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@ARTICLE{Samoilov:42970,
      author       = {Samoilov, V. N. and Persson, B. N. J.},
      title        = {{S}queezing wetting and nonwetting liquids},
      journal      = {The journal of chemical physics},
      volume       = {120},
      issn         = {0021-9606},
      address      = {Melville, NY},
      publisher    = {American Institute of Physics},
      reportid     = {PreJuSER-42970},
      pages        = {1997 - 2004},
      year         = {2004},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {We present molecular-dynamics results for the squeezing of
                      octane (C8H18) between two approaching solid elastic walls
                      with different wetting properties. The interaction energy
                      between the octane bead units and the solid walls is varied
                      from a very small value (1 meV), corresponding to a
                      nonwetting surface with a very large contact angle (nearly
                      180 degrees), to a high value (18.6 meV) corresponding to
                      complete wetting. When at least one of the solid walls is
                      wetted by octane we observe well defined molecular layers
                      develop in the lubricant film when the thickness of the film
                      is of the order of a few atomic diameters. An external
                      squeezing-pressure induces discontinuous, thermally
                      activated changes in the number n of lubricant layers
                      (n-->n-1 layering transitions). With increasing interaction
                      energy between the octane bead units and the solid walls,
                      the transitions from n to n-1 layers occur at higher average
                      pressure. This results from the increasing activation
                      barrier to nucleate the squeeze-out with increasing
                      lubricant-wall binding energy (per unit surface area) in the
                      contact zone. Thus, strongly wetting lubricant fluids are
                      better boundary lubricants than the less wetting ones, and
                      this should result in less wear. We analyze in detail the
                      effect of capillary bridge formation (in the wetting case)
                      and droplets formation (in the nonwetting case) on the
                      forces exerted by the lubricant on the walls. For the latter
                      case small liquid droplets may be trapped at the interface,
                      resulting in a repulsive force between the walls during
                      squeezing, until the solid walls come into direct contact,
                      where the wall-wall interaction may be initially attractive.
                      This effect is made use of in some practical applications,
                      and we give one illustration involving conditioners for hair
                      care application.},
      keywords     = {J (WoSType)},
      cin          = {IFF-TH-I},
      ddc          = {540},
      cid          = {I:(DE-Juel1)VDB30},
      pnm          = {Kondensierte Materie},
      pid          = {G:(DE-Juel1)FUEK242},
      shelfmark    = {Physics, Atomic, Molecular $\&$ Chemical},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:15268334},
      UT           = {WOS:000188389100038},
      doi          = {10.1063/1.1635813},
      url          = {https://juser.fz-juelich.de/record/42970},
}