10.1016/S0043-1648(99)00040-X

10.1016/S0043-1648(99)00040-X 1 <h5>Introduction</h5> Layered materials such as graphite, MoS 2 and WS 2 (platelets of the 2H polytype) are used both as solid lubricants [1, 2] and as additives in liquid lubricants [3, 4] . Minimum tangential resistance is commonly associated with shearing of the weak inter-layer (typically van der Waals (vdW)) bonds in these materials [5, 6] . Unfortunately, the 2H platelets tend to stick to the mating metal pieces through the reactive dangling bonds on the prismatic edges (0110), which leads to their rapid annihilation through burnishing and oxidation. Recently, the tribological properties of C 60 and C 70 fullerenes were described [7] . It was speculated that the nearly spherical fullerenes may behave as nanoscale ball bearings. Experiments by Campbell et al. [8] with C 60 molecules dissolved in dry toluene tend to substantiate this hypothesis, but comparison of this result with macroscopic friction measurements is not obvious. Further work of this group has demonstrated that, whereas the adhesion energy of smooth C 60 films is very low, the friction coefficient is rather high in this case. The tendency of the fullerene powders to clump and compress into a high shear strength layer was demonstrated to http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png

10.1016/S0043-1648(99)00040-X

Elsevier — Jun 11, 2020

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Elsevier

Abstract

1 <h5>Introduction</h5> Layered materials such as graphite, MoS 2 and WS 2 (platelets of the 2H polytype) are used both as solid lubricants [1, 2] and as additives in liquid lubricants [3, 4] . Minimum tangential resistance is commonly associated with shearing of the weak inter-layer (typically van der Waals (vdW)) bonds in these materials [5, 6] . Unfortunately, the 2H platelets tend to stick to the mating metal pieces through the reactive dangling bonds on the prismatic edges (0110), which leads to their rapid annihilation through burnishing and oxidation. Recently, the tribological properties of C 60 and C 70 fullerenes were described [7] . It was speculated that the nearly spherical fullerenes may behave as nanoscale ball bearings. Experiments by Campbell et al. [8] with C 60 molecules dissolved in dry toluene tend to substantiate this hypothesis, but comparison of this result with macroscopic friction measurements is not obvious. Further work of this group has demonstrated that, whereas the adhesion energy of smooth C 60 films is very low, the friction coefficient is rather high in this case. The tendency of the fullerene powders to clump and compress into a high shear strength layer was demonstrated to

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