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Surface ‘Magnus’ Effect. (a) A circular particle forced to rotate while translating in a Π-thickening surfactant follows a Magnus-like trajectory (b) Surfactant in front fo the translating disk has higher surface viscosity than the surfactant behind the disk, owing to the higher surface pressure. Consequently, the rotation of the particle causes it to ‘roll’ upwards, perpendicular to the direction of forcing (Manikantan & Squires 2017a).
