NEW THEORY OF WATER ACTIVITY IN HETEROGENEOUS SYSTEMS

Authors
HILLS BP MANNING CE RIDGE Y
Citation
Bp. Hills et al., NEW THEORY OF WATER ACTIVITY IN HETEROGENEOUS SYSTEMS, Journal of the Chemical Society. Faraday transactions, 92(6), 1996, pp. 979-983
Citations number
19
Categorie Soggetti
Chemistry Physical","Physics, Atomic, Molecular & Chemical
Journal title
Journal of the Chemical Society. Faraday transactions → ACNP
ISSN journal
09565000
Volume
92
Issue
6
Year of publication
1996
Pages
979 - 983
Database
ISI
SICI code
0956-5000(1996)92:6<979:NTOWAI>2.0.ZU;2-L
Abstract
A new theory of water activity in heterogeneous porous systems has bee n proposed in which the observed activity is calculated as the volume average of a local, spatially varying activity determined by the amoun t 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 explanatio n of freezing point depression and hysteresis during adsorption and de sorption.