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The amphiphilic and aggregation properties of fractionated asphaltenes have been studied using Langmuir trough experiments and Brewster angle microscopy (BAM). In particular, two fractions from three different crude oils have been extracted by using two n-pentane:crude oil volume ratios (3:1 and 18:1) in a two-step precipitation procedure. The concentration dependence of the surface properties and...
We have performed molecular dynamic simulations of linear charged particle models. They are defined by rods with discrete charges at the ends. Intermolecular interactions are described by a coulombic term plus a Kihara potential for the rest of interactions. Our simulations were carried out for low and high charged systems either at thermodynamic states corresponding to the liquid branch of vapor–liquid...
The film forming properties at the air–water interface of asphaltenes from Arabian light crude oil have been investigated experimentally in a Langmuir trough. The stability and dynamical behavior of the films have been studied in compression–decompression cycles and at different temperatures and concentrations of the toluene spreading solution. The results are interpreted in terms of models for the...
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