KAUST DepartmentKAUST Catalysis Center (KCC)
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AbstractWe show that 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 cross linker concentration and low concentrations of the AMUPol biradical. We show that 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 113Cd spectra from CdTe-COOH NPs in minutes. The spectra clearly indicate a highly-disordered cadmium rich surface.
CitationViger-Gravel J, Berruyer P, Gajan D, Basset J-M, Lesage A, et al. (2017) Frozen Acrylamide Gels as Dynamic Nuclear Polarization Matrices. Angewandte Chemie International Edition. Available: http://dx.doi.org/10.1002/anie.201703758.
SponsorsThis work was supported by ERC Advanced Grant No. 320860. We thank Dr. B.J. Walder for help in processing the PASS data, Dr. C. Chamignon for assistance with quantitative liquid-state NMR, and Dr. D. Cala for her insight and advice in gel synthesis.