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Modeling the size distribution in a fluidized bed of nanopowder
- Source :
- Environmental Science: Nano. 4:670-678
- Publication Year :
- 2017
- Publisher :
- Royal Society of Chemistry (RSC), 2017.
-
Abstract
- The release of nanosized particles from fluidized beds of ceramic oxide nanopowders, namely, TiO2 (P25), Al2O3 (AluC) and SiO2 (A130) has been assessed for the first time. Previous models and experiments for processing engineered nanoparticles (ENP) using fluidized beds reported only the formation of micron-sized cluster agglomerates in the gas phase. In this work, aerosol spectrometry techniques such as scanning mobility particle sizing (SMPS) and optical particle counting (OPC) have been combined with powder technologies, such as the borescope high-speed camera system, to determine the particle size distribution from 5 nm to 1 mm above a fluidized bed. Furthermore, the morphology of nanoparticulate aerosol at different locations in the bed was determined by offline electron microscopy. The results demonstrate that free nano- and micron-sized particles are released from fluidized beds. Since the structures found above the bed are also expected to be present within fluidized beds, a revision of existing nanoparticle fluidization models, and improved safety and control measures in reactors for gas-phase ENP processing are needed to avoid nanoparticle release.
- Subjects :
- Materials science
Chromatography
Materials Science (miscellaneous)
Nanoparticle
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
0104 chemical sciences
Aerosol
Chemical engineering
13. Climate action
Fluidized bed
Agglomerate
visual_art
Particle-size distribution
visual_art.visual_art_medium
Particle
Ceramic
Fluidization
0210 nano-technology
General Environmental Science
Subjects
Details
- ISSN :
- 20518161 and 20518153
- Volume :
- 4
- Database :
- OpenAIRE
- Journal :
- Environmental Science: Nano
- Accession number :
- edsair.doi...........760abdef153512f45e2d960f5d5c3174