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@ARTICLE{DeBeer:201118,
      author       = {De Beer, Sissi},
      title        = {{S}witchable {F}riction {U}sing {C}ontacts of
                      {S}timulus-{R}esponsive and {N}onresponding {S}wollen
                      {P}olymer {B}rushes},
      journal      = {Langmuir},
      volume       = {30},
      number       = {27},
      issn         = {1520-5827},
      address      = {Washington, DC},
      publisher    = {ACS Publ.},
      reportid     = {FZJ-2015-03423},
      pages        = {8085 - 8090},
      year         = {2014},
      abstract     = {Stimulus-responsive (SR), solvated polymers can switch
                      between an expanded state and a collapsed state via external
                      stimuli. Using molecular dynamics simulations, I show that
                      such SR polymers can be employed to control the frictional
                      response between two opposing polymer brushes in relative
                      sliding motion. By using a brush composed of SR polymers in
                      contact with a nonresponding solvated polymer brush, the
                      presence of capillaries and the overlap between molecules of
                      the opposing brushes can be switched. When both brushes are
                      solvated, a capillary is formed and polymers of the opposing
                      brushes interdigitate. Interdigitation dominates friction
                      upon shearing flat brush-bearing surfaces, while the
                      breaking and formation of capillaries dominate friction in
                      the low-velocity limit between rough brush-bearing surfaces.
                      Thus, when either rough or flat polymer-bearing surfaces are
                      sheared, friction between two swollen brushes can be high.
                      In contrast, when the SR brush is collapsed, the solvent
                      absorbs only in the brush that does not respond to the
                      external stimulus. The latter circumvents the presence of
                      capillaries and interdigitation of the brushes, which
                      results in a low friction force upon shearing.},
      cin          = {JSC},
      ddc          = {670},
      cid          = {I:(DE-Juel1)JSC-20090406},
      pnm          = {411 - Computational Science and Mathematical Methods
                      (POF2-411)},
      pid          = {G:(DE-HGF)POF2-411},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000339229000019},
      doi          = {10.1021/la5013473},
      url          = {https://juser.fz-juelich.de/record/201118},
}