WATER-SATURATED MESOPOROUS MCM-41 SYSTEMS CHARACTERIZED BY H-1-NMR SPIN-LATTICE RELAXATION-TIMES

被引：76

作者：

HANSEN, EW

SCHMIDT, R

STOCKER, M

AKPORIAYE, D

机构：

[1] SINTEF Oslo, Blindern, 0314 Oslo

来源：

JOURNAL OF PHYSICAL CHEMISTRY | 1995年 / 99卷 / 12期

关键词：

D O I：

10.1021/j100012a040

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Combining spin-lattice relaxation time measurements and signal intensity measurements vs temperature of water confined in mesoporous molecular sieves (MCM-41 materials) gives information regarding the activation enthalpy of bound water and the width of the log-normal distribution of correlation times of the water molecules. Three different water ''phases'' are observed which have significantly different relaxation strength. The overall spin-lattice relaxation rate is shown to be strongly dependent on the number of silanol protons. ''Analytical'' formulas for the average spin-lattice relaxation rates are derived.

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页码：4148 / 4154

页数：7

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