Microscopic propellers that transport and release cargo in fluid media are of growing interest for applications in biomedicine, targeted drug delivery, and microfluidics. The authors demonstrate a general method for assembling and propelling maneuverable colloidal carpets, which can be steered in any direction of the plane by modulating a magnetic field. They also reveal a hydrodynamic ``conveyor-belt effect'' generated by the moving structure that may be useful in fluid-dynamics applications.
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A 2015 study studied this question.