Keywords
espesor de película interfacial
tensión interfacial.
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Abstract
En este trabajo, usando dinámica molecular se determinaron las propiedades interfaciales y el comportamiento del Dodecil Sulfato de Sodio (SDS) ubicado en la región interfacial de los sistemas vacío/agua y agua/n-octano. La tensión interfacial fue estimada con el modelo propuesto por Kirkwood y Buff [23]. A su vez, los espesores de película interfacial fueron determinados usando los criterios 10-90 y 90-90. Además, el área por molécula fue estimado con la variación de la presión superficial en función de la concentración del surfactante. En los sistemas vacío/SDS/agua, el área por molécula del SDS fue obtenida con dos procedimientos diferentes. Los valores fueron 53.3 Ã…2 y 54.3 Ã…2, respectivamente. Para los sistemas agua/n-octano y agua/SDS/n-octano, los espesores de película interfacial aumentan en función del número de moléculas de surfactantes presentes en la región interfacial. Los resultados obtenidos son consistentes con datos medidos por experimentación.
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