Selective enhancement of 1H signal from water and oil in porous media at low field with Overhauser DNP

IF 2 3区 化学 Q3 BIOCHEMICAL RESEARCH METHODS Journal of magnetic resonance Pub Date : 2024-11-01 DOI:10.1016/j.jmr.2024.107793
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Abstract

In porous media MR studies, discriminating between oil and water presents a challenge because MR lifetimes are often similar and spectra overlap. Low saturations might suggest an experimental strategy of increasing the static field for increased sensitivity, but susceptibility effects are exacerbated at higher field. Overhauser dynamic nuclear polarization, effective at low static field, was employed with water and oil-soluble nitroxide to selectively enhance water and oil signals. We employ a home-built 2 MHz ceramic magnet to achieve selective enhancement of water and oil, in bulk, and in a rock core. For imaging, we employ a 705 kHz ceramic magnet with a 4 gauss/cm constant gradient configuration to image the hyperpolarized signal. A rock core flooding experiment was undertaken to highlight the advantages of Overhauser enhancement. A simple phase cycling technique may be employed to cancel the thermally polarized 1H signal to isolate the enhanced signal of interest.

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用 Overhauser DNP 在低场条件下选择性增强多孔介质中水和油的 1H 信号
在多孔介质磁共振研究中,区分油和水是一项挑战,因为磁共振寿命通常相似且光谱重叠。低饱和度可能建议采用增加静场以提高灵敏度的实验策略,但在较高的静场下,易感性效应会加剧。过豪泽尔动态核偏振在低静态场下有效,我们使用水溶性和油溶性硝基氧化物来选择性地增强水和油信号。我们使用自制的 2 MHz 陶瓷磁铁来选择性地增强岩芯中的水和油。在成像方面,我们采用 705 kHz 陶瓷磁体,以 4 高斯/厘米的恒定梯度配置对超极化信号进行成像。为了突出奥弗霍瑟增强技术的优势,我们进行了岩心充水实验。可以采用简单的相位循环技术来消除热极化 1H 信号,从而分离出感兴趣的增强信号。
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来源期刊
CiteScore
3.80
自引率
13.60%
发文量
150
审稿时长
69 days
期刊介绍: The Journal of Magnetic Resonance presents original technical and scientific papers in all aspects of magnetic resonance, including nuclear magnetic resonance spectroscopy (NMR) of solids and liquids, electron spin/paramagnetic resonance (EPR), in vivo magnetic resonance imaging (MRI) and spectroscopy (MRS), nuclear quadrupole resonance (NQR) and magnetic resonance phenomena at nearly zero fields or in combination with optics. The Journal''s main aims include deepening the physical principles underlying all these spectroscopies, publishing significant theoretical and experimental results leading to spectral and spatial progress in these areas, and opening new MR-based applications in chemistry, biology and medicine. The Journal also seeks descriptions of novel apparatuses, new experimental protocols, and new procedures of data analysis and interpretation - including computational and quantum-mechanical methods - capable of advancing MR spectroscopy and imaging.
期刊最新文献
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