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Simultaneous acquisition of multi-nuclei enhanced NMR/MRI by solution-state dynamic nuclear polarization

Science China Chemistry 2016年第7期59卷 830-835页

作者： Yugui He Zhen Zhang Jiwen Feng Chongyang Huang Fang Chen Chaoyang Liu Maili Liu State Key Laboratory of Magnet Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and MathematicsChinese Academy of SciencesWuhan 430071China School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China University of Chinese Academy of Sciences Beijing 100048China

dynamic nuclear polarization （DNP） has become a very important hyperpolarization method because it can dramatically increase the sensitivity of nuclear magnetic resonance （NMR） of various molecules. Liquid-state DNP based on Overhauser effect is capable of directly enhancing polarization of all kinds of nuclei in the system. The combination of simultaneous Overhauser multi-nuclei enhancements with the multi-nuclei parallel acquisitions provides a variety of important applications in both MR spectroscopy （MRS） and image （MRI）. Here we present two simple illustrative examples for simultaneously enhanced multi-nuclear spectra and images to demonstrate the principle and superiority. We have observed very large simultaneous DNP enhancements for different nuclei, such as XH and 23Na, 1H and 31p, 19F and 31p, especially for the first time to report sodium ion enhancement in liquid. We have also obtained the simultaneous images of 19H and 31p, 19F and 31p at low field by solution-state DNP for the first time.

关键词： dynamic nuclear polarization Overhauser effect simultaneous acquisition phosphorous and sodium ion DNP spectra phosphorous DNP image

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MAGNETIC RESONANCE OF CHINESE COALS

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Science China Mathematics 1988年第8期31卷 968-978页

作者：叶朝辉,ROBERT A.WIND,GARY E.MACIEL Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics Academia Sinica Department of Chemistry Colorado State University USA. Department of Chemistry Colorado State University USA.

This paper studies ten Chinese coals at different ranks by means of cross polarization and magic angle spinning, combined rotation and multiple-pulse spectroscopy, and dynamic nuclear polarization. NMR is first reported. It is found that, compared with those obtained previously coat somples from other parts of the world, some Chinese coals at lower ranks display unusual characteristics, which imply peculiar chemical structures in the coals.

关键词： NMR of coals dynamic nuclear polarization high resolution NMR in solids aromaticity of coals.

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