Deagglomeration testing of airborne nanoparticle agglomerates: stability analysis under varied aerodynamic shear and relative humidity conditions

Détails

Ressource 1Télécharger: BIB_E369F912E8B8.P001.pdf (1131.64 [Ko])
Etat: Public
Version: Author's accepted manuscript
ID Serval
serval:BIB_E369F912E8B8
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Deagglomeration testing of airborne nanoparticle agglomerates: stability analysis under varied aerodynamic shear and relative humidity conditions
Périodique
Aerosol Science and Technology
Auteur(s)
Ding Yaobo, Stahlmecke Burkhard, Kaminski Heinz, Jiang Yunhong, Kuhlbusch Thomas A.J., Riediker Michael
ISSN
0278-6826 (Print)
1521-7388 (Electronic)
Statut éditorial
Publié
Date de publication
11/2016
Peer-reviewed
Oui
Volume
50
Numéro
11
Pages
1253-1263
Langue
anglais
Résumé
Occupational exposure to nanomaterial aerosols poses potential health risks to workers at nanotechnology workplaces. Understanding the mechanical stability of airborne nanoparticle agglomerates under varied mechanical forces and environmental conditions is important for estimating their emission potential and the released particle size distributions which in consequence alters their transport and human uptake probability. In this study, two aerosolization and deagglomeration systems were used to investigate the potential for deagglomeration of nanopowder aerosols with different surface hydrophilicity under a range of shear forces and relative humidity conditions. Critical orifices were employed to subject airborne agglomerates to the shear forces induced by a pressure drop. Increasing applied pressure drop were found to be associated with decreased mean particle size and increased particle number concentrations.
Rising humidity decreased the deagglomeration tendency as expressed by larger modal particle sizes and lower number concentrations compared to dry conditions. Hydrophilic aerosols exhibited higher sensitivities to changes in humidity than hydrophobic particles. However, the test systems themselves also differed in generated particle number concentrations and size distributions, which in turn altered the responses of created aerosols to humidity changes. The results of the present study clearly demonstrate that a) humidity control is essential for dustiness and deagglomeration testing, b) that (industrial) deagglomeration, e.g. for preparation of aerosol suspensions, can be manipulated by subjecting airborne particles to external energies, and c) that the humidity of workplace air may be relevant when assessing occupational exposure to nanomaterial aerosols.
Mots-clé
Aerosols, Nanoparticles/analysis, Particle Size, Humidity
Web of science
Open Access
Oui
Création de la notice
14/11/2016 12:33
Dernière modification de la notice
20/08/2019 17:07
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