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. 2014 Apr 16;1(5):464–470. doi: 10.1021/ph500091h

Figure 4.

Figure 4

Fluorescence snapshots of dielectrophoretic manipulation of labeled polystyrene beads (190 nm diameter) suspended in water using template-stripped gold pyramidal tip. Fluorescence images of the pyramid before applying potential with (A) focusing on the pyramid base and (B–D) focusing on the pyramid apex. Fluorescence images of the pyramid with applied potential of 10 Vpp and frequency of (C) 100 kHz (positive DEP) and (D) 10 MHz (negative DEP). In (C) a single 190 nm bead is trapped at the apex. The white dotted square in (A) marks the region showed in (B–D). The scale bar is 20 μm in (A) and 5 μm in (B–D).