Tertiary and Quaternary Ammonium-Phosphate Ionic Liquids as Lubricant Additives
Abstract
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.
- Authors:
-
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Shell Global Solutions, Houston, TX (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE)
- OSTI Identifier:
- 1324065
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Tribology Letters
- Additional Journal Information:
- Journal Volume: 63; Journal Issue: 22; Journal ID: ISSN 1023-8883
- Publisher:
- Springer
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Ionic liquid; Ammonium; Lubricant additive; Oil-soluble; Organophosphate
Citation Formats
Barnhill, William C., Luo, Huimin, Meyer, III, Harry M, Ma, Cheng, Chi, Miaofang, Papke, Brian L., and Qu, Jun. Tertiary and Quaternary Ammonium-Phosphate Ionic Liquids as Lubricant Additives. United States: N. p., 2016.
Web. doi:10.1007/s11249-016-0707-6.
Barnhill, William C., Luo, Huimin, Meyer, III, Harry M, Ma, Cheng, Chi, Miaofang, Papke, Brian L., & Qu, Jun. Tertiary and Quaternary Ammonium-Phosphate Ionic Liquids as Lubricant Additives. United States. https://doi.org/10.1007/s11249-016-0707-6
Barnhill, William C., Luo, Huimin, Meyer, III, Harry M, Ma, Cheng, Chi, Miaofang, Papke, Brian L., and Qu, Jun. Thu .
"Tertiary and Quaternary Ammonium-Phosphate Ionic Liquids as Lubricant Additives". United States. https://doi.org/10.1007/s11249-016-0707-6. https://www.osti.gov/servlets/purl/1324065.
@article{osti_1324065,
title = {Tertiary and Quaternary Ammonium-Phosphate Ionic Liquids as Lubricant Additives},
author = {Barnhill, William C. and Luo, Huimin and Meyer, III, Harry M and Ma, Cheng and Chi, Miaofang and Papke, Brian L. and Qu, Jun},
abstractNote = {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.},
doi = {10.1007/s11249-016-0707-6},
journal = {Tribology Letters},
number = 22,
volume = 63,
place = {United States},
year = {Thu Jun 23 00:00:00 EDT 2016},
month = {Thu Jun 23 00:00:00 EDT 2016}
}
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