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@ARTICLE{Schnhals:817896,
      author       = {Schönhals, Andreas and Zorn, Reiner and Frick, Bernhard},
      title        = {{I}nelastic neutron spectroscopy as a tool to investigate
                      nanoconfined polymer systems},
      journal      = {Polymer},
      volume       = {105},
      issn         = {0032-3861},
      address      = {Oxford},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2016-04494},
      pages        = {393–406},
      year         = {2016},
      abstract     = {The effect of a nanometer scale confinement (pore sizes 7.5
                      nm down to 2.5 nm) on the vibrational density of states
                      (VDOS) and on the molecular dynamics of Poly(dimethyl
                      siloxane) (PDMS) and Poly(methyl phenyl siloxane) (PMPS) is
                      studied by inelastic neutron scattering. The high
                      penetration depth of neutrons makes neutron scattering a
                      suitable tool for the study of confined systems. Moreover,
                      neutrons are sensitive to light nuclei therefore the
                      confined polymers can be investigated directly, more or less
                      independently of the confining host. Resulting findings are
                      firstly, a reduction of the low frequency contributions to
                      the VDOS below the Boson Peak frequency for both polymers.
                      Including literature data, this reduction can be regarded as
                      a more general feature for glass-forming systems confined by
                      hard walls. Secondly, clear deviations in the temperature
                      dependence of the mean squared displacement of the confined
                      molecules compared to the bulk were found close to the
                      thermal glass transition temperature, whereas localized
                      methyl group rotations were only weakly influenced.
                      Furthermore, the molecular dynamics is accessed. The
                      combination of neutron Time-of-Flight with neutron
                      backscattering, thus covering a broad dynamical range from
                      sub ps to ns, reveal clear influence from confinement on the
                      intermediate incoherent scattering function S(q,t). The
                      latter was obtained by combining the inverse Fourier
                      transform of the individual dynamical structure factors
                      measured by the both methods. The time and q dependence of
                      S(q,t) are discussed in detail for the local methyl group
                      rotations and the segmental dynamics, considering both the
                      interaction of the segments with the pore walls and possible
                      geometrical confinement effects.},
      cin          = {ICS-1 / Neutronenstreuung ; JCNS-1},
      ddc          = {540},
      cid          = {I:(DE-Juel1)ICS-1-20110106 / I:(DE-Juel1)JCNS-1-20110106},
      pnm          = {551 - Functional Macromolecules and Complexes (POF3-551) /
                      6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623)
                      / 6215 - Soft Matter, Health and Life Sciences (POF3-621)},
      pid          = {G:(DE-HGF)POF3-551 / G:(DE-HGF)POF3-6G4 /
                      G:(DE-HGF)POF3-6215},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000389393200043},
      doi          = {10.1016/j.polymer.2016.06.006},
      url          = {https://juser.fz-juelich.de/record/817896},
}