New theory of water activity in heterogeneous systems

被引：21

作者：

Hills, BP

Manning, CE

Ridge, Y

机构：

[1] Institute of Food Research, Colney, Norwich, NR4 7UA, Norwich Research Park

来源：

JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS | 1996年 / 92卷 / 06期

关键词：

D O I：

10.1039/ft9969200979

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：

A new theory of water activity in heterogeneous porous systems has been proposed in which the observed activity is calculated as the volume average of a local, spatially varying activity determined by the amount of bulk, surface or structural water at each location in the system. The new theory accounts quantitatively for the sorption isotherms in a variety of model porous systems and provides a consistent explanation of freezing point depression and hysteresis during adsorption and desorption.

引用

页码：979 / 983

页数：5

共 19 条

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