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@PHDTHESIS{Moon:20618,
      author       = {Moon, Hyo Jeong},
      title        = {{D}evelopment of thin film inorganic membranes},
      volume       = {136},
      school       = {Ruhr-Universität Bochum},
      type         = {Dr. (Univ.)},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {PreJuSER-20618},
      isbn         = {978-3-89336-781-8},
      series       = {Schriften des Forschungszentrums Jülich : Energie $\&$
                      Umwelt / Energy $\&$ Environment},
      pages        = {II, XII, 118 S.},
      year         = {2012},
      note         = {Record converted from JUWEL: 18.07.2013; Ruhr-Universität
                      Bochum, Diss., 2012},
      abstract     = {Membrane-based gas separation systems are noteworthy among
                      technological options for carbon capture and storage (CCS),
                      which is an important strategy to reduce CO$_{2}$ emitted
                      from point sources, e.g. mainly fossil power plants. In
                      Oxyfuel-Combustion and Pre-Combustion of CCS power plant
                      concepts oxygen separation from air is required. To meet
                      this requirement oxygen transport membranes (OTM) consisting
                      of gastight mixed ionic electronic conductors (MIEC) are
                      proposed, which are associated with significantly lower
                      efficiency losses compared with conventional air separation
                      technologies. For cost effective application a maximum
                      oxygen flux has to be achieved to reduce the membrane area.
                      This can be met by reduction of membrane thickness.
                      Therefore, the reduction of the membrane thickness to the
                      micrometer range or even below is aimed in the present
                      thesis. Ce$_{0.8}$Gd$_{0.2}$O$_{2-\delta}$ (CGO) with
                      fluorite crystal structure and
                      La$_{0.58}$Sr$_{0.4}$Co$_{0.2}$Fe$_{0.8}$O$_{3-\delta}$-(LSCF)
                      with perovskite crystal structure were developed as thin
                      film membrane. CGO is expected to be more stable than other
                      potential MIEC membranes in reducing atmospheres and to
                      achieve sufficient oxygen permeation, e.g. in syngas
                      production or petrol chemistry. LSCF is expected to be
                      highly permeable with an acceptable chemical stability in
                      Oxyfuel-combustion. Various porous ceramic substrates were
                      prepared by vacuum-slip-casting and warm-pressing, and then
                      characterized for porosity, gas-permeability and surface
                      roughness. Subsequently, two approaches to fabrication of
                      thin film membranes were investigated, which are wetchemical
                      deposition (WCD) and physical vapor deposition (PVD). For
                      WCD, nano-dispersions and colloidal sols were prepared for
                      membrane top-layer and/or interlayer. When CGO
                      nano-dispersion (NDCGO) was spin-coated as thin film
                      membrane, the gastightness of sintered membranes was
                      increased with decrease in spinning time and increase in
                      concentration of NDCGO. With decrease in cooling rate for
                      sintering process and high molecular weight binder for
                      higher concentration of NDCGO, crack-free layers were
                      achieved. He leak rates of sintered and reduced membranes
                      reached the range of 10$^{-4}$ and 10$^{-3}$
                      mbar$\cdot$1$\cdot$sec$^{-1} \cdot$cm$^{-2}$, respectively.
                      For PVD, CGO membranes were deposited by reactive magnetron
                      sputtering. According to the substrate properties and
                      applied bias power, different deposition behavior was
                      observed. Particularly for 8YSZ (8 mol\% Y$_{2}$O$_{3}$
                      stabilized ZrO$_{2}$) substrate, four-zone-model of membrane
                      was derived related to substrate strength and bias power.
                      Without bias assist only porous films were deposited.
                      Applying bias power enabled compact membrane but caused
                      delamination at the same time. Adopting higher presintering
                      temperature of substrate improved substrate strength and
                      thus realized delamination-free compact membranes. LSCF
                      membranes were deposited by magnetron sputtering without
                      bias assist. LSCF membranes were porous on 8YSZ substrates,
                      but gastight on CGO interlayers. Concentration of CGO
                      nano-dispersion and presintering temperature of CGO
                      interlayers rarely influenced the gastightness of deposited
                      LSCF membrane. He leak rates of CGO and LSCF membranes
                      reached the range of 10$^{-4}$ and 10$^{-3}$
                      mbar$\cdot$1$\cdot$sec$^{-1} \cdot$cm$^{-2}$, respectively.},
      cin          = {IEK-1},
      ddc          = {500},
      cid          = {I:(DE-Juel1)IEK-1-20101013},
      pnm          = {Rationelle Energieumwandlung},
      pid          = {G:(DE-Juel1)FUEK402},
      typ          = {PUB:(DE-HGF)11 / PUB:(DE-HGF)3},
      url          = {https://juser.fz-juelich.de/record/20618},
}