Characterization of electron spin exchange interactions in cellulose chars by means of ESR,1H NMR, and Dynamic Nuclear Polarization

1993 ◽  
Vol 5 (2) ◽  
pp. 161-176 ◽  
Author(s):  
R. A. Wind ◽  
L. Li ◽  
G. E. Maciel ◽  
J. B. Wooten
Keyword(s):  
1H Nmr ◽  
Electron Spin ◽  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization ◽  
Spin Exchange ◽  
Exchange Interactions

Solvent-free dynamic nuclear polarization enhancements in organically modified mesoporous silica

2021 ◽  
Author(s):  
Marcos de Oliveira Jr. ◽  
Kevin Herr ◽  
Martin Brodrecht ◽  
Nadia Berenice Haro-Mares ◽  
Till Wissel ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Porous Materials ◽  
Structural Characterization ◽  
Dynamic Nuclear Polarization ◽  
High Field ◽  
Nuclear Polarization ◽  
Organically Modified ◽  
Field Dynamic ◽  
Free Dynamic

High-field Dynamic Nuclear Polarization is a powerful tool for the structural characterization of species on the surface of porous materials or nanoparticles. For these studies the main source of polarization...

SABRE Hyperpolarization of Bipyridine Stabilized Ir-Complex at High, Low and Ultralow Magnetic Fields

2017 ◽  
Vol 231 (3) ◽  
Author(s):  
Andrey N. Pravdivtsev
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Magnetic Fields ◽  
Dynamic Nuclear Polarization ◽  
Signal Amplification ◽  
Nuclear Polarization ◽  
Optical Pumping ◽  
Spin Exchange ◽  
Spin Exchange Optical Pumping ◽  
Wide Range

AbstractA strong limitation of nuclear magnetic resonance is its low inherent sensitivity that can be overcome by using an appropriate hyperpolarization technique. Presently, dynamic nuclear polarization and spin-exchange optical pumping are the only hyperpolarization techniques that are used in applied medicine. However, both are relatively complex in use and expensive. Here we present a modification of the signal amplification by reversible exchange (SABRE) hyperpolarization method – SABRE on stabilized Ir-complexes. A stabilized Ir-complex (here we used bipyridine for stabilization) can be hyperpolarized in a wide range of magnetic fields from a few μT upto 10 T with

scholarly journals Two-Electron-Spin Ratchets as a Platform for Microwave-Free Dynamic Nuclear Polarization of Arbitrary Material Targets

Nano Letters ◽  
2019 ◽  
Vol 19 (4) ◽  
pp. 2389-2396 ◽  
Author(s):  
Pablo R. Zangara ◽  
Jacob Henshaw ◽  
Daniela Pagliero ◽  
Ashok Ajoy ◽  
Jeffrey A. Reimer ◽  
...  
Keyword(s):  
Electron Spin ◽  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization ◽  
Free Dynamic

scholarly journals In Situ Characterization of Pharmaceutical Formulations by Dynamic Nuclear Polarization Enhanced MAS NMR

2017 ◽  
Vol 121 (34) ◽  
pp. 8132-8141 ◽  
Author(s):  
Qing Zhe Ni ◽  
Fengyuan Yang ◽  
Thach V. Can ◽  
Ivan V. Sergeyev ◽  
Suzanne M. D’Addio ◽  
...  
Keyword(s):  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization ◽  
Pharmaceutical Formulations ◽  
Mas Nmr ◽  
In Situ Characterization

Effect of electron spin dynamics on solid-state dynamic nuclear polarization performance

2014 ◽  
Vol 16 (35) ◽  
pp. 18694-18706 ◽  
Author(s):  
Ting Ann Siaw ◽  
Matthias Fehr ◽  
Alicia Lund ◽  
Allegra Latimer ◽  
Shamon A. Walker ◽  
...  
Keyword(s):  
Solid State ◽  
Electron Spin ◽  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization ◽  
Spin Dynamics ◽  
Nitroxide Radicals ◽  
Flip Flop ◽  
State Dynamic ◽  
Spin Flip ◽  
Electron Spin Dynamics

Optimum integral EPR saturation, determined by electron T1e and electron spin flip-flop rate, maximizes solid-state DNP performance using nitroxide radicals.

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