scholarly journals Dynamic nuclear polarization of quadrupolar nuclei using cross polarization from protons: surface-enhanced aluminium-27 NMR

2012 ◽  
Vol 48 (14) ◽  
pp. 1988 ◽  
Author(s):  
Veronika Vitzthum ◽  
Pascal Miéville ◽  
Diego Carnevale ◽  
Marc A. Caporini ◽  
David Gajan ◽  
...  
Keyword(s):  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization ◽  
Quadrupolar Nuclei ◽  
Cross Polarization ◽  
Surface Enhanced

scholarly journals Structure of Colloidal Quantum Dots from Dynamic Nuclear Polarization Surface Enhanced NMR Spectroscopy

2015 ◽  
Vol 137 (43) ◽  
pp. 13964-13971 ◽  
Author(s):  
Laura Piveteau ◽  
Ta-Chung Ong ◽  
Aaron J. Rossini ◽  
Lyndon Emsley ◽  
Christophe Copéret ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Nmr Spectroscopy ◽  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization ◽  
Colloidal Quantum Dots ◽  
Surface Enhanced

Boosting Dissolution Dynamic Nuclear Polarization by Cross Polarization

2012 ◽  
Vol 4 (1) ◽  
pp. 111-114 ◽  
Author(s):  
Aurélien Bornet ◽  
Roberto Melzi ◽  
Angel J. Perez Linde ◽  
Patrick Hautle ◽  
Ben van den Brandt ◽  
...  
Keyword(s):  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization ◽  
Cross Polarization ◽  
Dissolution Dynamic Nuclear Polarization

In Situ XRD and Dynamic Nuclear Polarization Surface Enhanced NMR Spectroscopy Unravel the Deactivation Mechanism of CaO-Based, Ca3Al2O6-Stabilized CO2 Sorbents

2018 ◽  
Vol 30 (4) ◽  
pp. 1344-1352 ◽  
Author(s):  
Sung Min Kim ◽  
Wei-Chih Liao ◽  
Agnieszka M. Kierzkowska ◽  
Tigran Margossian ◽  
Davood Hosseini ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization ◽  
In Situ Xrd ◽  
Surface Enhanced ◽  
Deactivation Mechanism

scholarly journals Hyperpolarized NMR of plant and cancer cell extracts at natural abundance

The Analyst ◽  
2015 ◽  
Vol 140 (17) ◽  
pp. 5860-5863 ◽  
Author(s):  
Jean-Nicolas Dumez ◽  
Jonas Milani ◽  
Basile Vuichoud ◽  
Aurélien Bornet ◽  
Julie Lalande-Martin ◽  
...  
Keyword(s):  
Cancer Cell ◽  
Dynamic Nuclear Polarization ◽  
Nmr Spectra ◽  
Nuclear Polarization ◽  
2D Nmr ◽  
Natural Abundance ◽  
Cross Polarization ◽  
Cell Extracts ◽  
Biological Extracts ◽  
2D Nmr Spectra

Natural abundance 13C 1D and 2D NMR spectra of biological extracts are recorded in a single scan for samples hyperpolarised by dissolution dynamic nuclear polarization combined with cross polarization.

scholarly journals Enhanced Solid-State NMR Correlation Spectroscopy of Quadrupolar Nuclei Using Dynamic Nuclear Polarization

2012 ◽  
Vol 134 (45) ◽  
pp. 18491-18494 ◽  
Author(s):  
Daniel Lee ◽  
Hiroki Takahashi ◽  
Aany S. L. Thankamony ◽  
Jean-Philippe Dacquin ◽  
Michel Bardet ◽  
...  
Keyword(s):  
Solid State ◽  
Dynamic Nuclear Polarization ◽  
Solid State Nmr ◽  
Nuclear Polarization ◽  
Correlation Spectroscopy ◽  
Quadrupolar Nuclei

scholarly journals Revealing the Surface Structure of CdSe Nanocrystals by Dynamic Nuclear Polarization-Enhanced 77Se and 113Cd Solid-State NMR Spectroscopy

2021 ◽  
Author(s):  
Yunhua Chen ◽  
Rick Dorn ◽  
Michael Hanrahan ◽  
Lin Wei ◽  
Rafael Blome-Fernandez ◽  
...  
Keyword(s):  
Solid State ◽  
Dynamic Nuclear Polarization ◽  
Solid State Nmr ◽  
Nuclear Polarization ◽  
Surface Structures ◽  
Cdse Nanocrystals ◽  
Magic Angle ◽  
Cross Polarization ◽  
Zinc Blende ◽  
Detailed Surface

