二氧化硅表面的自由基:用快场循环弛豫法和动态核极化法研究动力学的探针

IF 1.7
Bulat Gizatullin, Carlos Mattea, Siegfried Stapf
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引用次数: 2

摘要

确定纳米多孔材料上吸附液体的动力学对于详细了解许多材料和多孔系统中固液界面上的相互作用和过程至关重要。了解顺磁性物质在多孔基质表面或内部的存在对基础研究和工业过程(如催化剂)的影响至关重要。磁共振方法,如电子顺磁共振(EPR)、核磁共振(NMR)和动态核极化(DNP),是解决这些问题和量化动力学、电子-核相互作用特征及其与系统物理化学参数关系的有力工具。本文研究了水、正癸烷、氘水和壬烷-d20等极性和非极性吸附液体在天然二氧化硅表面以及钒基卟啉改性二氧化硅表面的动力学。核自旋-晶格弛豫时间的频率依赖性分析是通过分离分子内和分子间的贡献来进行的,它们分别使用平动位移(RMTD)和无力硬球(FFHS)模型进行了定向分析。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Radicals on the silica surface: probes for studying dynamics by means of fast field cycling relaxometry and dynamic nuclear polarization

Radicals on the silica surface: probes for studying dynamics by means of fast field cycling relaxometry and dynamic nuclear polarization

Determining the dynamics of adsorbed liquids on nanoporous materials is crucial for a detailed understanding of interactions and processes on the solid-liquid interface in many materials and porous systems. Knowledge of the influence of the presence of paramagnetic species on the surface or within the porous matrices is essential for fundamental studies and industrial processes such as catalysts. Magnetic resonance methods, such as electron paramagnetic resonance (EPR), nuclear magnetic resonance (NMR) and dynamic nuclear polarization (DNP), are powerful tools to address these questions and to quantify dynamics, electron-nuclear interaction features and their relation to the physical-chemical parameters of the system. This paper presents an NMR study of the dynamics of polar and nonpolar adsorbed liquids, represented by water, n-decane, deuterated water and nonane-d20, on the native silica surface as well as silica modified with vanadyl porphyrins. The analysis of the frequency dependence of the nuclear spin-lattice relaxation time is carried out by separating the intra- and intermolecular contributions, which were analyzed using reorientations mediated by translational displacements (RMTD) and force-free-hard-sphere (FFHS) models, respectively.

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来源期刊
Magnetic Resonance Letters
Magnetic Resonance Letters Analytical Chemistry, Spectroscopy, Radiology and Imaging, Biochemistry, Genetics and Molecular Biology (General)
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