Measurement of multi-wall carbon nanotube penetration through a screen filter and single-fiber analysis |
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Authors: | Jing Wang Seong Chan Kim David Y H Pui |
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Institution: | 1.ETH Zurich, Institute of Environmental Engineering,Zurich,Switzerland;2.Empa, Analytical Chemistry,Dübendorf,Switzerland;3.Particle Technology Laboratory, Department of Mechanical Engineering,University of Minnesota,Minneapolis,USA |
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Abstract: | In this study, we carried out experiments to study penetration of airborne carbon nanotubes (CNTs) through a screen filter.
An electrospray system was employed to aerosolize suspensions of multi-wall CNTs. The generated airborne CNTs were characterized
by electron microscopy, and the length and diameter were measured. In the filtration experiments, the challenging CNTs are
classified by a differential mobility analyzer. Monodisperse CNTs with the same electrical mobility were then employed to
challenge the screen filter. Penetration was measured for CNTs in the range of 100–400 nm mobility diameters. The results
showed that the CNT penetration was less than the penetration for a sphere with the same mobility diameter, which was mainly
due to the larger interception length of the CNTs. We compared the modeling results using single-fiber filtration efficiency
theories with the experimental data, and found that the effective interception length can be approximated by the CNT aerodynamic
diameter multiplying a scaling factor. A hypothesis is proposed to understand the observation. |
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