Ionic Grease Lubricants: Protic [Triethanolamine][Oleic Acid] and Aprotic [Choline][Oleic Acid]
Liwen Mu1, Yijun Shi2, Tuo Ji1
1Intelligent Composites Laboratory, Department of Chemical and Biomolecular Engineering, The University of Akron , Akron, Ohio 44325 United States.
ACS Applied Materials & Interfaces
|January 28, 2016
Summary
Novel ionic greases synthesized from [triethanolamine][oleic acid] and [choline][oleic acid] offer direct lubrication. Aprotic ionic grease demonstrates superior performance under extreme temperatures and pressures, driven by physical adsorption mechanisms.
Area of Science:
- Materials Science
- Tribology
- Lubrication Engineering
Background:
- Ionic liquids are extensively researched as lubricants and additives.
- Ionic greases, however, remain largely unexplored as standalone lubricants.
- The need for high-performance lubricants under demanding conditions is growing.
Purpose of the Study:
- To synthesize and characterize novel protic and aprotic ionic greases.
- To investigate the thermal, rheological, and tribological properties of these ionic greases.
- To elucidate the lubrication mechanism of ionic greases.
Main Methods:
- Synthesis of protic [triethanolamine][oleic acid] and aprotic [choline][oleic acid] ionic greases.
- Thermal and rheological property analysis.
- Tribological testing under varying temperature and pressure conditions.
- Investigation of lubrication mechanisms via surface adsorption analysis.
Main Results:
- Successful synthesis of novel protic and aprotic ionic greases.
- Ionic greases function as effective lubricants without additional thickeners or additives.
- Aprotic ionic grease exhibits enhanced temperature and pressure tolerance compared to protic ionic grease.
- Lubrication is primarily attributed to strong physical adsorption onto friction surfaces, not tribo-chemical film formation.
Conclusions:
- Novel protic and aprotic ionic greases are viable high-performance lubricants.
- Aprotic ionic grease offers superior tribological performance under extreme conditions.
- The lubrication mechanism relies on physical adsorption, highlighting a new pathway for lubricant design.
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