Abstract
Having a long history in aerosol filtration technologies, electret filters are one of the basic solutions to provide high particle capture efficiency at a low pressure drop and energy expense. However, their reliability is still an ongoing issue from the aspects of high efficiency and stability. In this chapter the theory behind electret mechanism, charging of the fibrous materials, their discharging and stability were reviewed in detail. Physics behind the widely used electret filter charging/polarization mechanisms were also discussed.
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