2019
DOI: 10.1016/j.ssnmr.2019.03.007
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Improved sensitivity and quantification for 29Si NMR experiments on solids using UDEFT (Uniform Driven Equilibrium Fourier Transform)

Abstract: We demonstrate the possibility to use UDEFT (Uniform Driven Equilibrium Fourier Transform) technique in order to improve the sensitivity and the quantification of one-dimensional 29 Si NMR experiments under Magic-Angle Spinning (MAS). We derive an analytical expression of the signal-tonoise ratios of UDEFT and single-pulse (SP) experiments subsuming the contributions of transient and steady-state regimes. Using numerical spin dynamics simulations and experiments on 29 Si-enriched amorphous silica and borosilic… Show more

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Cited by 11 publications
(5 citation statements)
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References 92 publications
(153 reference statements)
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“…The third approach is to apply pulse sequences based on refocusing effect such as Carr-Purcell-Meiboom-Gill (CPMG) echo-train acquisition [44,45] or Uniform Driven Equilibrium Fourier Transform (UDEFT) sequence with composite pulses [46,47] ). These pulse sequences are used for nuclei with long relaxation times.…”
Section: Approaches For Sensitivity Enhancementmentioning
confidence: 99%
See 1 more Smart Citation
“…The third approach is to apply pulse sequences based on refocusing effect such as Carr-Purcell-Meiboom-Gill (CPMG) echo-train acquisition [44,45] or Uniform Driven Equilibrium Fourier Transform (UDEFT) sequence with composite pulses [46,47] ). These pulse sequences are used for nuclei with long relaxation times.…”
Section: Approaches For Sensitivity Enhancementmentioning
confidence: 99%
“…In theory, the application of these approaches can give a 10-fold increase in sensitivity. [44,47] We have not found any reports on the application of CPMG or UDEFT for in situ NMR studies of zeolite synthesis, but it appears that nothing prevents doing this in the future.…”
Section: Approaches For Sensitivity Enhancementmentioning
confidence: 99%
“…S1. According to the literature, the 27 AlO 4 signal subsumes the resonances of two AlO 4 sites with quadrupolar coupling constants C Q = 1.7 and 4.1 MHz, whereas those of AlO 5 and AlO 6 sites are equal to 5.6 and 2.6 MHz, respectively (Fernandez et al, 1996;Antonijevic et al, 2006). The 1 H-1 H dipolar couplings within the isopropylamine template molecule are larger than in γ -alumina.…”
Section: Alpo 4 -14mentioning
confidence: 99%
“…(Giovine et al, 2019a) We screened here the R  schemes built from single rectangular and composite π-pulses to achieve γ-encoded of quadrupolar nuclei with high-resolution 1 H spectra without using homo-nuclear dipolar decoupling. We tested the following composite π-pulses: 270090180 with ξ tot /(2π) = 2, which is offset-compensated and amplitude modulated and has been employed in several R  sequences, (Giovine et al, 2019a;Carravetta et al, 2000;Levitt, 2002;Pandey et al, 2015) 90024090900 with ξ tot /(2π) = 7/3, which compensates both rf inhomogeneity and offset, (Freeman et al, 1980;Duong et al, 2019) and 90−45904590−45 with ξ tot /(2π) = 3/2, which has homo-nuclear decoupling properties. (Madhu et al, 2001) Adiabatic pulses cannot be employed for SQ hetero-nuclear dipolar recoupling since they yield vanishing scaling factors for the rotational components with μ ≠ 0.…”
Section: Ii-1-2 Selection Of the Recoupling Sequencementioning
confidence: 99%