Anisotropy Effects in Atomic-Scale Friction



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Gnecco, Enrico and Fajardo, O.Y. and Pina Martínez, Carlos Manuel and Juan J., Mazo (2012) Anisotropy Effects in Atomic-Scale Friction. Tribology letters (Dordrecht. Online), 48 (1). pp. 33-39. ISSN 1573-2711 / (ISSN-L): 1023-8883

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The static and kinetic friction experienced by a point mass elastically driven at different angles on surface lattices with square, hexagonal, and honeycomb symmetries are estimated by analytical and numeric calculations based on the Prandtl–Tomlinson (PT) model. Assuming a strong surface coupling, the anisotropy of static friction increases from 3.7 up to 46.3% when the density of packing of the surface atoms is reduced, but this is not the case for kinetic friction, the anisotropy of which is maximal on a square lattice. Although these results have not been supported by accurate experimental verifications so far, the PT model was successfully applied to interpret anisotropy effects in the friction force profiles measured, among other surfaces, on rectangular lattices with complex unit cells and on stepped crystal surfaces.

Item Type:Article
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"Esta es una versión pre-editada, posterior a la revisión por pares, de un artículo publicado en Tribology letters (Dordrecht. Online). La versión autenticada final está disponible en línea en:

Uncontrolled Keywords:Nanotribology, Friction mechanisms, Stick-slip, Static friction, AFM
Subjects:Sciences > Geology > Crystallography
ID Code:50551
Deposited On:16 Jan 2019 12:10
Last Modified:16 Jan 2019 12:58

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