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Are Buckminsterfullerenes Molecular Ball Bearings?
Romain Lhermerout1, Christophe Diederichs1, Sapna Sinha2
1Department of Chemistry, Physical and Theoretical Chemistry Laboratory , University of Oxford , Oxford OX1 3QZ , U.K.
The Journal of Physical Chemistry. B
|December 12, 2018
Summary
Buckminsterfullerenes (C60) molecules can form solid-like films in solution, acting as molecular ball bearings. These films reduce friction between surfaces, even under high loads, by enabling C60 rotation.
Area of Science:
- Materials Science
- Tribology
- Nanotechnology
Background:
- Buckminsterfullerenes (C60) are spherical molecules known for free rotation in solid and solution states.
- The potential of C60 as molecular ball bearings to reduce friction is an unexplored area.
Purpose of the Study:
- To investigate the friction-reducing capabilities of C60 molecules in solution.
- To determine if C60 can prevent direct surface contact and dissipate shear stress via rotation.
Main Methods:
- Friction measurements in the boundary lubrication regime using a surface force balance.
- High-resolution shear and normal force measurements between mica sheets separated by C60 solution.
- Analysis of film thickness at sub-nanometer resolution and single-asperity contact.
Main Results:
- C60 forms a solid-like amorphous boundary film even at low concentrations.
- This film sustains high normal loads, indicating a glass transition under confinement.
- A low friction coefficient was observed up to moderate applied loads.
Conclusions:
- C60 solutions can form lubricating boundary films.
- The observed low friction suggests a potential molecular ball-bearing effect.
- Further research is needed to fully understand C60's role in tribological applications.
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