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@ARTICLE{TchouaNgamou:255838,
      author       = {Tchoua Ngamou, Patrick and Ivanova, Mariya and Herwartz,
                      Cleopatra and Lühmann, Nicole and Besmehn, Astrid and
                      Meulenberg, Wilhelm Albert and Mayer, Joachim and Guillon,
                      Olivier},
      title        = {{T}ailoring the structure and gas permeation properties of
                      silica membranes via binary metal oxides doping},
      journal      = {RSC Advances},
      volume       = {5},
      number       = {101},
      issn         = {2046-2069},
      address      = {London},
      publisher    = {RSC Publishing},
      reportid     = {FZJ-2015-05949},
      pages        = {82717-82725},
      year         = {2015},
      abstract     = {The sol–gel method was employed for the synthesis of
                      binary X–Co (X: Mn, Cr) oxide-doped silicamembranes with
                      different X/Co molar ratios (X/Co: 0.1, 0.3, 0.9).
                      Single-gas permeation tests wereperformed at 200 C to
                      determine the effect of the binary oxide composition on the
                      amorphous silicanetwork. The X-ray diffraction (XRD), X-ray
                      Photoelectron Spectroscopy (XPS) and Transmission
                      ElectronMicroscopy (TEM) indicated the presence of smaller
                      MnxCo3xO4 and CrxCo3xO4 oxide nanocrystals inthe silica
                      matrix in addition to amorphous Co, Mn and Cr species. The
                      H2/N2 permeance ratio decreasedfrom (126.3 9) to (10.7 2)
                      with an increase in X/Co molar ratio from 0.1 to 0.9 due to
                      the formationof larger pores. However, the binary Co–X
                      oxide-doped silica membrane with the lowest X contentshowed
                      a H2/N2 permeance ratio, (126.3 9), higher than that, (63.6
                      6), of the single cobalt oxidesilica membrane. Based on FTIR
                      analysis, it was found that the densification of the
                      membrane at low Xcontent resulted from the formation of
                      silica structures with narrowed siloxane rings. In contrast,
                      theenlargement of siloxane rings due to favorable
                      condensation reactions occurred at high X content.},
      cin          = {IEK-1 / ZEA-3 / JARA-ENERGY},
      ddc          = {540},
      cid          = {I:(DE-Juel1)IEK-1-20101013 / I:(DE-Juel1)ZEA-3-20090406 /
                      $I:(DE-82)080011_20140620$},
      pnm          = {113 - Methods and Concepts for Material Development
                      (POF3-113)},
      pid          = {G:(DE-HGF)POF3-113},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000362438300011},
      doi          = {10.1039/C5RA15783H},
      url          = {https://juser.fz-juelich.de/record/255838},
}