Dynamic Nuclear Polarization Efficiency Increased by Very Fast Magic Angle Spinning

Abstract : Dynamic Nuclear Polarization has recently emerged as a tool to enhance the sensitivity of solid-state NMR experiments. However, so far high enhancements (>100) are limited to relatively low magnetic fields, and DNP at fields higher than 9.4 T significantly drops in efficiency. Here we report solid-state Overhauser effect DNP enhancements of over 100 at 18.8 T. This is achieved through the unexpected discovery that enhancements increase rapidly with increasing magic angle spinning rates. The measurements are made using 1,3-bisdiphenylene-2-phenylallyl (BDPA) dissolved in ortho-terphenyl (OTP) at 40 kHz MAS. We introduce a source-sink diffusion model for polarization transfer which is capable of explaining the experimental observations. The advantage of this approach is demonstrated on mesoporous alumina with the acquisition of well-resolved DNP surface enhanced 27Al CP spectra.
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Journal of the American Chemical Society, American Chemical Society, 2017, 139 (31), pp.10609-10612. 〈10.1021/jacs.7b05194〉
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Sachin R. Chaudhari, Dorothea Wisser, Arthur C. Pinon, Pierrick Berruyer, David Gajan, et al.. Dynamic Nuclear Polarization Efficiency Increased by Very Fast Magic Angle Spinning. Journal of the American Chemical Society, American Chemical Society, 2017, 139 (31), pp.10609-10612. 〈10.1021/jacs.7b05194〉. 〈hal-01576023〉

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