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Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes
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Polymer Brush-Enhanced Extraction and Spreading of Oil from Lubricating Greases
Luciana Buonaiuto1, Vincent Siekman1, Sander Reuvekamp1,2
1Physics of Complex Fluids, MESA+ Institute, University of Twente, PO Box 217, 7500AE Enschede, The Netherlands.
Tribology Letters
|April 14, 2026
Summary
Surface treatments significantly enhance lubricant delivery in grease lubrication. Functionalized surfaces, like those with polymer brushes, improve oil release and transport for better friction reduction in tribological contacts.
Area of Science:
- Tribology
- Materials Science
- Surface Engineering
Background:
- Grease lubrication is a fundamental friction reduction strategy.
- Microscopic mechanisms of lubricant release and transport in contacts are poorly understood.
Purpose of the Study:
- Investigate surface treatments for controlling lubricant release and transport.
- Enhance oil delivery from grease reservoirs to tribological contacts.
Main Methods:
- Studied smooth oxide surfaces versus functionalized surfaces (topographic roughening, polymer brushes).
- Quantified oil extraction and spreading capabilities of different surface treatments.
- Investigated polymer brushes with intrinsic phase transitions for adaptive lubrication.
Main Results:
- Smooth surfaces show limited oil extraction and spreading.
- Surface functionalization (roughening, polymer brushes) enhances oil extraction by over two orders of magnitude.
- Phase-transition polymer brushes enable adaptive lubrication, increasing lubricant supply with temperature.
Conclusions:
- Surface topography and chemistry critically control lubricant release and transport.
- Functionalized surfaces offer a pathway to significantly improve grease lubrication efficiency.
- Adaptive lubrication schemes using stimuli-responsive materials show promise for advanced tribological applications.
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