CAREER: Development of Continuous-Flow Laser-Spin Polarized Xe-129 NMR Spectroscopy in Magnetic Stray Fields for the Investigation of Nanoporous Materials

在这个由化学部实验物理化学计划资助的项目中，Meersmann将联合收割机连续流激光自旋极化129 π核磁共振光谱与脉冲场梯度扩散技术相结合，开发一种非侵入性分析技术，可以研究多孔基质材料的孔隙率，孔径分布和孔连通性。磁杂散场与连续流激光偏振氙核磁共振（NMR）的组合将用于研究具有小扩散常数的材料中的长程结构有序。一个重要的系统，将探讨这种新技术是一维纳米通道，是由非常缓慢的单列扩散过程驱动的气体动力学。各种新的现象，如氙的线形与扩散或协同簇扩散的相关性，可以探索第一次与这些实验。将开发一种非侵入性分析技术，以提供有关多孔材料的孔隙度、孔径分布和孔连通性的信息。纳米通道在工业催化、地质和生物过程中发挥着重要作用。这项研究的结果预计将对涉及多相催化、分离过程的材料科学以及对基础物理化学的理解做出重大贡献。研究生和本科生将参与这项研究。他们将获得前沿研究技术的优秀培训，为深造或进入科学/技术劳动力做准备。

In this project funded by the Experimental Physical Chemistry Program of the Chemistry Division, Meersmann will combine continuous-flow laser-spin-polarized 129Xe nuclear magnetic resonance spectroscopy with pulsed-field-gradient diffusion techniques to develop a non-invasive analytical technique that allows the study of porosity, pore-size distribution and pore connectivity in porous host materials. A combination of magnetic stray fields with continuous flow laser polarized xenon Nuclear Magnetic Resonance (NMR) will be used to study long range structural order in materials with small diffusion constants. An important system that will be probed with this new technique is the gas dynamics in one-dimensional nanochannels that is driven by very slow single-file diffusion processes. A variety of novel phenomena such as the correlation of xenon lineshape with diffusion or concerted cluster diffusion can be probed for the first time with these experiments. A non-invasive analytical technique will be developed to provide information about the porosity, pore-size distribution and pore connectivity of porous materials. Nano-channels play an important role in a wide range of industrial catalytic, geologic and biological processes. The results of this research are expected to make a significant contribution to material science concerned with heterogeneous catalysis, separation processes and in the understanding of fundamental physical chemistry. Graduate and undergraduate students will participate in this research. They will gain excellent training in forefront research techniques in preparation for advanced studies or entry into the scientific/technological workforce.