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@ARTICLE{Sivebaek:12966,
      author       = {Sivebaek, I.M. and Samoilov, V.N. and Persson, B. N. J.},
      title        = {{V}elocity {D}ependence of {F}riction of {C}onfined
                      {H}ydrocarbons},
      journal      = {Langmuir},
      volume       = {26},
      issn         = {0743-7463},
      address      = {Washington, DC},
      publisher    = {ACS Publ.},
      reportid     = {PreJuSER-12966},
      pages        = {8721 - 8728},
      year         = {2010},
      note         = {A part of the present work was carried out in frames of the
                      European Science Foundation EUROCORES Programme FANAS
                      supported from the EC Sixth Framework Programme, under
                      Contract N. ERAS-CT-2003-980409. I.M.S. and V.N.S.
                      acknowledge support from IFF, FZ-Julich, as well as
                      hospitality and help of the staff during their research
                      visits.},
      abstract     = {We present molecular dynamics friction calculations for
                      confined hydrocarbon "polymer" solids with molecular lengths
                      from 20 to 1400 carbon atoms. Two cases are considered: (a)
                      polymer sliding against a hard substrate and (b) polymer
                      sliding on polymer. We discuss the velocity dependence of
                      the frictional shear stress for both cases. In our
                      simulations, the polymer films are very thin (approximately
                      3 nm), and the solid walls are connected to a thermostat at
                      a short distance from the polymer slab. Under these
                      circumstances we find that frictional heating effects are
                      not important, and the effective temperature in the polymer
                      film is always close to the thermostat temperature. In the
                      first setup (a), for hydrocarbons with molecular lengths
                      from 60 to 1400 carbon atoms, the shear stresses are nearly
                      independent of molecular length, but for the shortest
                      hydrocarbon C(20)H(42) the frictional shear stress is lower.
                      In all cases the frictional shear stress increases
                      monotonically with the sliding velocity. For polymer sliding
                      on polymer (case b) the friction is much larger, and the
                      velocity dependence is more complex. For hydrocarbons with
                      molecular lengths from 60 to 140 C atoms, the number of
                      monolayers of lubricant increases (abruptly) with increasing
                      sliding velocity (from 6 to 7 layers), leading to a decrease
                      of the friction. Before and after the layering transition,
                      the frictional shear stresses are nearly proportional to the
                      logarithm of sliding velocity. For the longest hydrocarbon
                      (1400 C atoms) the friction shows no dependence on the
                      sliding velocity, and for the shortest hydrocarbon (20 C
                      atoms) the frictional shear stress increases nearly linearly
                      with the sliding velocity.},
      keywords     = {Hydrocarbons: chemistry / Polymers: chemistry /
                      Hydrocarbons (NLM Chemicals) / Polymers (NLM Chemicals) / J
                      (WoSType)},
      cin          = {IFF-1},
      ddc          = {670},
      cid          = {I:(DE-Juel1)VDB781},
      pnm          = {Grundlagen für zukünftige Informationstechnologien},
      pid          = {G:(DE-Juel1)FUEK412},
      shelfmark    = {Chemistry, Multidisciplinary / Chemistry, Physical /
                      Materials Science, Multidisciplinary},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:20210317},
      UT           = {WOS:000277928100141},
      doi          = {10.1021/la904476d},
      url          = {https://juser.fz-juelich.de/record/12966},
}