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Ionic Liquids as Lubricant Additives: A Review.

Yan Zhou¹, Jun Qu¹

¹Materials Science and Technology Division, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37830, United States.

ACS Applied Materials & Interfaces

|December 29, 2016

Summary

Ionic liquids (ILs) enhance lubricant performance as additives, improving energy efficiency and durability. Research correlates IL structure, oil solubility, and properties with lubrication behavior and wear protection mechanisms.

Keywords:

friction ionic liquids lubricant additives oil-solubility tribofilm wear

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Area of Science:

Tribology
Materials Science
Chemistry

Background:

Lubricant advancements are crucial for energy efficiency and durability.
Ionic liquids (ILs), room-temperature molten salts, offer unique physicochemical properties for lubrication.
Recent research focuses on ILs as lubricant additives, leveraging their miscibility in hydrocarbon oils.

Purpose of the Study:

To review recent advances in developing ionic liquids as lubricant additives.
To correlate ionic liquid structure, oil solubility, and properties with lubricating behavior.
To discuss the effects of IL concentration and compatibility on tribological performance and wear protection.

Main Methods:

Literature review of ionic liquid lubricant additive research.
Correlation analysis of ionic liquid structures, physicochemical properties, and oil solubility.
Tribological performance evaluation and tribofilm characterization.

Main Results:

Ionic liquids show significant potential as lubricant additives.
Structure-property relationships influencing oil solubility and lubricating behavior were identified.
Concentration and additive compatibility critically affect tribological performance.
Wear protection mechanisms involve the formation of protective tribofilms.

Conclusions:

Ionic liquids are promising lubricant additives, offering enhanced tribological performance.
Understanding structure-property-performance relationships is key for designing effective IL-based lubricants.
Further research is needed to optimize IL formulations and explore wear protection mechanisms.