Disjoining Pressure of Polymolecular Adsorbed Films

O. G. Us’yarov* and J. Stawinski**

* Institute of Agrophysics, Russian Academy of Agricultural Sciences, Grazhdanskii pr. 14, St. Petersburg, 195220 Russia
** Institute of Agrophysics, Polish Academy of Sciences, Dosvetchalna 4, Lublin, 20-236 Republic of Poland

Received September 17, 1996

Abstract—The possibility of obtaining information on the disjoining pressure of asymmetrical wetting films
on the basis of experimental data concerning polymolecular adsorption of different substances by porous mate-
rials was studied. The conditions under which this approach is adequate were formulated. Alternative represen-
tation of the initial results concerning polymolecular adsorption was analyzed to establish the effect of the
molecular, ionic electrostatic, and structural components of disjoining pressure on film thickness.

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