Issue 22, 2001

Adsorption of surfactants at air/solution interfaces: theoretical description of adsorption equilibrium based on a model of clustering of the surfactant molecules at the air/solution interface

Abstract

On the basis of the scaled particle theory, a new theoretical approach is developed for adsorption of surfactants capable of forming two-dimensional aggregates at the air/solution interface. The adsorption layer is treated as a mixture of oblate aggregates of various dimensions, interacting via excluded area interactions. A five-parameter equation for the adsorption isotherm is developed, and then integrated to obtain the surface tension isotherm. Experimental surface tension data of a series of n-alkyldimethylphosphine oxides are used for comparison with the equation derived. The numerical best-fit analysis suggests the formation of small aggregates at the air/solution interface for these surfactants. The model parameters obtained while fitting best the model equation to the experimental data show a linear correlation with the alkyl chain length of the surfactant.

Article information

Article type
Paper
Submitted
02 Aug 2001
Accepted
14 Sep 2001
First published
09 Nov 2001

Phys. Chem. Chem. Phys., 2001,3, 5035-5042

Adsorption of surfactants at air/solution interfaces: theoretical description of adsorption equilibrium based on a model of clustering of the surfactant molecules at the air/solution interface

M. Drach, W. Rudziński, P. Warszyński and J. Narkiewicz-Michałek, Phys. Chem. Chem. Phys., 2001, 3, 5035 DOI: 10.1039/B107019N

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