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A miniature disk electrostatic aerosol classifier (mini-disk EAC) for personal nanoparticle sizers.

Authors
Li-L; Chen-DR; Qi-C; Kulkarni-PS
Source
J Aerosol Sci 2009 Nov; 40(11):982-992
NIOSHTIC No.
20036088
Abstract
We have developed a miniature disk electrostatic aerosol classifier (mini-disk EAC) for use in electrical mobility-based personal nanoparticle instrumentation for measurement of personal exposures to nanoaerosols. The prototype consists of two parallel disk electrodes separated by an electrically insulating spacer, to create the particle classification zone. The aerosol enters and exits the classification zone along the bottom disk electrode. An additional, particle-free sheath flow is used to improve the measurement resolution. The transmission measurement of the mini-disk EAC for DMA-classified particles shows that particle losses due to diffusion and electrical image forces were low. The particle penetration at 10 nm diameter (the designed lower size limit for the classifier) was 67% when the prototype was operated at the aerosol and sheath flow rates of 0.5 and 1.0 l min-1, respectively. The performance of the mini-disk EAC was experimentally characterized using the particle cutoff curves that describe their penetration through the classifier as a function of applied voltage across the two disk electrodes. Based on the measurement of particle penetration at different aerosol and sheath flows, it was found that the aerosol and sheath flow rates of 0.5 and 1.5 l min-1 were optimal for classifier operation. Finally, a semi-empirical model was also developed to describe the transfer function of the mini-disk EAC for non-diffusive particles.
Keywords
Analytical-instruments; Aerosols; Monitoring-systems; Exposure-assessment; Nanotechnology; Author Keywords: Miniature mobility classifier; Nanoparticle sizer; Personal aerosol exposure
Contact
Da-RenChen, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, 4676 Columbia Pkwy, MS-R3, Cincinnati, OH 45226, USA
CODEN
JALSB7
Publication Date
20091101
Document Type
Journal Article
Email Address
chen@wustl.edu
Fiscal Year
2010
NTIS Accession No.
NTIS Price
Issue of Publication
11
ISSN
0021-8502
NIOSH Division
DART
Priority Area
Manufacturing
Source Name
Journal of Aerosol Science
State
MO; OH
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