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Hyperpolarization transfer pathways in inorganic materials.

Snædís Björgvinsdóttir1, Pinelopi Moutzouri1, Brennan J Walder1

  • 1Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|December 28, 2020
PubMed
Summary
This summary is machine-generated.

Dynamic nuclear polarization enhances sensitivity in magic angle spinning NMR for inorganic materials. This study elucidates magnetization transfer pathways from surface to bulk via spin diffusion.

Keywords:
Dynamic nuclear polarizationSolid-state NMRSpin diffusion

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Area of Science:

  • Solid-state Nuclear Magnetic Resonance (NMR) spectroscopy
  • Materials Science
  • Physical Chemistry

Background:

  • Dynamic nuclear polarization (DNP) can hyperpolarize inorganic materials for enhanced NMR sensitivity.
  • Magnetization transfer from surface to bulk in proton-free inorganic materials is crucial but not well understood.
  • Magic Angle Spinning (MAS) NMR is a key technique for studying these materials.

Purpose of the Study:

  • To elucidate the pathways of magnetization transfer in DNP-enhanced MAS NMR of bulk inorganic materials.
  • To investigate spin diffusion mechanisms from the surface to the bulk.
  • To understand polarization exchange dynamics within the bulk and at surface sites.

Main Methods:

  • Utilized two-dimensional (2D) NMR experiments to probe spin diffusion.
  • Employed dynamic nuclear polarization (DNP) for hyperpolarization.
  • Studied proton-free inorganic materials with incipient wetness impregnation.

Main Results:

  • Demonstrated efficient hyperpolarization relay from surface to multiple bulk sites simultaneously.
  • Observed rapid polarization exchange between bulk sites.
  • Provided evidence for polarization exchange between different surface sites in disordered systems.

Conclusions:

  • Two-dimensional NMR experiments successfully mapped hyperpolarization transfer pathways.
  • DNP-enhanced MAS NMR offers significant sensitivity gains for bulk inorganic compounds.
  • Understanding spin diffusion is key to optimizing DNP applications in materials science.