Tertiary and Quaternary Ammonium-Phosphate Ionic Liquids as Lubricant Additives

Barnhill, William C.; Luo, Huimin; Meyer, III, Harry M; Ma, Cheng; Chi, Miaofang; Papke, Brian L.; Qu, Jun

doi:10.1007/s11249-016-0707-6

Title: Tertiary and Quaternary Ammonium-Phosphate Ionic Liquids as Lubricant Additives

Journal Article · Thu Jun 23 00:00:00 EDT 2016 · Tribology Letters

DOI:https://doi.org/10.1007/s11249-016-0707-6· OSTI ID:1324065

Barnhill, William C. ^[1]; Luo, Huimin ^[1]; Meyer, III, Harry M ^[1]; Ma, Cheng ^[1]; Chi, Miaofang ^[1]; Papke, Brian L. ^[2]; Qu, Jun ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Shell Global Solutions, Houston, TX (United States)

In this work we investigated the feasibility of five quaternary (aprotic) and four tertiary (protic) ammonium ionic liquids (ILs) with an identical organophosphate anion as lubricant antiwear additives. Viscosity, oil solubility, thermal stability, and corrosivity of the candidate ILs were characterized and correlated to the molecular structure. The protic group exhibits higher oil solubility than the aprotic group, and longer alkyl chains seem to provide better oil solubility and higher thermal stability. Selected ILs were applied as oil additives in steel-cast iron tribological tests and demonstrated promising anti-scuffing and anti-wear functionality. The thickness, nanostructure, coverage and composition of the tribofilm formed by the besting performing IL were revealed by surface characterization for mechanistic understanding of the tribochemical interactions between the IL and metal surface. Results provide fundamental insights of the correlations among the molecular structure, physiochemical properties and lubricating performance for ammonium-phosphate ILs.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1324065

Journal Information:: Tribology Letters, Vol. 63, Issue 22; ISSN 1023-8883

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 58 works

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Ionic liquid
Ammonium
Lubricant additive
Oil-soluble
Organophosphate

Title: Tertiary and Quaternary Ammonium-Phosphate Ionic Liquids as Lubricant Additives

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