冷冻丙烯酰胺凝胶作为动态核极化基质。
Frozen Acrylamide Gels as Dynamic Nuclear Polarization Matrices.
机构信息
Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015, Lausanne, Switzerland.
Université de Lyon, Institut des Sciences Analytiques (UMR 5280 CNRS/UCBL/ENS Lyon), Centre de RMN à Très Hauts Champs, 69100, Villeurbanne, France.
出版信息
Angew Chem Int Ed Engl. 2017 Jul 17;56(30):8726-8730. doi: 10.1002/anie.201703758. Epub 2017 Jun 19.
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 spectra from CdTe-COOH NPs in minutes. The spectra clearly indicate a highly disordered cadmium-rich surface.
水丙烯酰胺凝胶可用于在 9.4T 和 100K 下提供约 200 的动态核极化（DNP）NMR 信号增强。增强作用被证明随着交联剂浓度和 AMUPol 双自由基的低浓度而增加。这种 DNP 基质可用于常规初始润湿方法失败的情况，例如从无机纳米粒子获得 DNP 表面增强 NMR 光谱。特别是，我们在几分钟内从 CdTe-COOH NPs 获得了 Cd 光谱。这些光谱清楚地表明了富含镉的表面高度无序。
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