Frozen Acrylamide Gels as Dynamic Nuclear Polarization Matrices

Jasmine Viger-Gravel (1) , Pierrick Berruyer (2) , David Gajan (2) , Jean-Marie Basset (3) , Anne Lesage (2) , Paul Tordo (4) , Olivier Ouari (4) , Lyndon Emsley (1)

1 ISIC - Institut des sciences et ingénierie chimiques
2 Solid-State NMR Methods for Materials - Méthodes de RMN à l'état solide pour les matériaux
3 KCC - KAUST Catalysis Center
4 ICR - Institut de Chimie Radicalaire

Aqueous acrylamide gels can be used to provide dynamic nuclear polarization (DNP) NMR signal enhancements of around 200 at 9.4 T and 100 K. The enhancements are shown to increase with crosslinker concentration and low concentrations of the AMUPol biradical. This DNP matrix can be used in situations where conventional incipient wetness methods fail, such as to obtain DNP surface enhanced NMR spectra from inorganic nanoparticles. In particular, we obtain Cd-113 spectra from CdTe-COOH NPs in minutes. The spectra clearly indicate a highly disordered cadmium-rich surface.

Mots clés: acrylamide gels; dynamic nuclear polarization; nanoparticles; polyacrylamide gel; quantum dots

Domaines: Chimie analytique; Chimie

Jasmine Viger-Gravel, Pierrick Berruyer, David Gajan, Jean-Marie Basset, Anne Lesage, et al.. Frozen Acrylamide Gels as Dynamic Nuclear Polarization Matrices. Angewandte Chemie International Edition, 2017, 56 (30), pp.8726-8730. ⟨10.1002/anie.201703758⟩. ⟨hal-01569574⟩