(288b) Particle Manipulation on a Chip Using Conventional and Traveling-Wave Dielectrophoresis

We present the design of a microfluidic device and an ac electrical power supply capable of combining both conventional (DEP) and traveling wave dielectrophoresis (tw-DEP) in a single microchip for the consecutive separation and manipulation of suspended particles according to their electrical properties. The electrical power supply is capable of producing four sinusoidal signals, each shifted 90 degree in phase from the previous, with amplitude of up to 200 V (peak-to-peak) and frequency of up to 250 kHz. We will present the operating principle of the device along with the experimental results on suspensions of ~3 micrometer diameter latex particles dispersed in an aqueous medium.