AC dielectrophoresis using elliptic electrode geometry

This paper presents negative ac dielectrophoretic investigations using elliptic electrode geometry. simulations of the electric field gradient variation using various ratios of the semimajor and the semiminor axis were carried out to determine the optimum elliptic geometry for the dielectrophoretic electrokinetics of specimen in an assay with laminar (low reynolds number) fluid flow. experimental setup of the elliptic electrode assembly using pcb fabrication and electrokinetic accumulation of specimen in a dielectrophoretic cage is also being reported. using an actuating signal between 1khz and 1mhz,successful trapping of 45m polystyrene beads suspended in distilled water was demonstrated due to negative dielectrophoresis near 100khz using the novel elliptic electrode. © 2011 s. m. rezaul hasan and aanan khurma.