Does rotational melting make molecular crystal surfaces more slippery? (Articolo in rivista)

Type
Label
  • Does rotational melting make molecular crystal surfaces more slippery? (Articolo in rivista) (literal)
Anno
  • 2014-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1039/c4nr04641b (literal)
Alternative label
  • Benassi, Andrea; Vanossi, Andrea; Pignedoli, Carlo A.; Passerone, Daniele; Tosatti, Erio (2014)
    Does rotational melting make molecular crystal surfaces more slippery?
    in Nanoscale (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Benassi, Andrea; Vanossi, Andrea; Pignedoli, Carlo A.; Passerone, Daniele; Tosatti, Erio (literal)
Pagina inizio
  • 13163 (literal)
Pagina fine
  • 13168 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 6 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 6 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 21 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Swiss Federal Laboratories for Materials Science & Technology (EMPA); CNR IOM Democritos Natl Simulat Ctr; International School for Advanced Studies; Abdus Salam International Centre for Theoretical Physics (literal)
Titolo
  • Does rotational melting make molecular crystal surfaces more slippery? (literal)
Abstract
  • The surface of a crystal made of roughly spherical molecules exposes, above its bulk rotational phase transition at T = T-r, a carpet of freely rotating molecules, possibly functioning as \" nanobearings\" in sliding friction. We explored by extensive molecular dynamics simulations the frictional and adhesion changes experienced by a sliding C-60 flake on the surface of the prototype system C-60 fullerite. At fixed flake orientation both quantities exhibit only a modest frictional drop of order 20% across the transition. However, adhesion and friction drop by a factor of similar to 2 as the flake breaks its perfect angular alignment with the C-60 surface lattice suggesting an entropy-driven aligned-misaligned switch during pull-off at T-r. The results can be of relevance for sliding Kr islands, where very little frictional differences were observed at T-r, but also to the sliding of C-60-coated tip, where a remarkable factor similar to 2 drop has been reported. (literal)
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