# EUROISMAR 2019

25-30 August 2019
Henry Ford Building
Europe/Berlin timezone

## Bulk Hyperpolarization of Inorganic Materials

29 Aug 2019, 11:05
25m
Lecture Hall A (Henry Ford Building)

### Lecture Hall A

#### Henry Ford Building

Talk Hyperpolarization techniques

### Speaker

Snaedis Björgvinsdóttir (EPFL)

### Description

We have recently shown how the bulk of proton-free inorganic solids can be hyperpolarized using dynamic nuclear polarization, resulting in sensitivity enhancements in MAS experiments.$^1$ This is achieved by hyperpolarizing nuclei near the particle surface with impregnation DNP and then allowing slow spontaneous spin diffusion between weakly magnetic nuclei to relay the hyperpolarization towards the bulk.
Pulse cooling is a version of this method that uses multiple contact cross-polarization for bulk hyperpolarization. We show how to maximize sensitivity gains in pulse cooling by optimization of the pulse parameters and delays. In addition, we show how to improve sensitivity by modulating the MAS rate during the experiment, which can provide gains of up to a factor 3.5 for the $^{119}$Sn spectra of SnO$_2$, compared to a constant MAS rate.$^2$ We also show how multidimensional experiments can be used to probe the pathway of spin diffusion, particularly for the spectra of compounds with more than one bulk chemical shifts.

1. Bjorgvinsdottir, S.; Walder, B. J.; Pinon, A. C.; Emsley, L., Bulk Nuclear Hyperpolarization of Inorganic Solids by Relay from the Surface. J Am Chem Soc 2018, 140 (25), 7946-7951.
2. Bjorgvinsdottir, S.; Walder, B. J.; Matthey, N.; Emsley, L., Maximizing nuclear hyperpolarization in pulse cooling under MAS. J Magn Reson 2019, 300, 142-148.

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