Title :

Sample Ripening through Nanophase Separation Influences the Performance of Dynamic Nuclear Polarization

Author(s) :

Weber, Emmanuelle M. M. [Auteur]
Laboratoire des biomolécules [LBM UMR 7203]
Sicoli, Giuseppe [Auteur]
Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement (LASIRE) - UMR 8516
Vezin, Herve [Auteur]
Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement (LASIRE) - UMR 8516
Frébourg, Ghislaine [Auteur]
Université Pierre et Marie Curie - Paris 6 [UPMC]
Abergel, Daniel [Auteur]
Laboratoire des biomolécules [LBM UMR 7203]
Bodenhausen, Geoffrey [Auteur]
Laboratoire des biomolécules [LBM UMR 7203]
Kurzbach, Dennis [Auteur]
Laboratoire des biomolécules [LBM UMR 7203]

Journal title :

Angewandte Chemie International Edition

Abbreviated title :

Angew. Chem. Int. Ed.

Volume number :

57

Pages :

5171-5175

Publisher :

Wiley

Publication date :

2018-03-23

ISSN :

1433-7851

HAL domain(s) :

Chimie/Chimie théorique et/ou physique

English abstract : [en]

Mixtures of water and glycerol provide popular matrices for low-temperature spectroscopy of vitrified samples. However, they involve counterintuitive physicochemical properties, such as spontaneous nanoscopic phase separations ...
Show more >Mixtures of water and glycerol provide popular matrices for low-temperature spectroscopy of vitrified samples. However, they involve counterintuitive physicochemical properties, such as spontaneous nanoscopic phase separations (NPS) in solutions that appear macroscopically homogeneous. We demonstrate that such phenomena can substantially influence the efficiency of dynamic nuclear polarization (DNP) by factors up to 20 % by causing fluctuations in local concentrations of polarization agents (radicals). Thus, a spontaneous NPS of water/glycerol mixtures that takes place on time scales on the order of 30–60 min results in a confinement of polarization agents in nanoscopic water-rich vesicles, which in return affects the DNP. Such effects were found for three common polarization agents, TEMPOL, AMUPol and Trityl.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

Administrative institution(s) :

Université de Lille
CNRS

Collections :

• Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement (LASIRE) - UMR 8516

Research team(s) :

Propriétés magnéto structurales des matériaux (PMSM)

Submission date :

2021-06-17T13:19:37Z
2021-09-09T14:41:53Z
2021-09-10T10:42:31Z