Title :

Mesoporous Silica Nanoparticles Loaded with Surfactant: Low Temperature Magic Angle Spinning 13C and 29Si NMR Enhanced by Dynamic Nuclear Polarization

Author(s) :

Lafon, Olivier [Auteur]
Unité de Catalyse et de Chimie du Solide (UCCS) - UMR 8181
Thankamony, Aany S. Lilly [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Kobayashi, Takeshi [Auteur]
Ames Laboratory [Ames, USA]
Carnevale, Diego [Auteur]
Institut des Sciences et Ingénierie Chimiques [ISIC]
Vitzthum, Veronika [Auteur]
Institut des Sciences et Ingénierie Chimiques [ISIC]
Slowing, Igor I. [Auteur]
Ames Laboratory [Ames, USA]
Kandel, Kapil [Auteur]
Ames Laboratory [Ames, USA]
Vezin, Herve [Auteur]
Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement (LASIRE) - UMR 8516
Amoureux, Jean-Paul [Auteur]
Unité de Catalyse et de Chimie du Solide (UCCS) - UMR 8181
Bodenhausen, Geoffrey [Auteur]
Institut des Sciences et Ingénierie Chimiques [ISIC]
Pruski, Marek [Auteur]
Ames Laboratory [Ames, USA]

Journal title :

The Journal of Physical Chemistry C

Abbreviated title :

J. Phys. Chem. C

Volume number :

117

Pages :

1375-1382

Publisher :

American Chemical Society (ACS)

Publication date :

2013-01-10

ISSN :

1932-7455

English keyword(s) :

Diffusion
Nanoparticles
Quantum mechanics
Polarization
Surfactants Go to The Journal of Physical Chemistry C The Journal of Physical Chemistry C

HAL domain(s) :

Chimie/Chimie théorique et/ou physique

English abstract : [en]

We show that dynamic nuclear polarization (DNP) can be used to enhance NMR signals of 13C and 29Si nuclei located in mesoporous organic/inorganic hybrid materials, at several hundreds of nanometers from stable radicals ...
Show more >We show that dynamic nuclear polarization (DNP) can be used to enhance NMR signals of 13C and 29Si nuclei located in mesoporous organic/inorganic hybrid materials, at several hundreds of nanometers from stable radicals (TOTAPOL) trapped in the surrounding frozen disordered water. The approach is demonstrated using mesoporous silica nanoparticles (MSN), functionalized with 3-(N-phenylureido)propyl (PUP) groups, filled with the surfactant cetyltrimethylammonium bromide (CTAB). The DNP-enhanced proton magnetization is transported into the mesopores via 1H–1H spin diffusion and transferred to rare spins by cross-polarization, yielding signal enhancements εon/off of around 8. When the CTAB molecules are extracted, so that the radicals can enter the mesopores, the enhancements increase to εon/off ≈ 30 for both nuclei. A quantitative analysis of the signal enhancements in MSN with and without surfactant is based on a one-dimensional proton spin diffusion model. The effect of solvent deuteration is also investigated.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
• Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181

Research team(s) :

Propriétés magnéto structurales des matériaux (PMSM)

Submission date :

2021-06-17T14:29:22Z
2021-10-07T13:08:48Z