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The Effect of Disorder on Endogenous MAS-DNP: Study of Silicate Glasses and Crystals by Brijith Thomas; Daniel Jardón-Álvarez; Raanan Carmieli; Johan van Tol; Michal Leskes is a Materials Science article available to read on EtoBox.

What is The Effect of Disorder on Endogenous MAS-DNP: Study of Silicate Glasses and Crystals about?

In dynamic nuclear polarization nuclear magnetic resonance (DNP-NMR) experiments, the large Boltzmann polarization of unpaired electrons is transferred to surrounding nuclei, leading to a significant increase in the sensitivity of the NMR signal. In order to obtain large polarization gains in the bulk of inorganic samples, paramagnetic metal ions are introduced as minor dopants acting as polarizing agents. While this approach has been shown to be very efficient in crystalline inorganic oxides, significantly lower enhancements have been reported when applying this approach to oxide glasses. In order to rationalize the origin of the difference in the efficiency of DNP in amorphous and crystalline inorganic matrices, we performed a detailed comparison in terms of their magnetic resonance properties. To diminish differences in the DNP performance arising from distinct nuclear interactions, glass and crystal systems of similar compositions were chosen, Li~2~OCaO·2SiO~2~ and Li~2~CaSiO~4~, respectively. Using Gd(III) as polarizing agent, DNP provided signal enhancements in the range of 100 for the crystalline sample, while only up to around factor 5 in the glass, for both ^6^Li and ^29^S

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Author

Brijith Thomas; Daniel Jardón-Álvarez; Raanan Carmieli; Johan van Tol; Michal Leskes

Publisher

American Chemical Society (ACS)

Published

2023

Language

EN

Field

Materials Science (Physical Sciences)