Fig. 1. SEM images of the filter sample.
Fig. 2. Schematic of filter charging system.
Fig. 3. Experimental setup for filtration test.
Fig. 5. Overall filtration efficiency with (a) various charging time and (b) various electrode distance.
Fig. 6. Charging effectiveness and increasing rates of surface potentials (a) by charging time and (b) by electrode distance.
Fig. 4. (a) Size distribution of inlet particles and partial filtration efficiency of fabricated electret filters at 3 cm/s of filtration velocity, and (b) the efficiency under various filtration velocities when applied voltage, charging time, and charging distance were of -10 kV, 5 minutes, and 15 mm, respectively.
Fig. 7. (a) Overall filtration efficiency for single-side and both-side charged electret filters and (b) partial filtration efficiency for each particle size when filtration velocity is 5 cm/s.
Table 1. Experimental condition
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