Thermally activated phenomena observed by atomic force microscopy

Gnecco, E. and Riedo, E. and Bennewitz, R. and Meyer, E. and Brune, H.. (2004) Thermally activated phenomena observed by atomic force microscopy. In: Dynamics in small confining systems - 2003, Materials Research Society symposium proceedings ; 790. Warrendale, Pa., pp. 271-274.

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Official URL: http://edoc.unibas.ch/dok/A5262120

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Thermal effects may affect the velocity dependence of friction on the nanoscale in different ways. In a dry environment the stick-slip motion of a nanotip sliding across a crystalline surface is modified by thermal vibrations, which leads to a logarithmic increase of friction with the sliding velocity at very low speeds (nu > 10 mum/s). At higher speeds the role of thermal activation is negligible, and friction becomes velocity-independent. An analytical expression, which explains both regimes of friction vs. velocity, is introduced. In a humid environment the situation is complicated by water capillaries formed between tip and surface, which act as obstacles for thermally activated jumps. Depending on the wettability of the surface, different tendencies in the velocity dependence are observed.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Nanomechanik (Meyer)
UniBasel Contributors:Meyer, Ernst
Item Type:Conference or Workshop Item
Conference or workshop item Subtype:Conference Paper
Publisher:Materials Research Society
Note:Publication type according to Uni Basel Research Database: Conference paper
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Last Modified:22 Mar 2012 14:27
Deposited On:22 Mar 2012 13:56

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