Filtration of Multi-Walled Carbon Nanotube Aerosol by Fibrous Filters

Figures & data

FIG. 1 Schematic diagram for the preparation of test aerosol of MWCNT.

FIG. 2 Electrical mobility size distribution of generated aerosol with changing concentration of MWCNT-water suspension.

FIG. 3 Typical SEM image of generated polydisperse aerosol.

FIG. 4 The measured length, L_f of individual fibrous particles plotted against corresponding diameter, D_f .

FIG. 5 Scanning electron micrographs of DMA-classified particles with the mobility diameters of (a) 100, (b) 200, and (c) 300 nm.

FIG. 6 Length distribution of DMA-classified MWCNT particles obtained from SEM images. The mobility diameters are (a) 100, (b) 200, and (c) 300 nm.

FIG. 7 Distributions of Heywood diameter of DMA-classified particles. The mobility diameters are (a) 100, (b) 200, and (c) 300 nm.

TABLE 1 Characteristics of DMA-classified MWCNT particles

Dm [nm]	V DMA [V]	Lf [nm]	σg (Lf ) [-]	Df [nm]	σg (Df ) [-]	β[-]	D prj [nm]	σg ( [-]	D* m(calculated) [nm]
100	1628	1100	1.80	54	1.30	20.4	280	1.46	244
200	5021	1300	1.69	57	1.28	22.8	320	1.38	272
300	9066	2100	1.38	57	1.33	36.8	410	1.12	344
*The mobility diameters are predicted by the equation proposed by Kim et al. (2007).

FIG. 8 Experimental set up for measuring filtration efficiency.

FIG. 9 Penetration curves of (a) MWCNT particles and (b) spherical PSL particles through medium performance filter. The solid lines are experimental curves.

FIG. 10 Single fiber capturing efficiencies of fibrous particles with those predicted by interception.

TABLE 2 Orientation angle, θ, obtained by fitting the experimental data

	Orientation angle
U	100 nm	200 nm	300 nm
0.05 m/s	59°	53°	47°
0.1 m/s	53°	52°	44°
0.15 m/s	50°	51°	43°
0.3 m/s	44°	50°	42°
0.5 m/s	44°	46°	40°

Kim , S. H. , Mulholland , G. W. and Zachariah , M. R. 2007 . Understanding Ion-Mobility and Transport Properties of Aerosol Nanowires . J. Aerosol Sci. , 38 : 823 – 842 .

 Web of Science ®Google Scholar