A novel-charged fibrous media characterized by higher efficiency and lower pressure drop

Figures & data

Table 1. Manufacturing parameters of fiber.

Fiber type	Smooth	Notch
Concentration (wt %)	18 (PMMA)	Core	5 (PEO)
		Shell	22 (PS)
Feed rate (ml/h)	2	Core	0.2 (PEO)
		Shell	1.8 (PS)
Inner size of needle (mm)	0.42	Core	0.17
		Shell	1.17
Collection time (min)	5–9–12	8–12–16
Ambient humidity (%)	25–30	40–45

Figure 1. Schematic diagram of electrospinning elements.

Figure 2. Distribution of particles input of filter.

Figure 3. Schematic diagram of filtration and measurement.

Figure 4. SEM image of smooth fibers.

Figure 5. Notched fibers (a) SEM, and (b) pore distribution.

Table 2. Property table of smooth fiber filter with diameter of 2.44 µm.

Type	Item	Thickness (mm)	Packing density (%)
Smooth	Group 1	0.102 ± 0.005	5.93
Smooth	Group 2	0.135 ± 0.012	5.97
Smooth	Group 3	0.187 ± 0.021	6.04

Table 3. Property table of notched-fiber filter with diameter of 2.59 µm.

Type	Item	Thickness (mm)	Packing density (%)
Notch	Group 1	0.100 ± 0.004	4.87
Notch	Group 2	0.136 ± 0.010	4.74
Notch	Group 3	0.188 ± 0.010	4.95

Figure 6. The pressure drop of filters at thicknesses of (a) 0.1 mm, (b) 0.14 mm, and (c) 0.19 mm.

Table 4. The surface potential of 0.19 mm filter thickness.

Fiber type	Surface potential (kV)	Surface charge density (µC m^−2)
Smooth	−0.82 ± 0.103	−38.2
Notch	−1.10 ± 0.112	−51.2

Figure 7. Penetration of uncharged filters (a) 0.1 mm, (b) 0.14 mm, and (c) 0.19 mm.

Figure 8. Penetration rate of charged filters (a) 0.1 mm, (b) 0.14 mm, and (c) 0.19 mm.

Table 5. The most penetrating particle size (MPPS) offset table for notched porous fibers (units: nm).

Filter thickness	Notch
	Uncharged	Charged (−)
0.1 mm	250.30	278.80
0.14 mm	289.20	201.70
0.19 mm	299.60	269.00

Figure 9. Filtration quality of filters: (a) average quality factor of uncharged filters; (b) average quality factor of Charged filters.

Figure 10. Average quality factor of filters of different thicknesses.