Dynamics of Guest Water Molecules in Pillared Mordenite Studied by 1H NMR Relaxation

IF 1.1 4区物理与天体物理 Q4 PHYSICS, ATOMIC, MOLECULAR & CHEMICAL

Applied Magnetic Resonance Pub Date : 2023-08-08 DOI:10.1007/s00723-023-01589-w

Marina G. Shelyapina, Denis Yu. Nefedov, Anastasiia O. Antonenko, H’Linh Hmok, Andrei V. Egorov, Maria I. Egorova, Alexandr V. Ievlev, Rosario Yocupicio-Gaxiola, Vitalii Petranovskii, Joel Antúnez-García, Sergio Fuentes

引用次数: 0

Abstract

The dynamics of H₂O molecules confined in mesopores of about 3.4 nm in size, formed by amorphous SiO₂ pillars separating 2D mordenite nanolayers, was probed by ¹H nuclear magnetic relaxation. ¹H nuclear magnetic resonance (NMR) spectra evidence the presence of water with different local surroundings and mobility. The temperature dependence of ¹H spin–lattice relaxation T₁ and relaxation in rotating frame T_1ρ indicate the complex behavior of nanoconfined water that can be characterized by different activation energies: freezing (29 kJ/mol), fast rotation (12 kJ/mol), and translational motion (23.6 kJ/mol).

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柱状丝光沸石中客体水分子动力学的1H NMR弛豫研究

采用1H核磁弛豫技术研究了由非晶态SiO2柱分离二维丝光沸石纳米层形成的约3.4 nm大小的介孔中H2O分子的动力学。1H核磁共振(NMR)谱证明了水的存在，但其局部环境和流动性不同。1H自旋-晶格弛豫T1和旋转框架弛豫T1ρ的温度依赖性表明纳米密闭水的复杂行为可以通过不同的活化能来表征:冻结(29 kJ/mol)、快速旋转(12 kJ/mol)和平移(23.6 kJ/mol)。

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

Applied Magnetic Resonance 物理-光谱学

CiteScore

1.90

自引率

10.00%

发文量

审稿时长

2.3 months

期刊介绍： Applied Magnetic Resonance provides an international forum for the application of magnetic resonance in physics, chemistry, biology, medicine, geochemistry, ecology, engineering, and related fields. The contents include articles with a strong emphasis on new applications, and on new experimental methods. Additional features include book reviews and Letters to the Editor.