Resumen

SANDOVAL-IBARRA, Federico D.; LOPEZ-CERVANTES, José L.  y  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.

Palabras llave : Langmuir; Surface; Isotherm; Adsorption; Surfactants; Micelle.