Figure 2.

Characterization of magnetic forces in fluidic flow. a) Extracted force as a function of position from two particle traces. This is at a coverslips’ distance away from the micromagnet array. b) Images of localized magnetic particles at two time points of high-speed capture of particles at a tagged-coverslip surface. Particles rapidly aggregate at magnetic field minima. c) Diagram of the additive potential of our stretchable micromagnet array. A simple microfluidic channel is tagged by our magnetic material. Selected frames are from a time-lapse movie of particles manipulated against fluidic flow. Blue arrows indicate direction of particle manipulation against the driving fluid. Particles can be tunably manipulated against the fluidic flow of the channel via positional morphing and tagging of the flexible micromagnet array. Scale bars are 200 μm.