Dielectrophoretic Particle Filtration in Porous Media (GRK 1860)
As shown in the figure, the porous filter is placed between two electrodes that generate an electric field. By polarization of the filter material the electric field is disturbed resulting in field inhomogeneities that pull particles to the pore wall, where they stay until the electric field is switched off. To prevent mechanical trapping the used particles (diameter: 0.2 µm – 10 µm) are at least one order of magnitude smaller than the pore diameter of the porous structures. This allows switchable filtration with low pressure loss and negligible fouling.
Microscopic photograph of fluorescent 5 µm polystyrene particles (green) in a microchannel containing feld disturbing pillars. Without field (left), the particles pass the structure unaffected. When a field is applied (right), particles are trapped due to positive DEP forces at the pillar surfaces.
DEP filter chanber containing the porous ceramics sandwiched between the electrodes.
Photograph of the ceramic filter.
Ceramic filter, colored green due to the amount of trapped particles.
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