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@ARTICLE{BellissentFunel:281859,
      author       = {Bellissent-Funel, Marie-Claire and Kaneko, Katsumi and
                      Ohba, Tomonori and Appavou, Marie-Sousai and Soininen, Antti
                      and Wuttke, Joachim},
      title        = {{C}rossover from localized to diffusive water dynamics in
                      carbon nanohorns: {A} comprehensive quasielastic
                      neutron-scattering analysis},
      journal      = {Physical review / E},
      volume       = {93},
      number       = {2},
      issn         = {2470-0045},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {FZJ-2016-01521},
      pages        = {022104},
      year         = {2016},
      abstract     = {Incoherent neutron scattering by water confined in carbon
                      nanohorns was measured with the backscattering spectrometer
                      SPHERES and analyzed in exemplary breadth and depth.
                      Quasielastic spectra admit δ-plus-Kohlrausch fits over a
                      wide q and T range. From the q and T dependence of fitted
                      amplitudes and relaxation times, however, it becomes clear
                      that the fits do not represent a uniform physical process,
                      but that there is a crossover from localized motion at low T
                      to diffusive α relaxation at high T. The crossover
                      temperature of about 210 to 230 K increases with decreasing
                      wave number, which is incompatible with a thermodynamic
                      strong-fragile transition. Extrapolated diffusion
                      coefficients D(T) indicate that water motion is at room
                      temperature about 2.5 times slower than in the bulk; in the
                      supercooled state this factor becomes smaller. At even
                      higher temperatures, where the α spectrum is essentially
                      flat, a few percentages of the total scattering go into a
                      Lorentzian with a width of about 1.6μeV, probably due to
                      functional groups on the surface of the nanohorns.},
      cin          = {JCNS-FRM-II / Neutronenstreuung ; JCNS-1 / JCNS-2},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-1-20110106 / I:(DE-Juel1)JCNS-2-20110106},
      pnm          = {6215 - Soft Matter, Health and Life Sciences (POF3-621) /
                      6G15 - FRM II / MLZ (POF3-6G15) / 6G4 - Jülich Centre for
                      Neutron Research (JCNS) (POF3-623)},
      pid          = {G:(DE-HGF)POF3-6215 / G:(DE-HGF)POF3-6G15 /
                      G:(DE-HGF)POF3-6G4},
      experiment   = {EXP:(DE-MLZ)SPHERES-20140101 / EXP:(DE-MLZ)SCG-20150203},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000369437700004},
      doi          = {10.1103/PhysRevE.93.022104},
      url          = {https://juser.fz-juelich.de/record/281859},
}