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Potential-Dependent Superlubricity of Ionic Liquids on a Graphite Surface
University of Western Australia, Australia.
RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design. KTH Royal Institute of Technology, Sweden.ORCID iD: 0000-0002-8935-8070
Sichuan University, China.
University of Western Australia, Australia.
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2021 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 125, no 7, p. 3940-3947Article in journal (Refereed) Published
Abstract [en]

The lubricities of four quaternary phosphonium ionic liquids-trihexyltetradecylphosphonium bis(2,4,4-trimethylpentyl)phosphinate ([P6,6,6,14][(iC8)2PO2]), trihexyltetradecylphosphonium bis(2-ethylhexyl)phosphate ([P6,6,6,14][BEHP]), trihexyltetradecylphosphonium bis(trifluoromethylsulfonyl)imide ([P6,6,6,14][TFSI]), and tributylmethylphosphonium bis(trifluoromenthylsulfonyl)imide ([P4,4,4,1][TFSI])-were measured as a function of potential on highly oriented pyrolytic graphite (HOPG) by using atomic force microscopy (AFM). The shear strength and surface contact radius values fitted from JKR model indicate the AFM probe slides on an IL boundary layer rather than bare HOPG. Frictions change as the compositions of the boundary layers switch from cation enriched to anion enriched when the potential changes from negative to positive. Superlubricity, which refers to near zero increase in friction with load, is achieved for the [P6,6,6,14]+ cation at-1.0 V and the [TFSI]- anion at +1.0 V. The lubricities of ILs are mainly influenced by three factors: The alkyl chain length, chemical composition, and ion sizes.

Place, publisher, year, edition, pages
American Chemical Society , 2021. Vol. 125, no 7, p. 3940-3947
Keywords [en]
Atomic force microscopy, Friction, Graphite, Ionic liquids, Positive ions, Alkyl chain lengths, Bis(2-ethylhexyl)- Phosphate, Chemical compositions, Graphite surfaces, Highly oriented pyrolytic graphite, Phosphonium ionic liquid, Potential-dependent, Trihexyltetradecylphosphonium, Boundary layers
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:ri:diva-52923DOI: 10.1021/acs.jpcc.0c10804Scopus ID: 2-s2.0-85101494661OAI: oai:DiVA.org:ri-52923DiVA, id: diva2:1542961
Note

Funding details: Australian Institute of Nuclear Science and Engineering, AINSE; Funding details: National Natural Science Foundation of China, NSFC, 21776120; Funding details: Fonds Wetenschappelijk Onderzoek, FWO, G0B3218N; Funding details: Natural Science Foundation of Fujian Province, 2018J01433; Funding details: China Scholarship Council, CSC; Funding text 1: Y.Z. thanks China Scholarship Council and Australian Institute of Nuclear Science and Engineering for the PhD scholarships. J.L. acknowledges funding from the National Natural Science Foundation of China (Project No. 21776120), the Natural Science Foundation of Fujian Province, China (Project No. 2018J01433), and the Research Foundation – Flanders (FWO), Belgium (Project No. G0B3218N).

Available from: 2021-04-09 Created: 2021-04-09 Last updated: 2023-05-25Bibliographically approved

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Rutland, Mark W.

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