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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...

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Multiplying Oxygen Permeability of a Ruddlesden-Popper Oxide by Orientation Control via Magnets.

Zhijun Zhao1, Guoxing Chen2, Giamper Escobar Cano1

  • 1Institute of Physical Chemistry and Electrochemistry, Leibniz University Hannover, Callinstr. 3A, 30167, Hannover, Germany.

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|November 21, 2023
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Summary

By aligning Nd2NiO4+δ grains with a magnetic field, researchers enhanced oxygen permeability in Ruddlesden-Popper oxides. This breakthrough improves membranes for demanding industrial applications like CO2 capture.

Keywords:
Conducting MaterialsMagnetic FieldMixed Ionic Electronic Conducting MembranesOxygen SeparationTexture

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Area of Science:

  • Materials Science
  • Solid-state Chemistry
  • Chemical Engineering

Background:

  • Ruddlesden-Popper (RP) oxides offer superior chemical stability compared to perovskite oxides but suffer from lower oxygen permeability.
  • A key challenge is to enhance oxygen transport properties without compromising the inherent stability of RP materials.

Purpose of the Study:

  • To overcome the trade-off between chemical stability and oxygen permeability in RP oxides.
  • To leverage the anisotropic properties of Neodymium Nickel Oxide (Nd2NiO4+δ) for improved oxygen flux.
  • To demonstrate the potential of magnetically aligned Nd2NiO4+δ membranes for industrial applications.

Main Methods:

  • Utilizing the anisotropic diffusion properties of Nd2NiO4+δ, where the (a,b)-plane exhibits significantly higher oxygen diffusion and surface exchange coefficients than the c-axis.
  • Employing a magnetic field (0.81 T) to align the (a,b)-plane of Nd2NiO4+δ perpendicular to the oxygen partial pressure gradient.
  • Fabricating a textured asymmetric disk membrane (1.0 mm thickness) for oxygen permeation testing.

Main Results:

  • Achieved a stable and high oxygen flux of 1.40 mL min⁻¹ cm⁻² for over 120 hours at 1223 K.
  • Demonstrated excellent operational stability at 1023 K in pure CO2, indicating robustness under harsh conditions.
  • Confirmed significant enhancement in oxygen permeation membrane performance through controlled grain orientation.

Conclusions:

  • Magnetic alignment of Nd2NiO4+δ grains effectively enhances oxygen permeability, overcoming the limitations of traditional RP oxides.
  • Nd2NiO4+δ membranes show great promise for industrial applications requiring high oxygen flux and stability, such as air separation, syngas production, and CO2 capture.
  • Adjusting grain orientation is a critical strategy for optimizing the performance of oxygen permeation membranes in demanding environments.