Dynamic nuclear polarization of liquid helium-three

1997 ◽  
Vol 12 (4) ◽  
pp. 513-516 ◽  
Author(s):  
B. Bleaney
Keyword(s):  
Liquid Helium ◽  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization ◽  
Helium Three

Dynamic Nuclear Polarization of Liquid Helium-Three by Optical Pumping

1968 ◽  
Vol 170 (1) ◽  
pp. 276-285 ◽  
Author(s):  
H. H. McAdams
Keyword(s):  
Liquid Helium ◽  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization ◽  
Optical Pumping ◽  
Helium Three

scholarly journals A cryogen-free, semi-automated apparatus for bullet-dynamic nuclear polarization with improved resolution

2021 ◽  
Author(s):  
Karel Kouřil ◽  
Michel Gramberg ◽  
Michael Jurkutat ◽  
Hana Kouřilová ◽  
Benno Meier
Keyword(s):  
Liquid Helium ◽  
Dynamic Nuclear Polarization ◽  
Liquid State ◽  
Nmr Spectra ◽  
Nuclear Polarization ◽  
Small Sample ◽  
Signal Loss ◽  
Manual Work ◽  
Dissolution Dynamic Nuclear Polarization

Abstract. In dissolution-dynamic nuclear polarization, a hyperpolarized solid is dissolved with a jet of hot solvent. The solution is then transferred to a secondary magnet, where spectra can be recorded with improved sensitivity. In bullet-dynamic nuclear polarization this order is reversed. Pressurized gas is used to rapidly transfer the hyperpolarized solid to the secondary magnet, and the hyperpolarized solid is dissolved only upon arrival. A potential advantage of this approach is that it may avoid excessive dilution and the associated signal loss, in particular for small sample quantities. Previously, we have shown that liquid-state NMR spectra with polarization levels of up to 30 % may be recorded within less than 1 second after the departure of the hyperpolarized solid from the polarizing magnet. The resolution of the recorded spectra however was limited. The system consumed substantial amounts of liquid helium and substantial manual work was required in between experiments to prepare for the next shot. Here, we present a new bullet-DNP system that addresses these limitations.

scholarly journals A cryogen-free, semi-automated apparatus for bullet-dynamic nuclear polarization with improved resolution

2021 ◽  
Vol 2 (2) ◽  
pp. 815-825
Author(s):  
Karel Kouřil ◽  
Michel Gramberg ◽  
Michael Jurkutat ◽  
Hana Kouřilová ◽  
Benno Meier
Keyword(s):  
Liquid Helium ◽  
Dynamic Nuclear Polarization ◽  
Liquid State ◽  
Nmr Spectra ◽  
Nuclear Polarization ◽  
Small Sample ◽  
Signal Loss ◽  
Manual Work ◽  
Dissolution Dynamic Nuclear Polarization

Abstract. In dissolution-dynamic nuclear polarization, a hyperpolarized solid is dissolved with a jet of hot solvent. The solution is then transferred to a secondary magnet, where spectra can be recorded with improved sensitivity. In bullet-dynamic nuclear polarization this order is reversed. Pressurized gas is used to rapidly transfer the hyperpolarized solid to the secondary magnet, and the hyperpolarized solid is dissolved only upon arrival. A potential advantage of this approach is that it may avoid excessive dilution and the associated signal loss, in particular for small sample quantities. Previously, we have shown that liquid-state NMR spectra with polarization levels of up to 30 % may be recorded within less than 1 s after the departure of the hyperpolarized solid from the polarizing magnet. The resolution of the recorded spectra however was limited. The system consumed significant amounts of liquid helium, and substantial manual work was required in between experiments to prepare for the next shot. Here, we present a new bullet-DNP (dynamic nuclear polarization) system that addresses these limitations.

Porphyrins as Versatile, Aggregation-Tolerant, and Biocompatible Polarizing Agents for Triplet Dynamic Nuclear Polarization of Biomolecules

2021 ◽  
pp. 2645-2650
Author(s):  
Tomoyuki Hamachi ◽  
Koki Nishimura ◽  
Hironori Kouno ◽  
Yusuke Kawashima ◽  
Kenichiro Tateishi ◽  
...  
Keyword(s):  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization

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...

scholarly journals Dynamic Nuclear Polarization of Silicon Carbide Micro- and Nanoparticles

2021 ◽  
Author(s):  
Min Lin ◽  
Vincent Breukels ◽  
Tom W. J. Scheenen ◽  
Jos M. J. Paulusse
Keyword(s):  
Silicon Carbide ◽  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization

scholarly journals Dynamic Nuclear Polarization / solid-state NMR of membranes. Thermal effects and sample geometry

2019 ◽  
Vol 100 ◽  
pp. 70-76 ◽  
Author(s):  
Evgeniy Sergeevich Salnikov ◽  
Fabien Aussenac ◽  
Sebastian Abel ◽  
Armin Purea ◽  
Paul Tordo ◽  
...  
Keyword(s):  
Solid State ◽  
Dynamic Nuclear Polarization ◽  
Thermal Effects ◽  
Solid State Nmr ◽  
Nuclear Polarization ◽  
Sample Geometry
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