Abstract
In recent years, aerosol-induced haze problem has become a serious environmental concern. High-efficiency particulate air (HEPA) filters are in great demand to effectively remove aerosols from gas streams for both personal protection and public health. Due to their ultrathin diameters, excellent mechanical strength, and extremely high specific surface areas, carbon nanotubes (CNTs), which can work in the free molecular flow (FMF) regime, exhibit many advantages for fabricating HEPA filters with both high efficiency and low air resistance. In this chapter, we first give a brief introduction on the filtration mechanism of aerosol particles on nanofibers and the filtration performance evaluation of filters. Then, we introduce the main progress in HEPA filters based on CNTs in the FMF regime.
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