Figure 2.

Dielectrophoretic properties of RBC and E. coli cells. (a) Cross-over frequency as a function of buffer conductivity. The dotted and solid lines are the multi-shelled spheroid theory results using the parameterization from Table TABLE I.. For comparison, observed cross-over frequencies for RBC on a quad-electrode architecture are shown as points. The selected buffer conductivity and operating frequency for sorting is labeled with an “x.” (b) Dielectrophoretic force as a function of frequency for E. coli and RBCs predicted from the multi-shelled spheroid theory in a buffer with a conductivity of 0.13 S/m. The component of the force normal to the electrode is presented at the channel center and electrode edge. The dashed line indicates an operating frequency of 500 kHz.