Design and Characterization of Electrospun Polyamide Nanofiber Media for Air Filtration Applications

Table 3

The overview of filter quality factors obtained by different authors for most penetrating particle size (300 nm).

Study	Material	Fiber diameter, nm	Quality factor, Pa^−1	Comments
Wang et al., 2008 [13]	N/A	150	𝐴 = 0.048; 𝐵 = 0.025; 𝐶 = 0.029; 𝐷 = 0.020	Quality factor (QF) for face velocity (𝑈)=5 cm/s was interpolated
Zhang et al., 2009 [23]	PA 6	110–150; 70–100; 60–90	15 wt% = 0.036; 12 wt% = 0.020; 10 wt% = 0.016	𝑈 which was applied in filtration is not known, only pressure drop for 𝑈=5 cm/s was interpolated.
Yun et al., 2010 [8]	Polyacrylonitrile; (PAN)	390; 420; 420	BF = 0.235–0.356; CF = 0.094–0.206; NF = 0.051–0.174	BF stands for beaded nanofiber; CF: composite particle nanofiber; NF: nanofibers. The highest value of OF of BF is for 300 nm particles; the highest values of OF of CF and NF are for 20 nm particles. 𝑈=5.3 cm/s
Zhang et al., 2010 [9]	Polyacrylonitrile; (PAN)	200	PAN5 = 0.037; PAN15 = 0.023; PAN5x3 = 0.063; PAN15x2 = 0.025	“x3” stands for 3 layers of PAN nanofiber and “x2” stands for 2 layers. 𝑈=5.3 cm/s
Leung et al., 2010 [7]	Polyethylene oxide (PEO)	208	N9S = 0.015; N8S = 0.016; N7S = 0.017; N6S= 0.019; N5S = 0.024; N1S = 0.045	QF for 𝑈=5 cm/s was interpolated; N1S had the lowest filtration efficiency and pressure drop, while N9S had the highest filtration efficiency and pressure drop.
Hung and Leung, 2011 [22]	PA 6	94; 185; 185; 185; 185; 220	𝑆 = 0.039; 𝑀1 = 0.037; 𝑀2 = 0.029; 𝑀3 = 0.027; 𝑀4 = 0.022; 𝐿 = 0.022	QF for 𝑈=5 cm/s was interpolated