A statistical calculation of monolayer permeation by water

Barnes G.T., Quickenden T.I. and Saylor J.E. (1970) A statistical calculation of monolayer permeation by water. Journal of Colloid And Interface Science, 33 2: 236-243. doi:10.1016/0021-9797(70)90025-1

Author Barnes G.T.
Quickenden T.I.
Saylor J.E.
Title A statistical calculation of monolayer permeation by water
Journal name Journal of Colloid And Interface Science   Check publisher's open access policy
ISSN 0021-9797
Publication date 1970-01-01
Sub-type Article (original research)
DOI 10.1016/0021-9797(70)90025-1
Volume 33
Issue 2
Start page 236
End page 243
Total pages 8
Language eng
Subject 1505 Marketing
1606 Political Science
3110 Surfaces and Interfaces
Abstract The resistance of monolayers to the passage of water molecules has been calculated from a model in which the monolayer is represented by a random array of hard disks and the permeating water molecules are represented by hard spheres. Permeation is assumed to take place only through sufficiently large holes which form spontaneously in the monolayer. The distribution of such holes was determined by examination of high-speed photographs of an agitated tray of metal spheres. It is assumed that water evaporates through the monolayer holes at the normal rate for a free water surface, so that the absolute rate of evaporation through the monolayer (νf 0) is given by: vf0 = vw 0a/A where νw 0 is the absolute rate of evaporation through a clean water surface and a/A is the fraction of the surface occupied by suitable holes. The magnitudes of the resistances calculated from the model are in reasonable agreement with experimental data for monolayers of long-chain alcohols although the experimentally observed effect of alcohol chain length is not allowed for in the model. There is very close correspondence between the calculated and experimental dependences of resistance upon the concentration of monolayer molecules in the surface. The model predicts only a very small temperature dependence for the evaporation resistance if the surface concentration is held constant.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
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