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Deterministic lateral displacement for selective particle trapping

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Deterministic lateral displacement (DLD) is a technique widely used in microfluidics for size-based separation. DLD devices typically consists of an array of static micro-posts that deflect the motion of oncoming particles using steric repulsion. In this project, we expand the concept of DLD by showing that a system with a rotational and translational motion near a solid boundary can trap and transport passive particles. Trapping is achieved because free-flowing finite-size particles cannot follow flow streamlines as a result of their collision with a solid boundary, and thus have move laterally to into a flow vortex in which they are trapped. The trapping mechanism is explained analytically in two dimensions and investigated numerically for rolling ellipsoids in three dimensions.

This talk is part of the DAMTP BioLunch series.

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