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Published on: March 29, 2018
Stability of superlubric sliding on graphite
Astrid S de Wijn1, Claudio Fusco, Annalisa Fasolino
1Institute for Molecules and Materials, Radboud University Nijmegen, Heyendaalseweg 135, 6525AJ Nijmegen, the Netherlands. A.S.deWijn@science.ru.nl
Summary
Superlubric sliding of graphite flakes is unstable under torque-induced rotations. Optimal conditions for superlubricity require large flakes, low temperatures, low loads, and high scanning velocities, unlike typical atomic force microscope experiments.
Area of Science:
- Tribology
- Materials Science
- Nanotechnology
Background:
- Atomic force microscope (AFM) experiments reveal torque-induced rotations disrupt low-friction sliding of incommensurate graphite flakes on graphite.
- Understanding the stability of superlubric sliding is crucial for friction control and nanoscale mechanics.
Purpose of the Study:
- To theoretically investigate the stability of superlubric sliding in graphite flake systems subjected to torque-induced rotations.
- To identify critical parameters and experimental conditions affecting superlubricity.
Main Methods:
- Theoretical investigation of superlubric sliding dynamics.
- Analysis of flake rotation effects on friction and stability.
- Parametric study considering physical parameters and experimental conditions.
Main Results:
- Superlubric motion stability is critically dependent on physical parameters and experimental conditions.
- Scan lines, thermal fluctuations, and high loading forces can destabilize superlubric orbits.
- Optimal conditions for superlubric sliding include large flakes, low temperature, low loads, and high scanning velocities.
Conclusions:
- Superlubric sliding is sensitive to rotational torques and specific experimental factors.
- Achieving stable superlubricity requires careful control over flake size, temperature, load, and scanning velocity.
- Findings provide insights for designing advanced nanoscale friction management strategies.
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