钠沸石纳米通道中的质子偶极自旋-晶格弛豫

Proton Dipolar Spin-Lattice Relaxation in Nano-channels of Natrolite.

作者信息

Paczwa M, Sapiga A A, Olszewski M, Sergeev N A, Sapiga A V

机构信息

Department of Mathematical and Physics, Institute of Physics, University of Szczecin, Wielkopolska str.-15, 70-451 Szczecin, Poland.

V.I.Vernadsky Crimean Federal University, 295007 Simferopol, Crimea.

出版信息

Appl Magn Reson. 2016;47:895-902. doi: 10.1007/s00723-016-0805-5. Epub 2016 Jun 25.

DOI:10.1007/s00723-016-0805-5

PMID:27489405

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC4956723/

Abstract

The H nuclear magnetic resonance (NMR) spectra and the dipolar spin-lattice relaxation time for H in the natural natrolite (NaAlSiO·2HO) have been measured in the temperature range of 190-390 K. From the temperature transformations of H NMR spectra, it follows that at > 300 K, the diffusion of water molecules along the nano-channels is observed. From experimental data, it follows that the 180° flip motion of the water molecules takes place in natrolite. At low temperature ( < 250 K), the dipolar interaction with paramagnetic impurities as a relaxation mechanism of H nuclei becomes significant.

摘要

在190 - 390 K的温度范围内，测量了天然钠沸石（NaAlSiO₄·2H₂O）中氢的核磁共振（NMR）谱以及氢的偶极自旋 - 晶格弛豫时间。从氢核磁共振谱的温度变化可以看出，在温度高于300 K时，观察到水分子沿纳米通道的扩散。从实验数据可知，水分子在钠沸石中发生180°翻转运动。在低温（低于250 K）时，与顺磁性杂质的偶极相互作用作为氢核的弛豫机制变得显著。