Thermally activated effects in nanofriction

Elisa Riedo, Enrico Gnecco

Research output: Contribution to journalArticle

Abstract

The influence of thermal activation on the motion of a nanotip sliding on a flat surface is discussed. In a dry environment thermal vibrations may induce the tip to jump from an equilibrium position to the next one along its path. This effect leads to a logarithmic increase of friction with the sliding velocity at very low speeds (ν < 10 μm s-1). At higher speeds thermal activation plays a minor role, and the friction versus velocity curve ends with a plateau. A new analytical formula is discussed, which explains both the increase and the stabilization of friction with velocity. In a humid environment, the situation is complicated by water capillaries, which form between tip and surface, if this is rough. These bridges act as an obstacle for thermally activated jumps. Depending on the wettability of the surface, different behaviours are observed.

Original languageEnglish (US)
JournalNanotechnology
Volume15
Issue number4
DOIs
StatePublished - Apr 1 2004

Fingerprint

friction
Friction
sliding
Chemical activation
Nanotips
activation
thermal environments
wettability
low speed
Wetting
flat surfaces
plateaus
Stabilization
stabilization
high speed
vibration
Water
curves
water
Hot Temperature

ASJC Scopus subject areas

  • Engineering (miscellaneous)
  • Materials Science(all)
  • Physics and Astronomy (miscellaneous)

Cite this

Thermally activated effects in nanofriction. / Riedo, Elisa; Gnecco, Enrico.

In: Nanotechnology, Vol. 15, No. 4, 01.04.2004.

Research output: Contribution to journalArticle

Riedo, Elisa ; Gnecco, Enrico. / Thermally activated effects in nanofriction. In: Nanotechnology. 2004 ; Vol. 15, No. 4.
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