Besson, E., et al., Silica materials with wall-embedded nitroxides provide efficient polarization matrices for dynamic nuclear polarization NMR. Chem Commun (Camb), 2016. 52(32): p. 5531-3.
http://www.ncbi.nlm.nih.gov/pubmed/27020483
Hybrid mesoporous silica materials with wall-embedded nitroxides are shown to efficiently polarize impregnated substrates in high-field dynamic nuclear polarization magic-angle spinning solid-state NMR experiments.