Journal
ATMOSPHERIC ENVIRONMENT
Volume 77, Issue -, Pages 385-393Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.atmosenv.2013.05.007
Keywords
Nanoparticle exposure assessment; Nuclepore filter; Capillary tube model; Nanoparticle size distribution
Funding
- NSF [1236107]
- NSF via the MRSEC
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [1236107] Funding Source: National Science Foundation
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Nuclepore filter collection with subsequent electron microscopy analysis for nanoparticles was carried out to examine the feasibility of the method to assess the nanoparticle exposure. The number distribution of nanoparticles collected on the filter surface was counted visually and converted to the distribution in the air using existing filtration models for Nuclepore filters. To search for a proper model, this paper studied the overall penetrations of three different nanoparticles (PSL, Ag and NaCl), covering a wide range of particle sizes (20-800 nm) and densities (1.05-10.5 g cm(-3)), through Nuclepore filters with two different pore diameters (1 and 3 mu m) and different face velocities (2-15 cm s(-1)). The data were compared with existing particle deposition models and modified models proposed by this study, which delivered different results because of different deposition processes considered. It was found that a parameter associated with flow condition and filter geometry (density of fluid medium, particle density, filtration face velocity, filter porosity and pore diameter) should be taken into account to verify the applicability of the models. The data of the overall penetration were in very good agreement with the properly applied models. A good agreement of filter surface collection between the validated model and the SEM analysis was obtained, indicating a correct nanoparticle number distribution in the air can be converted from the Nuclepore filter surface collection and this method can be applied for nanoparticle exposure assessment. (C) 2013 Elsevier Ltd. All rights reserved.
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