400 MHz NMR-Spectrometer for 9,4 T Magnet

用于 9.4 T 磁体的 400 MHz 核磁共振波谱仪

• 批准号: 514803260
• 金额: --
• 依托单位: Universität Leipzig
• 依托单位国家: 德国
• 项目类别: Major Research Instrumentation
• 财政年份: 2023
• 资助国家: 德国
• 起止时间: 2022-12-31 至 无数据
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/514803260?language=en
• 关键词: 400; MHz; NMR; Spectrometer; Magnet

Diffusion is a ubiquitous process in nature and pulsed field gradient NMR is a powerful experimental technique to probe diffusion processes on the most relevant length scale in the micrometer range. In heterogeneous, porous materials - besides complex structure - transport relationships and different types of phase transitions occurring in the pore spaces further complicate the transport processes. Their understanding may lay down a new approach for obtaining deeper insight into various equilibrium and non-equilibrium processes occurring in the pore spaces and for structural characterization of complex pore networks, including hierarchical pore systems. This challenging task will be addressed by complementing the NMR spectrometer (i) by a home-built pulsed field gradient unit that allows for probing diffusion processes down to hundred nanometers with the option of spectral selectivity by using magic angle spinning diffusion NMR and (ii) by in-situ pressure and temperature variation equipment with the option to maintain their gradients across the sample. In the latter case, the NMR microimaging (micro-MRI) capability will be used for spatially-resolved measurements of non-equilibrium and steady-state processes. Complementary “dynamic” imaging, where the diffusion patterns probed are used for elucidating the local structural properties of ordered and disordered pore systems, and high-resolution microimaging studies will be used to better understand the relationship between microstructure and MRI contrast maps.

扩散是自然界中普遍存在的过程，脉冲场梯度核磁共振是一种强大的实验技术，可以在微米范围内最相关的长度尺度上探测扩散过程。在非均质多孔材料中，除了复杂的结构外，在孔隙空间中发生的输运关系和不同类型的相变进一步使输运过程复杂化。他们的理解可能为更深入地了解孔隙空间中发生的各种平衡和非平衡过程以及复杂孔隙网络（包括分层孔隙系统）的结构表征提供了新的途径。这一具有挑战性的任务将通过补充核磁共振光谱仪来解决(i)由一个自制的脉冲场梯度单元，允许探测扩散过程到100纳米，通过使用魔角旋转扩散核磁共振选择光谱选择性；（ii）通过现场压力和温度变化设备，选择在样品上保持其梯度。在后一种情况下，核磁共振微成像（micro-MRI）能力将用于非平衡和稳态过程的空间分辨测量。互补的“动态”成像，其中探测的扩散模式用于阐明有序和无序孔隙系统的局部结构特性，高分辨率微成像研究将用于更好地理解微观结构与MRI对比图之间的关系。