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Simultaneous transport of 5 and 10 μm beads at the transition zone (a) after 23 s and (b) after 90 s. The applied voltage is U=1000 V. The movie shows the transport and demonstrates the considerable internal motion that is observed within the cluster. From time to time, the camera position is manually adjusted in order to track the bead cluster moving from left to right (enhanced online).[URL: http://dx.doi.org/10.1063/1.3555194.2]
