Surface Activity And Dynamics Of Asphaltenes
A series of surface tension measurements were performed to study the surface activities as well as the dynamics of Ratawi asphaltenes in organic solvents. Nitrobenzene and pyridine were found to be good candidates for this study. The results indicate that asphaltene molecules are surface active and thermodynamically reversible during the micellization and dissociation processes, similar to surfactant solutions. Due to the structural complexity, the micellization and dissociation kinetics are considerably slower than surfactant systems. This study provides solid evidence that asphaltenes are surfactant-like molecules, unlike the previously hypothesized concept that maltenes are the only surfactant-like component in petroleum.
KeywordsSurface Tension Critical Micelle Concentration Surfactant Solution Surface Tension Measurement Desorption Kinetic
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