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Design optimization of a portable thermophoretic precipitator nanoparticle sampler.

Authors
Miller-A; Marinos-A; Wendel-C; King-G; Bugarski-A
Source
Aerosol Sci Tech 2012 Aug; 46(8):897-904
NIOSHTIC No.
20040891
Abstract
Researchers at the National Institute for Occupational Safety and Health (NIOSH) are developing methods for characterizing diesel particulate matter in mines. Introduction of novel engine and exhaust aftertreatment technologies in underground mines is changing the nature of diesel emissions, and metrics alternative to the traditional mass-based measurements are being investigated with respect to their ability to capture changes in the properties of diesel aerosols. The emphasis is given to metrics based on measurement of number and surface area concentrations, but analysis of collected particles using electron microscopy (EM) is also employed for detailed particle characterization. To collect samples for EM analysis at remote workplaces, including mining and manufacturing facilities, NIOSH is developing portable particle samplers capable of collecting airborne nano-scale particles. This paper describes the design, construction, and testing of a prototype thermophoretic precipitator (TP) particle sampler optimized for collection of particles in the size range of 1-300 nm. The device comprises heated and cooled metal plates separated by a 0.8 mm channel through which aerosol is drawn by a pump. It weighs about 2 kg, has a total footprint of 27 22 cm, and the collection plate size is approximately 4 8 cm. Low power consumption and enhanced portability were achieved by using moderate flow rates (50-150 cm3/min) and temperature gradients (10-50 K/mm with ?T between 8 K and 40 K). The collection efficiency of the prototype, measured with a condensation particle counter using laboratory-generated polydisperse submicrometer NaCl aerosols, ranged from 14-99%, depending on temperature gradient and flow rate. Analysis of transmission electron microscopy images of samples collected with the TP confirmed that the size distributions of collected particles determined using EM are in good agreement with those determined using a Fast Mobility Particle Sizer.
Keywords
Nanotechnology; Samplers; Sampling-equipment; Sampling-methods; Diesel-emissions; Diesel-exhausts; Particulates; Particulate-dust; Underground-mining; Mining-industry; Aerosol-sampling; Aerosol-particles; Aerosols; Exposure-assessment
Contact
Art Miller, National Institute for Occupational Safety and Health, Spokane Research Lab, 315 E. Montgomery Ave, Spokane, WA 99207, USA
CODEN
ASTYDQ
Publication Date
20120801
Document Type
Journal Article
Email Address
ALMiller@cdc.gov
Fiscal Year
2012
NTIS Accession No.
NTIS Price
Identifying No.
B06202012
Issue of Publication
8
ISSN
0278-6826
NIOSH Division
OMSHR
Priority Area
Mining
Source Name
Aerosol Science and Technology
State
WA; PA
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