Abstract
A series of molecular dynamics simulations were performed to investigate the adsorption of violanthrone-79 (VO-79) as a model asphaltene compound on quartz surface in different organic solvents (n-heptane, toluene, and heptol with three different n-heptane/toluene volume ratios). Our simulations demonstrated that the type of solvent had a great impact on the kinetics of adsorption, such as the adsorption rate and final adsorption amount. However, the equilibrium modes of adsorption were similar: both monomer and aggregate adsorptions were observed regardless of the n-heptane and toluene contents. With monomer adsorption, the polyaromatic core (PAC) of VO-79 was merely parallel to the surface, whereas the PACs showed two types of orientations in aggregate adsorption—parallel and slant—with the majority of them slant to the surface, maintaining π–π stacking between neighboring PACs. Energetic analyses showed that the adsorption was driven primarily by van der Waals forces, accompanied by electrostatic inter...
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