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Fig. 4 | Micro and Nano Systems Letters

Fig. 4

From: High-throughput magnetic particle washing in nanoliter droplets using serial injection and splitting

Fig. 4

Snapshots from high speed video of droplet washing. Incoming droplets with high bromophenol blue concentration (dark) are traveling from left to right. The magnetic microparticle is indicated with a red arrow. Droplets encounter the injection channel across from electrodes. Upon injection (24 ms) the microparticle is deflected downward due to the injection pressure. At 48 ms the microparticle has recovered its position at the top portion of the droplet under the influence of a magnetic field from a stationary magnet out of view. Finally the droplet is split into two daughter droplets: the one to be collected (top channel) contains the magnetic microparticle in a lower concentration of bromophenol blue

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