Tribochemistry of imidazolium and phosphonium bis(oxalato)borate ionic liquids: Understanding the differences

Patrick Rohlmann; Jeffrey J. Black; Seiya Watanabe; Johan Leckner; Manishkumar R. Shimpi; Mark W. Rutland; Jason B. Harper; Sergei Glavatskih

doi:10.1016/j.triboint.2023.108263

Tribochemistry of imidazolium and phosphonium bis(oxalato)borate ionic liquids: Understanding the differences

Patrick Rohlmann, Jeffrey J. Black, Seiya Watanabe, Johan Leckner, Manishkumar R. Shimpi, Mark W. Rutland, Jason B. Harper, Sergei Glavatskih

Research output: Contribution to journal › Article › peer-review

21 Citations (Scopus)

Abstract

Lubrication properties of imidazolium and phosphonium bis(oxalato)borate ionic liquids (ILs) are compared in a reciprocating sliding contact at 80 Â°C and 140 Â°C. Both the influence of the alkyl chain length and the cation architecture on friction, wear and lubricant breakdown are investigated. Imidazolium ILs showed lower friction than phosphonium ILs though only phosphonium-based ILs reduced wear. A longer alkyl chain reduced friction only in the case of the imidazolium-based ILs. Analysis of the wear scars was consistent with chemical breakdown solely of the anion. Chemical changes in the ILs after the tribotests were more pronounced for imidazolium-based ILs, and comparison of breakdown and tribofilm formation implicated catalysis by the imidazolium center, which, in turn, had a strong dependence on the surface self-assembly.

Original language	English
Article number	108263
Journal	Tribology International
Volume	181
DOIs	https://doi.org/10.1016/j.triboint.2023.108263
Publication status	Published - Mar 2023
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2023 The Authors

Keywords

Decomposition
Friction
Ionic liquid
ToF-SIMS
Tribofilm
Wear

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10.1016/j.triboint.2023.108263

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title = "Tribochemistry of imidazolium and phosphonium bis(oxalato)borate ionic liquids: Understanding the differences",

abstract = "Lubrication properties of imidazolium and phosphonium bis(oxalato)borate ionic liquids (ILs) are compared in a reciprocating sliding contact at 80 {\^A}°C and 140 {\^A}°C. Both the influence of the alkyl chain length and the cation architecture on friction, wear and lubricant breakdown are investigated. Imidazolium ILs showed lower friction than phosphonium ILs though only phosphonium-based ILs reduced wear. A longer alkyl chain reduced friction only in the case of the imidazolium-based ILs. Analysis of the wear scars was consistent with chemical breakdown solely of the anion. Chemical changes in the ILs after the tribotests were more pronounced for imidazolium-based ILs, and comparison of breakdown and tribofilm formation implicated catalysis by the imidazolium center, which, in turn, had a strong dependence on the surface self-assembly.",

keywords = "Decomposition, Friction, Ionic liquid, ToF-SIMS, Tribofilm, Wear",

author = "Patrick Rohlmann and Black, {Jeffrey J.} and Seiya Watanabe and Johan Leckner and Shimpi, {Manishkumar R.} and Rutland, {Mark W.} and Harper, {Jason B.} and Sergei Glavatskih",

note = "Publisher Copyright: {\textcopyright} 2023 The Authors",

year = "2023",

month = mar,

doi = "10.1016/j.triboint.2023.108263",

language = "English",

volume = "181",

journal = "Tribology International",

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T1 - Tribochemistry of imidazolium and phosphonium bis(oxalato)borate ionic liquids

T2 - Understanding the differences

AU - Rohlmann, Patrick

AU - Black, Jeffrey J.

AU - Watanabe, Seiya

AU - Leckner, Johan

AU - Shimpi, Manishkumar R.

AU - Rutland, Mark W.

AU - Harper, Jason B.

AU - Glavatskih, Sergei

PY - 2023/3

Y1 - 2023/3

N2 - Lubrication properties of imidazolium and phosphonium bis(oxalato)borate ionic liquids (ILs) are compared in a reciprocating sliding contact at 80 Â°C and 140 Â°C. Both the influence of the alkyl chain length and the cation architecture on friction, wear and lubricant breakdown are investigated. Imidazolium ILs showed lower friction than phosphonium ILs though only phosphonium-based ILs reduced wear. A longer alkyl chain reduced friction only in the case of the imidazolium-based ILs. Analysis of the wear scars was consistent with chemical breakdown solely of the anion. Chemical changes in the ILs after the tribotests were more pronounced for imidazolium-based ILs, and comparison of breakdown and tribofilm formation implicated catalysis by the imidazolium center, which, in turn, had a strong dependence on the surface self-assembly.

AB - Lubrication properties of imidazolium and phosphonium bis(oxalato)borate ionic liquids (ILs) are compared in a reciprocating sliding contact at 80 Â°C and 140 Â°C. Both the influence of the alkyl chain length and the cation architecture on friction, wear and lubricant breakdown are investigated. Imidazolium ILs showed lower friction than phosphonium ILs though only phosphonium-based ILs reduced wear. A longer alkyl chain reduced friction only in the case of the imidazolium-based ILs. Analysis of the wear scars was consistent with chemical breakdown solely of the anion. Chemical changes in the ILs after the tribotests were more pronounced for imidazolium-based ILs, and comparison of breakdown and tribofilm formation implicated catalysis by the imidazolium center, which, in turn, had a strong dependence on the surface self-assembly.

KW - Decomposition

KW - Friction

KW - Ionic liquid

KW - ToF-SIMS

KW - Tribofilm

KW - Wear

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U2 - 10.1016/j.triboint.2023.108263

DO - 10.1016/j.triboint.2023.108263

M3 - Article

AN - SCOPUS:85147357958

SN - 0301-679X

VL - 181

JO - Tribology International

JF - Tribology International

M1 - 108263

ER -

Tribochemistry of imidazolium and phosphonium bis(oxalato)borate ionic liquids: Understanding the differences

Abstract

Bibliographical note

Keywords

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