The dynamic interfacial tension of a water-model oil interface decreases with adsorption of asphaltenes . Initially the interfacial tension decreases rapidly and varies linearly with the square root of time, indicating diffusion-controlled adsorption . Asphaltene adsorption onto stainless-steel surface measured by a quartz crystal microbalance (QCM) technique showed that at initial times the adsorbed mass of asphaltenes on the stainless-steel surface varies linearly with the square root of time, implying a diffusion-controlled process . This is consistent with dynamic interfacial tension of asphaltenes at the oil-water interface ).