Biomedical Engineering Reference
In-Depth Information
Figure 10.21
Stacked “Christmas-tree” asymmetric electrodes. These two pairs of electrodes are
addressed successively.
each other. A high frequency ac voltage is successively applied between the two
electrodes of each slide.
This situation emphasizes some of the difficulties listed above: negative dielec-
trophoresis is difficult to deal with in this particular geometry as the regions of
weakest electric field are located outside of the central channel, therefore expelling
Figure 10.22
Behavior of 0.5-
m
m latex beads when the voltage is switched from the lower set of
electrodes (light gray) (a) to the upper set (dark gray) (b, c). (Photo courtesy of L. Talini.)
