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제120회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Investigation of site-specific water dynamics inside PEMs using Overhauser Dynamic Nuclear Polarization Nuclear Magnetic Resonance

2017년 8월 31일 16시 27분 04초
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목 09시 : 10분
Analytical Chemistry - Oral Presentation of Young Analytical Chemists I
저자 및
Seung-Bo Saun*, Oc Hee Han, JiWon Kim1
Western Seoul Center, Korea Basic Science Institute, Korea
1Department of Chemistry and Nano Science, Ewha Womans University, Korea
Nuclear Magnetic Resonance (NMR) is widely used in many fields such as physics, chemistry, biology and medicine. It provides structural and dynamic information of matter through its non-destructive and chemically selective detection. Overhauser Dynamic Nuclear Polarization (ODNP) is the technic that enhances NMR signal using interaction between electron spins and nuclear spins and signals can be amplified to about order of 10 to 100 times[1]. To apply ODNP in non-magnetic materials, spin labels are positioned to specific points of samples as a donor of electron spins. ODNP technic uses dipolar interaction between electron spins and nuclear spins and it is possible to selectively enhance and observe NMR signals near the site of spin labels with 1 nm spatial resolution and the enhancement effect of ODNP is related to the relative mobility of nuclear bearing particles and electron spins. Therefore, ODNP enables to observe local dynamics of particles near spin labels inside samples[2]. We have constructed X-band ODNP-NMR system by modifying an EPR spectrometer and an NMR spectrometer. Using this system, water dynamics inside Nafion was investigated as a function of concentration of various spin labels. [1] J. M. Franck et al. Prog. in NMR Spectroscopy 74 33-56 (2013) [2] B. D. Armstrong and S. Han The Jour. of Chem. Phys. 127 104508 (2007)