• Author: Soza, P.

    Pontifícia Universidade Católica

  • Author: Hansen, Flemming Yssing

    Department of Chemistry, Technical University of Denmark, Kemitorvet, 2800, Kgs. Lyngby, Denmark

  • Author: Taub, H.

    University of Missouri

  • Author: Kiwi, M.

    Centro para el Desarrollo de la Nanociencia y la Nanotecnología

  • Author: Cisternas, E.

    Pontifícia Universidade Católica

  • Author: Volkmann, U. G.

    Pontifícia Universidade Católica

  • Author: del Campo, V.

    Pontifícia Universidade Católica

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Molecular-dynamics simulations are used to investigate lateral friction in contact-mode atomic force microscopy of tetracosane (n-C24H50) films. We find larger friction coefficients on the surface of monolayer and bilayer films in which the long axis of the molecules is parallel to the interface than on a surface of molecules with the long axis perpendicular to the surface, in agreement with experimental results. A major dissipation mechanism is the molecular flexibility as manifested in the torsional motion about the molecules' C-C bonds. The generation of gauche defects as a result of this motion does not appear to be in itself a major channel of energy dissipation. As previously reported in the literature, the layer density and thereby the strength of the attractive film-tip interaction is also an important factor in energy dissipation.
Original languageEnglish
JournalEurophysics Letters
Issue number3
Pages (from-to)36001
StatePublished - 2011
CitationsWeb of Science® Times Cited: 2
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ID: 5651911