<p>Dynamic nuclear polarization (DNP) solid-state NMR (SSNMR) spectroscopy was used to obtain detailed surface structures of zinc blende CdSe nanocrystals (NCs) with plate or spheroidal morphologies and which are capped by carboxylic acid ligands. 1D <sup>113</sup>Cd and <sup>77</sup>Se cross-polarization magic angle spinning (CPMAS) NMR spectra revealed distinct signals from Cd and Se atoms on the surface of the NCs, and those residing in bulk-like environments below the surface. <sup>113</sup>Cd cross-polarization magic-angle-turning (CP-MAT) experiments identified CdSe<sub>3</sub>O, CdSe<sub>2</sub>O<sub>2</sub>, and CdSeO<sub>3</sub> Cd coordination environments on the surface of the NCs, where the oxygen atoms are presumably from coordinated carboxylate ligands. The sensitivity gain from DNP enabled natural isotopic abundance 2D homonuclear <sup>113</sup>Cd-<sup>113</sup>Cd and <sup>77</sup>Se-<sup>77</sup>Se and heteronuclear <sup>113</sup>Cd-<sup>77</sup>Se scalar correlation solid-state NMR experiments that reveal the connectivity of the Cd and Se atoms. Importantly, <sup>77</sup>Se{<sup>113</sup>Cd} scalar heteronuclear multiple quantum coherence (<i>J</i>-HMQC) experiments were used to selectively measure one-bond <sup>77</sup>Se-<sup>113</sup>Cd scalar coupling constants (<sup>1</sup><i>J</i>(<sup>77</sup>Se, <sup>113</sup>Cd)). With knowledge of <sup>1</sup><i>J</i>(<sup>77</sup>Se, <sup>113</sup>Cd), heteronuclear <sup>77</sup>Se{<sup>113</sup>Cd} spin echo (<i>J</i>-resolved) NMR experiments were then used to determine the number of Cd atoms bonded to Se atoms and vice versa. The <i>J</i>-resolved experiments directly confirmed that major Cd and Se surface species have CdSe<sub>2</sub>O<sub>2</sub> and SeCd<sub>4</sub> stoichiometries, respectively. Considering the crystal structure of zinc blende CdSe, and the similarity of the solid-state NMR data for the platelets and spheroids, we conclude that the surface of the spheroidal CdSe NCs is primarily composed of {100} facets. The methods outlined here will generally be applicable to obtain detailed surface structures of various main group semiconductors.</p>

scholarly journals Boosting Dissolution-Dynamic Nuclear Polarization by Multiple-Step Dipolar Order Mediated 1H->13C Cross-Polarization

2021 ◽  
Author(s):  
Stuart J. Elliott ◽  
Olivier Cala ◽  
Quentin Chappuis ◽  
Samuel Cousin ◽  
Morgan Ceillier ◽  
...  
Keyword(s):  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization ◽  
Pulse Sequence ◽  
Polarization Transfer ◽  
Cross Polarization ◽  
Spin Order ◽  
Sample Dissolution ◽  
Dipolar Order ◽  
Multiple Step ◽  
Dissolution Dynamic Nuclear Polarization

<p>Dissolution-dynamic nuclear polarization can be boosted by employing multiplecontact cross-polarization techniques to transfer polarization from 1H to 13C spins. The method is efficient and significantly reduces polarization build-up times, however, it involves high-power radiofrequency pulses in a superfluid helium environment which limit its implementation and applicability and prevent a significant scaling-up of the sample size.</p> <p>We propose to overcome this limitation by a stepwise transfer of polarization using a lowenergy and low-peak power radiofrequency pulse sequence where the 1H®13C polarization transfer is mediated by a dipolar spin order reservoir. An experimental demonstration is presented for [1-13C]sodium acetate. A solid-state 13C polarization of ~43.5% was achieved using this method with a build-up time constant of ~5.1 minutes, leading to a ~28.5% 13C polarization in the liquidstate after sample dissolution. The low-power multiple-step polarization transfer efficiency with respect to the most advanced and highest-power multiple-contact cross-polarization approach was found to be ~0.69.</p>

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