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@ARTICLE{vanderLoop:172160,
      author       = {van der Loop, Tibert H. and Ottosson, Niklas and Lotze,
                      Stefan and Kentzinger, Emmanuel and Vad, Thomas and Sager,
                      Wiebke and Bakker, Huib J. and Woutersen, Sander},
      title        = {{S}tructure and dynamics of water in nanoscopic spheres and
                      tubes},
      journal      = {The journal of chemical physics},
      volume       = {141},
      issn         = {0021-9606},
      address      = {Melville, NY},
      publisher    = {American Institute of Physics},
      reportid     = {FZJ-2014-05670},
      pages        = {18C535},
      year         = {2014},
      abstract     = {We study the reorientation dynamics of liquid water
                      confined in nanometer-sized reverse micelles of spherical
                      and cylindrical shape. The size and shape of the micelles
                      are characterized in detail using small-angle x-ray
                      scattering, and the reorientation dynamics of the water
                      within the micelles is investigated using GHz dielectric
                      relaxation spectroscopy and polarization-resolved infrared
                      pump-probe spectroscopy on the OD-stretch mode of dilute
                      HDO:H2O mixtures. We find that the GHz dielectric response
                      of both the spherical and cylindrical reverse micelles can
                      be well described as a sum of contributions from the
                      surfactant, the water at the inner surface of the reversed
                      micelles, and the water in the core of the micelles. The
                      Debye relaxation time of the core water increases from the
                      bulk value τH2O of 8.2 ± 0.1 ps for the largest reverse
                      micelles with a radius of 3.2 nm to 16.0 ± 0.4 ps for the
                      smallest micelles with a radius of 0.7 nm. For the
                      nano-spheres the dielectric response of the water is
                      approximately ∼6 times smaller than expected from the
                      water volume fraction and the bulk dielectric relaxation of
                      water. We find that the dielectric response of nano-spheres
                      is more attenuated than that of nano-tubes of identical
                      composition (water-surfactant ratio), whereas the
                      reorientation dynamics of the water hydroxyl groups is
                      identical for the two geometries. We attribute the
                      attenuation of the dielectric response compared to bulk
                      water to a local anti-parallel ordering of the molecular
                      dipole moments. The difference in attenuation between
                      nano-spheres and nano-cylinders indicates that the
                      anti-parallel ordering of the water dipoles is more
                      pronounced upon spherical than upon cylindrical
                      nanoconfinement},
      cin          = {PGI-5 / JARA-FIT / PGI-4 / JCNS-2},
      ddc          = {540},
      cid          = {I:(DE-Juel1)PGI-5-20110106 / $I:(DE-82)080009_20140620$ /
                      I:(DE-Juel1)PGI-4-20110106 / I:(DE-Juel1)JCNS-2-20110106},
      pnm          = {424 - Exploratory materials and phenomena (POF2-424) / 422
                      - Spin-based and quantum information (POF2-422) / 542 -
                      Neutrons (POF2-542) / 544 - In-house Research with PNI
                      (POF2-544)},
      pid          = {G:(DE-HGF)POF2-424 / G:(DE-HGF)POF2-422 /
                      G:(DE-HGF)POF2-542 / G:(DE-HGF)POF2-544},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000344847600079},
      doi          = {10.1063/1.4898380},
      url          = {https://juser.fz-juelich.de/record/172160},
}