The fitting parameter for Langmuir EOS Γ ∞ : surface excess coverage, was found to be 3.2 molecules/nm 2 corresponding to a cross-section area of 0.3125 nm 2 , which is in agreement with the reported range by Chaverot and coworkers . These results are consistent with the Yen-Mullins model (Mullins 2010, ) and corresponds to the average size of polyaromatic hydrocarbon core in asphaltenes (6-8 rings) and to their conformation at the interface with aromatic cores lying flat at the interface and alkyl chains tending perpendicular into the oil phase. Asphaltene adsorption studies on solid surfaces also indicate similar results, that absorption occurs face-on on hydroxyl substrates in order to maximize the polar-polar interactions between the hydroxyl groups and aromatic center of asphaltenes . Copyright (2013) American Chemical Society.)