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1. Nanoparticle characterization
1.1 Definitions
An aerosol is defined as a suspension in a gas (usually air) of solid or liquid particles with negligible falling velocity. In air and under near-ambient conditions (20°C and 101 kPa), this corresponds to particles smaller than around 100 µm.
Some aerosols may be composed of ultrafine particles (UFP) or nanoparticles characterized by their three external dimensions of less than 100 nm. Because of their small size and high concentration, nanoparticles have a strong tendency to agglomerate, forming agglomerates or aggregates of nanometric particles, like soot particles or welding fumes.
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Nanoparticle characterization
Fiber filter separation
Bibliography
Standards and norms
- Appareils de protection respiratoire ; Demi-masques filtrants contre les particules : Exigences, essais, marquage - NF EN 149+A1 - 2009
- Respiratory protection devices – Recommendations for selection, use, care and maintenance – Guide. - NF EN 529 - 2006
- Respiratory protection devices – Compressed gases for self-contained breathing apparatus. - NF EN 12021 - 2014
- Filtres à air à haute efficacité...
Regulations
Nanomaterials – Definitions, toxicological risks, characterization of occupational exposure and prevention measures, ED 6050, INRS, Paris, September 2012, 48 p.
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French Society for Fluid-Particle Separations (SF2P)
French Aerosol Research and Study Association (ASFERA)
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