLu Young Scholars of Shandong University, the Youth Fund from the Natural Science Foundation of Shandong Province (No. ZR2021QB045), the General Program from China Postdoctoral Science Foundation (No. 2019M662325), and the Grant from Danish Council for Independent Research (No. 9040-00219B), EU H2020RISE 2016-MNR4S Cell project.

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