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Information × Registration Number 2110U000800, Article popup.category Стаття Title popup.author popup.publication 01-01-2010 popup.source_user Сумський державний університет popup.source http://essuir.sumdu.edu.ua/handle/123456789/18081 popup.publisher Carbon Description Computer experiments concerning interactions between a graphite surface and the rigid pyramidal nanoasperity of a friction force microscope tip when it is brought close to and retracted from the graphitic sample are presented. Covalent atomic bonds in graphene layers are described using a Brenner potential and tip-carbon forces are derived from the Lennard-Jones potential. For interlayer interactions a registry-dependent potential with local normals is used. The behavior of the system is investigated under conditions of different magnitudes of tip-sample interaction and indentation rates. Strong forces between the nanoasperity and carbon atoms facilitate the cleavage of the graphite surface. Exfoliation, i. e. total removal of the upper graphitic layer, is observed when a highly adhesive tip is moved relative to the surface at low rates, while high rates cause the formation of a small flake attached to the tip. The results obtained may be valuable for enhancing our understanding of the superlubricity of graphite. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/18081 popup.nrat_date 2025-05-12 Close