Journal
JOURNAL OF NANOPARTICLE RESEARCH
Volume 13, Issue 10, Pages 4565-4573Publisher
SPRINGER
DOI: 10.1007/s11051-011-0415-y
Keywords
Emission controls; Filtration; Control technology; Pollution control equipment; Environmental and health implications
Categories
Funding
- NSF [1056479]
- Center for Filtration Research: 3M Corporation
- Boeing Company
- Cummins Filtration Inc.
- Donaldson Company Inc.
- Entegris Inc
- Hollingsworth Vose Company
- Samsung Semiconductor Inc.
- Shigematsu Works CO., LTD
- TSI Inc.
- W. L. Gore Associates
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1056479] Funding Source: National Science Foundation
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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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