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@ARTICLE{Hofmann:22230,
      author       = {Hofmann, T. and Wallacher, D. and Mayorova, M. and Zorn, R.
                      and Frick, B. and Huber, P.},
      title        = {{M}olecular dynamics of n-hexane: {A} quasi-elastic neutron
                      scattering study on the bulk and spatially
                      nanochannel-confined liquid},
      journal      = {Chemical physics},
      volume       = {136},
      issn         = {0301-0104},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {PreJuSER-22230},
      pages        = {124505},
      year         = {2012},
      note         = {This work was supported by the German Research Foundation
                      (DFG) within the priority program 1144, Micro- and
                      Nanofluidics, Grant No. Hu 850/2.},
      abstract     = {We present incoherent quasi-elastic neutron scattering
                      measurements in a wave vector transfer range from 0.4
                      Å(-1) to 1.6Å (-1) on liquid n-hexane confined in
                      cylindrical, parallel-aligned nanochannels of 6 nm mean
                      diameter and 260 μm length in monolithic, mesoporous
                      silicon. They are complemented with, and compared to,
                      measurements on the bulk system in a temperature range from
                      50 K to 250 K. The time-of-flight spectra of the bulk liquid
                      (BL) can be modeled by microscopic translational as well as
                      fast localized rotational, thermally excited, stochastic
                      motions of the molecules. In the nano-confined state of the
                      liquid, which was prepared by vapor condensation, we find
                      two molecular populations with distinct dynamics, a fraction
                      which is immobile on the time scale of 1 ps to 100 ps probed
                      in our experiments and a second component with a
                      self-diffusion dynamics slightly slower than observed for
                      the bulk liquid. No hints of an anisotropy of the
                      translational diffusion with regard to the orientation of
                      the channels' long axes have been found. The immobile
                      fraction amounts to about $5\%$ at 250 K, gradually
                      increases upon cooling and exhibits an abrupt increase at
                      160 K (20 K below bulk crystallization), which indicates
                      pore freezing.},
      keywords     = {J (WoSType)},
      cin          = {ICS-1 / JCNS-1},
      ddc          = {540},
      cid          = {I:(DE-Juel1)ICS-1-20110106 / I:(DE-Juel1)JCNS-1-20110106},
      pnm          = {BioSoft: Makromolekulare Systeme und biologische
                      Informationsverarbeitung (FUEK505) / 544 - In-house Research
                      with PNI (POF2-544)},
      pid          = {G:(DE-Juel1)FUEK505 / G:(DE-HGF)POF2-544},
      shelfmark    = {Physics, Atomic, Molecular $\&$ Chemical},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:22462872},
      UT           = {WOS:000302216200048},
      doi          = {10.1063/1.3696684},
      url          = {https://juser.fz-juelich.de/record/22230},
}