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Article Dans Une Revue Journal of Physical Chemistry B Année : 2019

Are Buckminsterfullerenes Molecular Ball Bearings?

Résumé

Buckminsterfullerenes (C 60) are near-spherical molecules which freely rotate at room temperature in the solid state and when dissolved in solution. An intriguing question arises as to whether C 60 molecules can act as molecular ball bearings, i.e. preventing direct contact between two solid surfaces whilst simultaneously dissipating shear stress through fast rotation. To explore this, we performed measurements of friction across a solution of C 60 in the boundary lubrication regime. High resolution shear and normal force measurements between mica sheets separated by the C 60 solution were made using a Surface Force Balance to provide a single-asperity contact and sub-nanometer resolution in lm thickness. We nd that, even at small volume fraction, C 60 forms a solid-like amorphous boundary lm sustaining high normal load, suggesting that this system undergoes a glass transition under connement. The C 60 lm gives rise to a low friction coecient up to moderate applied loads, and we discuss the possible relevance of the ball bearing eect at the molecular scale.
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Dates et versions

hal-03831139 , version 1 (26-10-2022)

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Romain Lhermerout, Christophe Diederichs, Sapna Sinha, Kyriakos Porfyrakis, Susan Perkin. Are Buckminsterfullerenes Molecular Ball Bearings?. Journal of Physical Chemistry B, 2019, 123 (1), pp.310-316. ⟨10.1021/acs.jpcb.8b10472⟩. ⟨hal-03831139⟩

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