Quantized friction across ionic liquid thin films

Smith, Alexander M.; Lovelock, Kevin R. J.; Gosvami, Nitya Nand; Welton, Tom; Perkin, Susan

doi:10.1039/c3cp52779d

Cited by 159Lubricants and Their AdditivesForce Microscopy Techniques and ApplicationsTribology and Lubrication Engineering

Quantized friction across ionic liquid thin films

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Smith, Alexander M., Lovelock, Kevin R. J., Gosvami, Nitya Nand, Welton, Tom, Perkin, Susan·2013·Physical Chemistry Chemical Physics

DOI 10.1039/c3cp52779d

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Abstract

Ionic liquids - salts in the liquid state under ambient conditions - are of great interest as precision lubricants. Ionic liquids form layered structures at surfaces, yet it is not clear how this nano-structure relates to their lubrication properties. We measured the friction force between atomically smooth solid surfaces across ionic liquid films of controlled thickness in terms of the number of ion layers. Multiple friction-load regimes emerge, each corresponding to a different number of ion layers in the film. In contrast to molecular liquids, the friction coefficients differ for each layer due to their varying composition.

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Authors: Smith, A. M., Lovelock, K. R. J., Gosvami, N. N., Welton, T., & Perkin, S.
Affiliations: University of Oxford (GB)
Imperial College London (GB)
University of Pennsylvania (US)
Corresponding author: Perkin, Susan
ORCID: Smith, Alexander M.
Lovelock, Kevin R. J.
Gosvami, Nitya Nand
Welton, Tom
Perkin, Susan
Venue: Physical Chemistry Chemical Physics
Publisher: Royal Society of Chemistry (RSC)
Published: 2013
Volume: 15
Issue: 37
Pages: 15317
ISSN: 1463-9076 (ISSN-L)
1463-9084
DOI: 10.1039/c3cp52779d
OpenAlex: W2125621141
Cited by: 159
References: 33
Citations by year: 2026: 7 · 2025: 4 · 2024: 8 · 2023: 12 · 2022: 7 · 2021: 10 · 2020: 12 · 2019: 15 · 2018: 25 · 2017: 16 · 2016: 16 · 2015: 12 · 2014: 12 · 2013: 3
FWCI: 19.02
Type: journal article
Language: en
Open access: hybrid
doi.org
Licence: cc-by
Locations: Physical Chemistry Chemical Physics (publishedVersion, cc-by)
PubMed (publishedVersion)
arXiv (Cornell University) (submittedVersion)
Spiral (Imperial College London) (submittedVersion, other-oa)
arXiv (Cornell University)
Funders: Taiho Kogyo Tribology Research Foundation
Weizmann UK
Leverhulme Trust
Imperial College London
Engineering and Physical Sciences Research Council (EP/J015202/1)
Office of Naval Research (N000141010096, N00014)
Topics: Physical Sciences › Engineering › Mechanical Engineering › Lubricants and Their Additives
Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Force Microscopy Techniques and Applications
Physical Sciences › Engineering › Mechanical Engineering › Tribology and Lubrication Engineering
Keywords: ionic liquids, friction, thin films, lubrication, friction coefficient, friction force, film thickness, atomically flat surfaces

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Quantized friction across ionic liquid thin films

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