Investigation of airborne nanopowder agglomerate stability in an orifice under various differential pressure conditions

@article{Stahlmecke2009InvestigationOA,
  title={Investigation of airborne nanopowder agglomerate stability in an orifice under various differential pressure conditions},
  author={Burkhard Stahlmecke and Sandra Wagener and Christof Asbach and Heinz Kaminski and Heinz Fissan and Thomas A J Kuhlbusch},
  journal={Journal of Nanoparticle Research},
  year={2009},
  volume={11},
  pages={1625-1635}
}
The stability of agglomerates is not only an important material parameter of powders but also of interest for estimating the particle size upon accidental release into the atmosphere. This is especially important when the size of primary particles is well below the agglomerate size, which is usually the case when the size of primary particles is below 100 nm. During production or airborne transportation in pipes, high particle concentrations lead to particle coagulation and the formation of… Expand
A system to assess the stability of airborne nanoparticle agglomerates under aerodynamic shear
Abstract Stability of airborne nanoparticle agglomerates is important for occupational exposure and risk assessment in determining particle size distribution of nanomaterials. In this study, weExpand
De-agglomeration of nanoparticles in a jet impactor-assisted fluidized bed
Abstract Nanoparticles in agglomerated state lose their outstanding properties; hence, it is essential to break them up prior to use and prevent their re-agglomeration. Even though there are severalExpand
Titre : Title : De-agglomeration of nanoparticles in a jet impactor-assisted fluidized bed Auteurs :
8 Nanoparticles in agglomerated state lose their outstanding properties; hence, it is essential to break them 9 up prior to use and prevent the re-agglomeration. Even though there are several dryExpand
Deagglomeration testing of airborne nanoparticle agglomerates: Stability analysis under varied aerodynamic shear and relative humidity conditions
ABSTRACT Occupational exposure to nanomaterial aerosols poses potential health risks to workers at nanotechnology workplaces. Understanding the mechanical stability of airborne nanoparticleExpand
Effect of particle agglomeration in nanotoxicology
TLDR
The topic of this review is the role of agglomeration on toxicity, including the fate of nanomaterials after their release and the biological effects they may induce, and ENP uptake and intracellular distribution. Expand
Minimum pickup velocity – the transition between nano-scale and micro-scale
The transport of nano-scale particles has become increasingly important, but the knowledge base available is limited. This study aims to bridge the knowledge gap between the nano- and micro-scalesExpand
Minimum pickup velocity (Upu) of nanoparticles in gas–solid pneumatic conveying
This paper is the first systematic study of the pneumatic conveying of nanoparticles. The minimum pickup velocity, Upu, of six nanoparticle species of different materials [i.e., silicon dioxideExpand
Complex Aerosol Characterization by Scanning Electron Microscopy Coupled with Energy Dispersive X-ray Spectroscopy
TLDR
The SEM/EDS analysis provides a more detailed physicochemical characterization of PM than online measurements, and has the potential to improve assessments of PM exposure and risk, and facilitates source identification, even without prior knowledge at sampling. Expand
Dustiness and Deagglomeration Testing: Interlaboratory Comparison of Systems for Nanoparticle Powders
Different types of aerosolization and deagglomeration testing systems exist for studying the properties of nanomaterial powders and their aerosols. However, results are dependent on the specificExpand
The Effect of Oxygen Precursor Concentration to the Iron Oxide Nanoparticles Properties for Lateral Flow Immunoassay Application
In this study, the influence of hydrogen peroxide (H2O2) concentration to the iron oxide nanoparticles (IONPs) properties prepared using the precipitation method was investigated. The H2O2Expand
...
1
2
3
4
...

References

SHOWING 1-10 OF 27 REFERENCES
Impact Fragmentation of Metal Nanoparticle Agglomerates
Deagglomeration experiments were performed with agglomerates of nanoparticles of Ni and Pt. The fragmentation was induced by high velocity impaction of the agglomerates in a single-stage low pressureExpand
Impact fragmentation of nanoparticle agglomerates
Abstract A method of fragmenting nanoparticle agglomerates by impaction from the aerosol phase in a single-stage impactor is described. The degree of fragmentation as a function of impaction velocityExpand
Particle loss in a critical orifice
Abstract Particle deposition in different regions of a critical orifice assembly was studied numerically and experimentally. The investigated orifice is an O’Keefe E-9 (O’Keefe Control Co.) orificeExpand
New apparatus for studying powder deagglomeration
Abstract A new apparatus for studying deagglomeration of powders is presented. In many powder technology applications, it is important to know how strongly particles are adhered to each other and toExpand
Gas-Phase Synthesis of Non-Agglomerated Nanoparticles by Fast Gasdynamic Heating and Cooling
A novel method for the production of oxide nanoparticles from gas-phase organic precursors in a high-velocity flow apparatus is described. In contrast to conventional methods of reaction initiationExpand
Nanomaterials as Flow Regulators in Dry Powders
Abstract From a physical point of view powders represent an intermediary state between solids and fluids. This holds especially with respect to their flow properties. Gravitational forces as well asExpand
Numerical simulation of the impact fracture and fragmentation of agglomerates
Computer simulations of agglomerates impacting a wall have been carried out using the distinct element method. The agglomerates comprised 1000 primary particles in a two-dimensional array.Expand
Particles synthesis in erosive laser plasma in a high pressure atmosphere
Synthesis of ultrafine particles as a result of condensation in an erosive jet at laser vaporization of materials (metals, metal oxides, carbon) in gases (hydrogen, oxygen, helium, argon, xenon andExpand
Resuspension of Particles by Aerodynamic Deagglomeration
A deagglomerator system was developed, characterized by laboratory tests, and flown under low-gravity (low-g) microgravity conditions. Requirements for a dry powder deagglomeration system wereExpand
Capillary forces between two spheres with a fixed volume liquid bridge: theory and experiment.
Capillary forces are commonly encountered in nature because of the spontaneous condensation of liquid from surrounding vapor, leading to the formation of a liquid bridge. In most cases, the advent ofExpand
...
1
2
3
...