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Article
High-Field MAS Dynamic Nuclear Polarization Using Radicals Created by γ-Irradiation
Journal of Physical Chemistry Letters
  • Scott L. Carnahan, Iowa State University and Ames Laboratory
  • Amrit Venkatesh, Iowa State University and Ames Laboratory
  • Frederic A. Perras, Iowa State University and Ames Laboratory
  • James F. Wishart, Brookhaven National Laboratory
  • Aaron J. Rossini, Iowa State University and Ames Laboratory
Document Type
Article
Disciplines
Publication Version
Submitted Manuscript
Publication Date
7-26-2019
DOI
10.1021/acs.jpclett.9b01655
Abstract

High-field magic angle spinning dynamic nuclear polarization (MAS DNP) is often used to enhance the sensitivity of solid-state nuclear magnetic resonance (ssNMR) experiments by transferring spin polarization from electron spins to nuclear spins. Here, we demonstrate that γ-irradiation induces the formation of stable radicals in inorganic solids, such as fused quartz and borosilicate glasses as well as organic solids such as glucose, cellulose, and a urea/polyethylene polymer. The radicals were then used to polarize 29Si or 1H spins in the core of some of these materials. Significant MAS DNP enhancements (ε) greater than 400 and 30 were obtained for fused quartz and glucose, respectively. For other samples negligible ε were obtained likely due to low concentrations of radicals or the presence of abundant quadrupolar spins. These results demonstrate that ionizing radiation is a promising alternative method for generating stable radicals suitable for high-field MAS DNP experiments.

Comments

This is a manuscript of an article published as Carnahan, Scott L., Amrit Venkatesh, Frederic A. Perras, James F. Wishart, and Aaron J. Rossini. "High-Field MAS Dynamic Nuclear Polarization Using Radicals Created by γ-Irradiation." The Journal of Physical Chemistry Letters (2019). DOI: 10.1021/acs.jpclett.9b01655. Posted with permission.

Copyright Owner
American Chemical Society
Language
en
File Format
application/pdf
Citation Information
Scott L. Carnahan, Amrit Venkatesh, Frederic A. Perras, James F. Wishart, et al.. "High-Field MAS Dynamic Nuclear Polarization Using Radicals Created by γ-Irradiation" Journal of Physical Chemistry Letters (2019)
Available at: http://works.bepress.com/aaron-rossini/59/