Nanoparticle collection efficiency of capillary pore membrane filters.
Cyrs-WD; Boysen-DA; Gasuccio-G; Lersch-T; Peters-TM
J Aerosol Sci 2010 Jul; 41(7):655-664
The surface and overall collection efficiencies of capillary pore membrane filters were measured for sub-micrometer particles. Collection efficiencies were derived from the surface loadings of particles on filters measured by scanning electron microscopy and from airborne particle concentrations measured with a scanning mobility particle sizer. Tests used filters with nominal pore diameters of 0.4 and 0.8 mm and face velocities of 3.7 and 18.4cm/s. Surface collection efficiencies were below 100% for particles smaller than 316nm and below 55% for particles smaller than 100nm. Over all collection efficiencies reached a slow as 45% for 70nm particles. For nanoparticles, collection efficiencies over all were substantially higher than those to the filter surface, indicating that deposition occurs to a large extent inside the filter pores. These results underscore the need to account for surface collection efficiency when deriving airborne concentrations from microscopic analysis of nanoparticles on capillary pore membrane filters.
Filters; Particulates; Airborne-particles; Nanotechnology; Microscopy; Analytical-processes;
Author Keywords: Nanoparticle; Filter; Efficiency; Air sampling
W.D. Cyrs, The University of Iowa,100 Oakdale Campus,121 IREH, Iowa City, IA 52242
Journal of Aerosol Science
University of Iowa