Abstract

SANDOVAL-IBARRA, Federico D.; LOPEZ-CERVANTES, José L.  and  GRACIA-FADRIQUE, Jesús. Langmuir's Equation for simple liquids and surfactants. Educ. quím [online]. 2015, vol.26, n.4, pp.307-313. ISSN 0187-893X.  https://doi.org/10.1016/j.eq.2015.03.002.

The Langmuir isotherm is one of the most powerful and descriptive models for the adsorption process. Applied to fluid interfaces, in conjunction with Gibbs adsorption equation, it provides a meaningful physical description of surface tension on a molecular level. The resulting equation could be expressed as a function of volumetric phase composition or surface phase composition to calculate critical micelle concentration of surfactants in solution, as well as the adsorption and aggregation energies in a direct way, avoiding the use of empirical constants. In this work, the multiple advantages of the Langmuir model and its application to the calculation of these properties are presented.

Keywords : Langmuir; Surface; Isotherm; Adsorption; Surfactants; Micelle.

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