Porous polyurethane foam for use as a particle collection substrate in a nanoparticle respiratory deposition sampler

Porous polyurethane foam was evaluated to replace the eight nylon meshes used as a substrate to collect nanoparticles in the Nanoparticle Respiratory Deposition (NRD) sampler. Cylindrical (25 mm diameter by 40 mm deep) foam with 100 pores per inch was housed in a 25-mm-diameter conductive polypropyl...

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Veröffentlicht in:Aerosol science and technology 2016-05, Vol.50 (5), p.497-506
Hauptverfasser: Mines, Levi W. D., Park, Jae Hong, Mudunkotuwa, Imali A., Anthony, T. Renée, Grassian, Vicki H., Peters, Thomas M.
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container_end_page 506
container_issue 5
container_start_page 497
container_title Aerosol science and technology
container_volume 50
creator Mines, Levi W. D.
Park, Jae Hong
Mudunkotuwa, Imali A.
Anthony, T. Renée
Grassian, Vicki H.
Peters, Thomas M.
description Porous polyurethane foam was evaluated to replace the eight nylon meshes used as a substrate to collect nanoparticles in the Nanoparticle Respiratory Deposition (NRD) sampler. Cylindrical (25 mm diameter by 40 mm deep) foam with 100 pores per inch was housed in a 25-mm-diameter conductive polypropylene cassette cowl compatible with the NRD sampler. Pristine foam and nylon meshes were evaluated for metals content via elemental analysis. The size-selective collection efficiency of the foam was evaluated using salt (NaCl) and metal fume aerosols in independent tests. Collection efficiencies were compared to the nanoparticulate matter (NPM) criterion and a semi-empirical model for foam. Changes in collection efficiency and pressure drop of the foam and nylon meshes were measured after loading with metal fume particles as measures of substrate performance. Substantially less titanium was found in the foam (0.173 µg sampler −1 ) compared to the nylon mesh (125 µg sampler −1 ), improving the detection capabilities of the NRD sampler for titanium dioxide particles. The foam collection efficiency was similar to that of the nylon meshes and the NPM criterion (R 2 = 0.98, for NaCl), although the semi-empirical model underestimated the experimental efficiency (R 2 = 0.38). The pressure drop across the foam was 8% that of the nylon meshes when pristine and changed minimally with metal fume loading (∼19 mg). In contrast, the pores of the nylon meshes clogged after loading with ∼1 mg metal fume. These results indicate that foam is a suitable substrate to collect metal (except for cadmium) nanoparticles in the NRD sampler. Copyright © 2016 American Association for Aerosol Research
doi_str_mv 10.1080/02786826.2016.1164828
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source Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; Free Full-Text Journals in Chemistry
subjects Aerosols
Collection
Efficiency
Finite element method
Foamed metals
Fumes
Nanoparticles
Nylons
Plastic foam
Polyurethane
Samplers
Substrates
Takafumi Seto
title Porous polyurethane foam for use as a particle collection substrate in a nanoparticle respiratory deposition sampler
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