Microfluidic assembly process showing free particles being added (from top to bottom) into circular cells and subjected to a flow field, visualized by streamlines. Selected for an Editors' Suggestion and a Viewpoint in Physics.

From the article:

Algorithm for a Microfluidic Assembly Line
Tobias M. Schneider, Shreyas Mandre, and Michael P. Brenner
Phys. Rev. Lett. 106, 094503 (2011)

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