多孔材料中的钠核磁共振弛豫

Sodium NMR relaxation in porous materials.

作者信息

Rijniers L A, Magusin P C M M, Huinink H P, Pel L, Kopinga K

机构信息

Department of Applied Physics, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands.

出版信息

J Magn Reson. 2004 Mar;167(1):25-30. doi: 10.1016/j.jmr.2003.11.008.

DOI:10.1016/j.jmr.2003.11.008

PMID:14987594

Abstract

The NMR relaxation of hydrogen nuclei of a fluid in a porous material is generally interpreted in terms of the Brownstein-Tarr model, in which the relaxation rate of the signal is inversely proportional to the pore size. We have investigated whether this model can be applied to the relaxation of Na nuclei in a NaCl solution in a porous material. The results indicate that the ion distribution over the pores can be obtained from an analysis of the Na NMR signal decay, if the pore sizes are roughly below 1 microm. This information is very useful for studies of combined moisture and ion transport in porous building materials.

摘要

多孔材料中流体氢核的核磁共振弛豫通常根据布朗斯坦 - 塔尔模型来解释，在该模型中信号的弛豫速率与孔径成反比。我们研究了该模型是否可应用于多孔材料中氯化钠溶液里钠核的弛豫。结果表明，如果孔径大致在1微米以下，通过分析钠核磁共振信号衰减就能获得孔隙上的离子分布。该信息对于研究多孔建筑材料中水分和离子的联合传输非常有用。