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Simulations of a surfactant at the water–oil interface with 50% of water and oil between two solid walls under Poiseuille flow. As is apparent, all the surfactant molecules, representing sodium dodecylsulfate and octaethylene glycol monododecyl ether, remained at the water/oil interface with the hydrophilic head (green) beads facing toward the aqueous phase, whereas the hydrophobic tail (purple) beads tended to face the oil phase (adapted from [33]).
