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The effect of shape asymmetry of microswimmers on their adsorption capacityat confining channel walls is studied by a simple dumbbell model. For a shapepolarity of a forward-swimming cone, like the stroke-averaged shape of a sperm,extremely long wall retention times are found, caused by a non-vanishingcomponent of the propulsion force pointing steadily into the wall, which growsexponentially with the self-propulsion velocity and the shape asymmetry. Adirect duality relation between shape asymmetry and wall curvature is proposedand verified. Our results are relevant for the design microswimmer withcontrolled wall-adhesion properties. In addition, we confirm that pressure inactive systems is strongly sensitive to the details of the particle-wallinteractions.

Giant adsorption of microswimmers: duality of shape asymmetry and wall curvature