Observation of NMR signals from samples with flat geometry: Application to in-situ analysis of a direct ethanol fuel cell

IF 2 3区化学 Q3 BIOCHEMICAL RESEARCH METHODS

Journal of magnetic resonance Pub Date : 2025-01-17 DOI:10.1016/j.jmr.2025.107831

Minchae Kwak , Minji Kim , Dong-Hyun Peck , Seong-Joo Lee , Jeong Hyun Shim , Oc Hee Han , Jung Ho Lee

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Abstract

Most NMR samples are cylindrical, which is ideal for obtaining high-resolution NMR spectra, especially in superconducting magnets with a vertical bore. However, expanding NMR applicability to samples that are not necessarily cylindrical requires a new approach. In this study, we introduce a method for obtaining solution NMR signals from flat samples, such as flat containers or layered structures like a fuel cell. A flat rectangular NMR coil was developed for RF application and sensitive signal detection, while biplanar shim coils were designed using Bfieldtools and manufactured on multilayered printed circuit boards to improve NMR resolution. Water and ethanol molecules in flat rectangular and flat circular containers, as well as in a direct ethanol fuel cell, were observed with narrow NMR linewidths. We believe that our spectrometer design will enable NMR analysis of samples that need to be contained in flat structures and support in-situ analysis of various devices.

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从平面几何样品中观察核磁共振信号：应用于直接乙醇燃料电池的原位分析。

大多数核磁共振样品是圆柱形的，这是获得高分辨率核磁共振光谱的理想选择，特别是在具有垂直孔的超导磁体中。然而，将核磁共振的适用性扩展到不一定是圆柱形的样品需要一种新的方法。在本研究中，我们介绍了一种从扁平样品（如扁平容器或分层结构，如燃料电池）中获取溶液核磁共振信号的方法。设计了一种用于射频应用和敏感信号检测的平面矩形核磁共振线圈，利用Bfieldtools设计了双平面薄片线圈，并在多层印刷电路板上制造，以提高核磁共振分辨率。水和乙醇分子在扁平的矩形容器和扁平的圆形容器中，以及在直接乙醇燃料电池中，用较窄的NMR线宽进行了观察。我们相信我们的光谱仪设计将能够对需要包含在平面结构中的样品进行核磁共振分析，并支持各种设备的原位分析。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of magnetic resonance 物理-光谱学

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.