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1H Detected Relayed Dynamic Nuclear Polarization.

Pierrick Berruyer1, Andrea Bertarello1, Snædís Björgvinsdóttir1

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This summary is machine-generated.

This study enhances nuclear magnetic resonance (NMR) for materials science by combining relayed-dynamic nuclear polarization (R-DNP) with fast magic angle spinning (MAS) for direct proton detection, significantly improving sensitivity and speed.

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Area of Science:

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

Background:

  • Mesoscale structure determination in complex materials using NMR is challenging due to low sensitivity.
  • Previous methods relied on indirect detection of proton (¹H) polarization, limiting experimental efficiency.

Purpose of the Study:

  • To improve sensitivity and reduce experiment times for NMR-based mesoscale structure determination.
  • To enable direct detection of proton hyperpolarization dynamics.

Main Methods:

  • Combination of relayed-dynamic nuclear polarization (R-DNP) with fast magic angle spinning (MAS) at high magnetic field (21.2 T).
  • Utilized 0.7 mm rotors for MAS frequencies up to 60 kHz, enabling direct ¹H detection.
  • Modulated ¹H spin diffusion rates by varying MAS frequency to obtain independent R-DNP curves.

Main Results:

  • Achieved a 16-fold acceleration in experiment times through direct ¹H detection.
  • Successfully determined a Weibull distribution of particle sizes in microcrystalline l-histidine·HCl·H₂O.
  • Established a mean particle radius of 440 ± 20 nm with an order parameter k = 2.2.

Conclusions:

  • The combined R-DNP and fast MAS approach significantly enhances sensitivity and speed for mesoscale structure analysis.
  • Direct proton detection coupled with variable MAS rates provides accurate domain size determination.
  • This technique offers a powerful tool for characterizing complex materials.