Evidence for single file diffusion of ethane in the molecular sieve AlPO4-5

被引：135

作者：

Gupta, V ^{[1
]}

Nivarthi, SS ^{[1
]}

McCormick, AV ^{[1
]}

Davis, HT ^{[1
]}

机构：

[1] UNIV MINNESOTA,DEPT CHEM ENGN & MAT SCI,MINNEAPOLIS,MN 55455

来源：

CHEMICAL PHYSICS LETTERS | 1995年 / 247卷 / 4-6期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/S0009-2614(95)01246-X

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：

We measure the diffusion of ethane in very large crystals of the molecular sieve AIPO(4)-5 (provided by M. Davis) using pulsed field gradient (PFG) NMR. Thanks to the large crystal size and the long longitudinal relaxation time, the mean square displacement could be monitored over times that arranged over an order of magnitude. The mean square displacement was proportional to the square root of time, providing strong evidence that the ethane molecules are moving in a single file, i.e. they are unable to pass each other. This is the first direct experimental evidence for single-file diffusive motion - a phenomenon that is probably widely prevalent in both industrial catalytic and biological systems.

引用

页码：596 / 600

页数：5

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