Thermally activated phenomena observed by atomic force microscopy

Enrico Gnecco, Elisa Riedo, Roland Bennewitz, Ernst Meyer, Harald Brune

Research output: Contribution to journalConference article

Abstract

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 (ν < 10 μm/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.

Original languageEnglish (US)
Pages (from-to)271-274
Number of pages4
JournalMaterials Research Society Symposium - Proceedings
Volume790
StatePublished - Dec 1 2003
EventDynamics in Small Confining Systems - 2003 - Boston, MA, United States
Duration: Dec 1 2003Dec 4 2003

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Atomic force microscopy
atomic force microscopy
friction
Friction
sliding
Nanotips
Stick-slip
wettability
Thermal effects
low speed
temperature effects
Wetting
tendencies
slip
Chemical activation
high speed
activation
Crystalline materials
vibration
Water

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

Cite this

Thermally activated phenomena observed by atomic force microscopy. / Gnecco, Enrico; Riedo, Elisa; Bennewitz, Roland; Meyer, Ernst; Brune, Harald.

In: Materials Research Society Symposium - Proceedings, Vol. 790, 01.12.2003, p. 271-274.

Research output: Contribution to journalConference article

Gnecco, Enrico ; Riedo, Elisa ; Bennewitz, Roland ; Meyer, Ernst ; Brune, Harald. / Thermally activated phenomena observed by atomic force microscopy. In: Materials Research Society Symposium - Proceedings. 2003 ; Vol. 790. pp. 271-274.
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