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    Item type:Publication, Access status: with files ,
    Multiplying oxygen permeability of a Ruddlesden‐Popper oxide by orientation control via magnets
    (Wiley, 2024-02-19)
    Zhijun, Zhao
    ;
    Chen, Guoxing
    ;
    Escobar Cano, Giamper
    ;
    Kißling, Patrick
    ;
    Stölting, Oliver
    Ruddlesden-Popper-type oxides exhibit remarkable chemical stability in comparison to perovskite oxides. However, they display lower oxygen permeability. We present an approach to overcome this trade-off by leveraging the anisotropic properties of Nd₂NiO₄+δ. Its (a,b)-plane, having oxygen diffusion coefficient and surface exchange coefficient several orders of magnitude higher than its c-axis, can be aligned perpendicular to the gradient of oxygen partial pressure by a magnetic field (0.81 T). A stable and high oxygen flux of 1.40 mL min−1 cm−2 was achieved for at least 120 h at 1223 K by a textured asymmetric disk membrane with 1.0 mm thickness under the pure CO₂ sweeping. Its excellent operational stability was also verified even at 1023 K in pure CO₂. These findings highlight the significant enhancement in oxygen permeation membrane performance achievable by adjusting the grain orientation. Consequently, Nd₂NiO₄+δ emerges as a promising candidate for industrial applications in air separation, syngas production, and CO2 capture under harsh conditions.
    Publicationtype: Journal Article
      28  13
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    Item type:Publication, Access status: with files ,
    Multiplying oxygen permeability of a Ruddlesden‐Popper oxide by orientation control via magnets
    (Wiley, 2024-02-19)
    Zhijun, Zhao
    ;
    Chen, Guoxing
    ;
    Escobar Cano, Giamper
    ;
    Kißling, Patrick A.
    ;
    Polarz, Sebastian
    Ruddlesden-Popper-type oxides exhibit remarkable chemical stability in comparison to perovskite oxides. However, they display lower oxygen permeability. We present an approach to overcome this trade-off by leveraging the anisotropic properties of Nd2NiO4+δ. Its (a,b)-plane, having oxygen diffusion coefficient and surface exchange coefficient several orders of magnitude higher than its c-axis, can be aligned perpendicular to the gradient of oxygen partial pressure by a magnetic field (0.81 T). A stable and high oxygen flux of 1.40 mL min−1 cm−2 was achieved for at least 120 h at 1223 K by a textured asymmetric disk membrane with 1.0 mm thickness under the pure CO2 sweeping. Its excellent operational stability was also verified even at 1023 K in pure CO2. These findings highlight the significant enhancement in oxygen permeation membrane performance achievable by adjusting the grain orientation. Consequently, Nd2NiO4+δ emerges as a promising candidate for industrial applications in air separation, syngas production, and CO2 capture under harsh conditions.
    Publicationtype: Journal Article
      98  23
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    Item type:Publication, Access status: without files ,
      43
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      22
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    Development of combined manufacturing technologies for high-strength structural components
    (2010-12)
    Denkena, Berend
    ;
    Breidenstein, Bernd
    ;
    De Leon, Luis
    ;
    Dege, Jan Hendrik
    Novel manufacturing technologies for high-strength structural components of aluminium allow a local modification of material properties to respond to operational demands. Machining and finishing processes for changing material properties like deep rolling or rubbing are to be combined to a single process step. The intention is the controlled adjustment of the component's properties by the modification of its subsurface. For that purpose the essential understanding of the interaction mechanisms of the basic processes turning, deep rolling and rubbing is necessary. Influences of the tool geometry as well as of the process parameters on the material properties are investigated. The results will be extended by parameter studies within numerical simulations. Thereafter, combinations of the basic processes in process sequences are analyzed to their ability to modify the subsurface properties. In consideration of these results, a prototypic combined turn-rolling tool is developed.
    Publicationtype: Conference Paper
      12