Size distributions of aerosols in an indoor environment with engineered nanoparticle synthesis reactors operating under different scenarios |
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Authors: | Manoranjan Sahu and Pratim Biswas |
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Institution: | (1) Department of Energy, Environmental and Chemical Engineering, Aerosol and Air Quality Research Laboratory, Washington University in St. Louis, Campus Box 1180, St. Louis, MO 63130, USA; |
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Abstract: | Size distributions of nanoparticles in the vicinity of synthesis reactors will provide guidelines for safe operation and protection
of workers. Nanoparticle concentrations and size distributions were measured in a research academic laboratory environment
with two different types of gas-phase synthesis reactors under a variety of operating conditions. The variation of total particle
number concentration and size distribution at different distances from the reactor, off-design state of the fume hood, powder
handling during recovery, and maintenance of reactors are established. Significant increases in number concentration were
observed at all the locations during off-design conditions (i.e., failure of the exhaust system). Clearance of nanoparticles
from the work environment was longer under off-design conditions (20 min) compared to that under normal hood operating conditions
(4–6 min). While lower particle number concentrations are observed during operation of furnace aerosol reactors in comparison
to flame aerosol reactors, the handling, processing, and maintenance operations result in elevated concentrations in the work
area. |
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Keywords: | |
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