scholarly journals Berichtigung: Scavenging Free Radicals To Preserve Enhancement and Extend Relaxation Times in NMR using Dynamic Nuclear Polarization

2010 ◽  
Vol 122 (43) ◽  
pp. 8004-8004 ◽  
Author(s):  
Pascal Miéville ◽  
Puneet Ahuja ◽  
Riddhiman Sarkar ◽  
Sami Jannin ◽  
Paul R. Vasos ◽  
...  
Keyword(s):  
Free Radicals ◽  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization ◽  
Relaxation Times

scholarly journals Scavenging Free Radicals To Preserve Enhancement and Extend Relaxation Times in NMR using Dynamic Nuclear Polarization

2010 ◽  
Vol 49 (35) ◽  
pp. 6182-6185 ◽  
Author(s):  
Pascal Miéville ◽  
Puneet Ahuja ◽  
Riddhiman Sarkar ◽  
Sami Jannin ◽  
Paul R. Vasos ◽  
...  
Keyword(s):  
Free Radicals ◽  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization ◽  
Relaxation Times

Corrigendum: Scavenging Free Radicals To Preserve Enhancement and Extend Relaxation Times in NMR using Dynamic Nuclear Polarization

2010 ◽  
Vol 49 (43) ◽  
pp. 7834-7834 ◽  
Author(s):  
Pascal Miéville ◽  
Puneet Ahuja ◽  
Riddhiman Sarkar ◽  
Sami Jannin ◽  
Paul R. Vasos ◽  
...  
Keyword(s):  
Free Radicals ◽  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization ◽  
Relaxation Times

scholarly journals Scavenging Free Radicals To Preserve Enhancement and Extend Relaxation Times in NMR using Dynamic Nuclear Polarization

2010 ◽  
Vol 122 (35) ◽  
pp. 6318-6321 ◽  
Author(s):  
Pascal Miéville ◽  
Puneet Ahuja ◽  
Riddhiman Sarkar ◽  
Sami Jannin ◽  
Paul R. Vasos ◽  
...  
Keyword(s):  
Free Radicals ◽  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization ◽  
Relaxation Times

Kernrelaxation und Molekülbewegungen in Lösungen freier Radikale

1966 ◽  
Vol 21 (11) ◽  
pp. 1849-1856
Author(s):  
W. Müller-Warmuth ◽  
V. Printz
Keyword(s):  
Free Radicals ◽  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization ◽  
Relaxation Times ◽  
Translational Diffusion ◽  
Nuclear Relaxation ◽  
Correlation Times ◽  
Temperature Dependences ◽  
Polarization Studies ◽  
Excellent Tool

The frequency- and temperature-dependences of the nuclear relaxation times have been studied in several solutions of free radicals. Whilst the major contribution to the relaxation is in most systems from dipolar nuclear-electron coupling modulated by translational diffusion, rotational tumbling of solvent-radical complexes is more effective in solutions of water. The work confirms former conclusions from dynamic nuclear polarization studies. Moreover the validity of the STOKES-EINSTEIN formula is tested which is an excellent tool for the calculation of correlation times.

Dynamic Nuclear Polarization Studies of TANOL/water-glycerol Solutions

2000 ◽  
Vol 55 (8) ◽  
pp. 682-686 ◽  
Author(s):  
İsmail Sert ◽  
M. Maral Sünnetçioǧlu ◽  
Rıza Sungur ◽  
Gökçe Bingöl
Keyword(s):  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization ◽  
Relaxation Times ◽  
Electronic Relaxation ◽  
Coupling Constant ◽  
Constant Concentration ◽  
Low Field ◽  
Leakage Factor ◽  
Water Glycerol ◽  
Polarization Studies

Abstract Dynamic Nuclear Polarization (DNP) studies of TANOL/water-glycerol solutions were per-formed at 1.53 mT. The samples have either various water-glycerol ratios at constant concentration or various concentrations at a constant water-glycerol ratio. The low field EPR spectra were recorded, the DNP parameters(enhancement factors, coupling constant, leakage factor) were determined, electronic relaxation times were measured. Depending on the values obtained, the interactions between nuclei and electrons are discussed.

Dynamic nuclear polarization of organic compound doped with free radicals

1998 ◽  
Vol 7 (2) ◽  
pp. 106-114
Author(s):  
Yang Bao-lian ◽  
Feng Ji-wen ◽  
Zhou Jian-wei ◽  
Li Li-yun ◽  
Ye Chao-hui ◽  
...  
Keyword(s):  
Free Radicals ◽  
Organic Compound ◽  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization

scholarly journals Porous functionalized polymers enable generating and transporting hyperpolarized mixtures of metabolites

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Théo El Daraï ◽  
Samuel F. Cousin ◽  
Quentin Stern ◽  
Morgan Ceillier ◽  
James Kempf ◽  
...  
Keyword(s):  
Solid State ◽  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization ◽  
Spin Diffusion ◽  
Relaxation Times ◽  
Functionalized Polymers ◽  
Cross Polarization ◽  
Biological Interest ◽  
Remote Preparation ◽  
Bulk Matrix

AbstractHyperpolarization by dissolution dynamic nuclear polarization (dDNP) has enabled promising applications in spectroscopy and imaging, but remains poorly widespread due to experimental complexity. Broad democratization of dDNP could be realized by remote preparation and distribution of hyperpolarized samples from dedicated facilities. Here we show the synthesis of hyperpolarizing polymers (HYPOPs) that can generate radical- and contaminant-free hyperpolarized samples within minutes with lifetimes exceeding hours in the solid state. HYPOPs feature tunable macroporous porosity, with porous volumes up to 80% and concentration of nitroxide radicals grafted in the bulk matrix up to 285 μmol g−1. Analytes can be efficiently impregnated as aqueous/alcoholic solutions and hyperpolarized up to P(13C) = 25% within 8 min, through the combination of 1H spin diffusion and 1H → 13C cross polarization. Solutions of 13C-analytes of biological interest hyperpolarized in HYPOPs display a very long solid-state 13C relaxation times of 5.7 h at 3.8 K, thus prefiguring transportation over long distances.

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