Abstract
Experiments were performed to investigate the filtration efficiency of electret filters in external electric field. The electret filter layer was located between two conductive nonwovens (electrodes). The top conductive fibrous layer was applied to a DC voltage ranging from 0 to 6.5 kV while the bottom one was grounded. At the DC voltage, a strong external electric field was generated between the two conductive electrodes, and the electret filter layer can be charged more effectively. The filtration efficiency and the quality factor (QF) were obviously increased with an increase of the applied voltage or electric field in each filter.
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