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Sliding friction and superlubricity of colloidal AFM probes coated by tribo-induced graphitic transfer layers by Buzio, Renato; Gerbi, Andrea; Bernini, Cristina; Repetto, Luca; Vanossi, Andrea is a scholarly article available to read on EtoBox.

What is Sliding friction and superlubricity of colloidal AFM probes coated by tribo-induced graphitic transfer layers about?

Colloidal probe Atomic Force Microscopy (AFM) allows to explore sliding friction phenomena in graphite contacts of nominal lateral size up to hundreds of nanometers. It is known that contact formation involves tribo-induced material transfer of graphite flakes from the graphitic substrate to the colloidal probe. In this context, sliding states with nearly-vanishing friction, i.e. superlubricity, may set in. A comprehensive investigation of the transfer layer properties is mandatory to ascertain the origin of superlubricity. Here we explore the friction response of micrometric beads, of different size and pristine surface roughness, sliding on graphite under ambient conditions. We show that such tribosystems undergo a robust transition towards a low-adhesion, low-friction state dominated by mechanical interactions at one dominant tribo-induced nanocontact. Friction force spectroscopy reveals that the nanocontact can be superlubric or dissipative, in fact undergoing a load-driven transition from dissipative stick-slip to continuous superlubric sliding. This behavior is excellently described by the thermally-activated, single-asperity Prandtl-Tomlinson model. Our results indicate that

Author

Buzio, Renato; Gerbi, Andrea; Bernini, Cristina; Repetto, Luca; Vanossi, Andrea

Published

2022

Language

EN