Friction boosted by equilibrium misalignment of incommensurate two-dimensional colloid monolayers
Articolo
Data di Pubblicazione:
2015
Citazione:
Friction boosted by equilibrium misalignment of incommensurate two-dimensional colloid monolayers / D. Mandelli, A. Vanossi, N. Manini, E. Tosatti. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 114(2015 Mar 13), pp. 108302.1-108302.5. [10.1103/PhysRevLett.114.108302]
Abstract:
Colloidal two-dimensional monolayers sliding in an optical lattice are of recent importance as a frictional system. In the general case when the monolayer and optical lattices are incommensurate, we predict two important novelties, one in the static equilibrium structure, the other in the frictional behavior under sliding. Structurally, realistic simulations show that the colloid layer should possess in full equilibrium a small misalignment rotation angle relative to the optical lattice, an effect so far unnoticed but visible in some published experimental moiré patterns. Under sliding, this misalignment has the effect of boosting the colloid monolayer friction by a considerable factor over the hypothetical aligned case discussed so far. A frictional increase of similar origin must generally affect other incommensurate adsorbed monolayers and contacts, to be sought out case by case.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
atomic friction; crystal misalignment; colloid monolayer
Elenco autori:
D. Mandelli, A. Vanossi, N. Manini, E. Tosatti
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