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Evidence of Polymolecular Film Formation During the Adsorption of Water and Ethylene Dibromide on Glass Spheres^{1, 2,}

ABSTRACT

The importance of adsorptive forces in monodispersed glass bead systems, at high relative pressures, was studied during the adsorption of water and ethylene dibromide by microscopic Pyrex and alkali glass beads, i.e., ideal soil. The analysis of the adsorption data by the Frenkel-Halsey-Hill isotherm equation, applicable at high surface coverages, allowed differentiation between capillary condensation and multilayer adsorption. Polymolecular adsorption accounted for all adsorption of water up to P/P₀ = 0.98 with no indication of condensation. The type of glass had a marked effect on the nature of water interaction. Evidence is presented which indicates that both ethylene dibromide and ethyl alcohol (data from literature) exhibit phase transitions in the multilayer region of adsorption.

¹ Support of this work by a grant (NSF—G19897) from the National Science Foundation is gratefully acknowledged.

² Contribution of the Department of Soils and Plant Nutrition, University of California, Davis.

³ Assistant Soil Chemist, Laboratory Technician IV, and Assistant Professor of Soil Physics, University of California, respectively.

Received for publication December 8, 1961. Accepted for publication February 12, 1962.