Interpretation of surface-tension isotherms of n-alkanoic (fatty) acids by means of the van der Waals model

Here we apply the two-dimensional van der Waals model to interpret surface-tension isotherms of aqueous solutions of n-alkanoic (fatty) acids. We processed available experimental data for a homologous series of eight acids, from pentanoic to dodecanoic (lauric). Only three adjustable parameters have...

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Published in:Journal of colloid and interface science 2006-08, Vol.300 (2), p.809-813
Main Authors: Danov, K.D., Kralchevsky, P.A., Ananthapadmanabhan, K.P., Lips, A.
Format: Article
Language:English
Subjects:
Adsorption
Chemistry
Exact sciences and technology
General and physical chemistry
n-Alkanoic acids
Normal fatty acids
Surface (Gibbs) elasticity
Surface physical chemistry
Surface pressure
Surface-tension isotherms
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creator Danov, K.D.
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description Here we apply the two-dimensional van der Waals model to interpret surface-tension isotherms of aqueous solutions of n-alkanoic (fatty) acids. We processed available experimental data for a homologous series of eight acids, from pentanoic to dodecanoic (lauric). Only three adjustable parameters have been varied to fit simultaneously all experimental curves. Excellent agreement between the theoretical model and the experiment has been obtained. The determined parameter values comply well with the molecular properties and allow one to calculate the surfactant adsorption, surface elasticity, and the surface pressure vs area isotherms. For the dodecanoic acid, the van der Waals model indicates the existence of a surface phase transition. By means of the two-dimensional van der Waals model, experimental surface-tension isotherms of eight normal alkanoic acids are simultaneously fitted, and the respective adsorptions, surface pressures and elasticities are determined.
doi_str_mv 10.1016/j.jcis.2006.04.026
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subjects Adsorption
Chemistry
Exact sciences and technology
General and physical chemistry
n-Alkanoic acids
Normal fatty acids
Surface (Gibbs) elasticity
Surface physical chemistry
Surface pressure
Surface-tension isotherms
title Interpretation of surface-tension isotherms of n-alkanoic (fatty) acids by means of the van der Waals model
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