Theoretical calculations on the existence of cohesive force at oil-water interface
01 May 1975-Colloid and Polymer Science (Springer Science and Business Media LLC)-Vol. 253, Iss: 5, pp 422-423
About: This article is published in Colloid and Polymer Science.The article was published on 1975-05-01. It has received 1 citations till now.
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TL;DR: The derived pressure-area data of the unionized acids have been found to obey Langmuir's equation of state for the mobile monolayer whereby the co-area ( A 0 ) per adsorbed molecule has been evaluated.
Abstract: Interfacial tension of the oil/water system has been measured by the drop-volume method as a function of the aqueous concentration of a number of short-chain monocarboxylic acids and their sodium salts. The derived pressure-area data of the unionized acids have been found to obey, in general, Langmuir's equation of state for the mobile monolayer whereby the co-area ( A 0 ) per adsorbed molecule has been evaluated. The data have also been found to fit satisfactorily with the adsorption isotherm for the mobile monolayer at the liquid-liquid interface. The adsorption energies of the acids and their sodium salts calculated with the help of this isotherm have been compared.
26 citations
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TL;DR: In this article, the van der Waals equation for cohesive surface pressure for the monolayer of long-chain quarternary ammonium ions has been found to vary linearly with the inverse square of the area per molecule in the lower range of surface concentration.
Abstract: The cohesive surface pressure for the monolayer of long-chain quarternary ammonium ions has been found to vary linearly with the inverse square of the area per molecule in the lower range of surface concentration. This linear behavior has been explained on the basis of the van der Waals equation for cohesive pressure applied to the surface phase of definite thickness. From the comparison of values of the van der Waals constant for attraction in two and three dimensions, the thickness of the surface phase containing an ionized monolayer has been estimated. At the region of higher surface concentration, the adsorbed long-chain ions have been found to aggregate forming surface micelles. The aggregation number of these micelles has been estimated.
24 citations
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