Inverse Problem of Air Filtration of Nanoparticles: Optimal Quality Factors of Fibrous Filters

Table 1

Improvement of filtration performance of fibrous filters by morphology modification.

Type	Improved performance	Possible reasons	Reference
Adding beaded nanofibers	Exhibited better filtration performance for aerosol particles ranging from 20 to 300 nm than nanofibers and particle/nanofiber composites	Increased void volume and aspect ratio	[20]
Coating multisize nanoparticles on electrospun nanofibers	Complimentary filtration efficiency (99.989%) and pressure drop (117 Pa) for 300–500 nm NaCl aerosol particles	Rough surface and noncircular cross section of fibers	[21]
Depositing a low amount of carbon nanotube (CNT) films	Filtration efficiency >99% in all cases and meeting the guidelines of HEPA filters; higher pressure drops but better QFs than the substrate	A broad micropore size distribution and a few mesopores between CNTs	[22]
In situ growth of brush-like CNTs on quartz fibers	Pressure drop moderately enhanced, but QF improved fairly well	Slightly reduced pore sizes, much larger specific surface area	[23, 24]