Separation of gas-borne nanoparticles in bubble columns

Koch, Dagmar; Weber, Alfred P.

doi:10.1016/j.jaerosci.2012.05.012

Cited by 24 publications

(16 citation statements)

References 33 publications

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“…Although the main parameters (bubble size and rising velocity) used in the model of Pich and Schütz (1991) are estimate in the present work using correlations, we will see that data obtained on the collection efficiency of aerosol particles for different heights of water are close to theoretical results. This good agreement between the model and the scrubbing efficiency of bubble columns has previously been observed (Cadavid-Rodriguez et al, 2014) yet at a laboratory scale and for ultrafine particles (Koch and Weber, 2012).…”

Section: Introductionsupporting

confidence: 85%

“…One hypothesis is that the slight discrepancies observed in Tables 2 and 3 between the model and the data come from the sub-micron mode (d p > 200 nm) present in the particle mass size distributions gathered in Fig. 10 and for which the model of Pich and Schütz (1991) is less adequate (Koch and Weber, 2012).…”

Section: Experimental Collection Efficiencymentioning

confidence: 93%

“…The main mechanism involved in the collection of the particles during the cuts made under water is the collection of particles by bubbles created while cutting. Collection of ultrafine particles is done in the liquid phase and depends on the size of the bubbles, their rising velocity in the water column and the nature of the trapping liquid (Charvet et al, 2011;Koch and Weber, 2012).…”

Section: Particle Collection Efficiency Of the Water Columnmentioning

confidence: 99%

See 2 more Smart Citations

Aerosol Characterization and Particle Scrubbing Efficiency of Underwater Operations during Laser Cutting of Steel Components for Dismantling of Nuclear Facilities

Peillon

Fauvel

Chagnot

et al. 2017

Aerosol Air Qual. Res.

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The goal of this article is to provide results on aerosol particles emissions of a laser Nd:YAG cutting technique used for the decommissioning of nuclear facilities. In particular, the study aims at characterizing the aerosol emitted during the cutting of steel specimens of different thicknesses and to study particulate emissions for cuts in air and under water. To do so, we calculate the emitted aerosol mass per unit area of cut. Overall, it was found that the mass of aerosol per unit area of cut by laser cutting decreases when the laser power and cutting speed increase. We also examine the performance of the height of the water column above the cut on the particle collection efficiency. We found that the driving phenomenon for particle collection is the scrubbing of particles by bubbles present in the water column. When cuts are realized under water, the production of aerosol particles mass per unit area of cut is reduced by a factor of 10 and limited below 70 g m -2 .

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Section: Introductionsupporting

confidence: 85%

Section: Experimental Collection Efficiencymentioning

confidence: 93%

Section: Particle Collection Efficiency Of the Water Columnmentioning

confidence: 99%

See 1 more Smart Citation

Aerosol Characterization and Particle Scrubbing Efficiency of Underwater Operations during Laser Cutting of Steel Components for Dismantling of Nuclear Facilities

Peillon

Fauvel

Chagnot

et al. 2017

Aerosol Air Qual. Res.

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show abstract

“…It can be seen that the particle loss is significantly affected by the particle size. The measured particle loss in the GMA saturator agrees with the prediction of the Fuchs model (Fuchs 1964;Koch and Weber 2012). According to the Fuchs model, the separation efficiency in the gas bubbles increase monotonically with the particle diffusion coefficient.…”

Section: Determination Of Particle Loss In the Polymersupporting

confidence: 81%

“…Such significant particle losses are known from nanoparticle separation studies performed in bubble columns. It was recently shown that the separation efficiency of nanoparticles in rising bubbles due to Brownian motion depends on bubble size and particle diameter, as well as on bubble velocity and residence time (Koch and Weber 2012). However, since these quantities were not determined for the present system, the found particle losses in the saturator cannot be compared quantitatively to the model predictions.…”

Section: Monomer Condensationmentioning

confidence: 84%

Aerosol Process for theIn SituCoating of Nanoparticles with a Polymer Shell

Poostforooshan

Rennecke

Gensch

et al. 2014

Aerosol Science and Technology

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This article presents a novel method to encapsulate gas-borne nanoparticles with a polymeric shell. This method implies heterogeneous condensation of monomer vapor around the surface of nanoparticles as nuclei and polymerization is then subsequently started by addition of NH 3 as aerosol initiator. Ag and SiO 2 nanoparticles were generated as inorganic core by spark discharge and nebulization, respectively, and glycidyl methacrylate (GMA) was used as organic monomer. The effect of several parameters, including vapor pressure of monomer and properties of inorganic core such as morphology, material, particle size, and production method on the thickness of polymeric shell and morphology of resulting nanocomposites has been investigated. The particle size distribution and morphology of the resulting core-shell nanoparticles have been studied via scanning mobility particle sizer (SMPS) and transmission electron microscope (TEM). Finally, the coating efficiency was determined by aerosol photoemission (APE) and the results show that monomer and polymer coating efficiency are 99% and 60%, respectively.

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Stable Nanosuspensions via the Deposition of Gas‐Borne Nanoparticles of Active Pharmaceutical Ingredients in Bubble Columns

Koch

Weber

2014

Chemie Ingenieur Technik

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Der Transport von Partikeln aus der Gasphase in eine Flüssigkeit in Blasensäulen kann zur Herstellung stabiler Nanosuspensionen aus pharmazeutischen Wirkstoffen eingesetzt werden. In der vorliegenden Arbeit wird das Verhalten gasgetragener Nanopartikel (Kohlenstoff und Phytosterol) beim Übergang aus aufsteigenden Gasblasen in die Suspensionsflüssigkeit für Wasser und zwei Stabilisatorlösungen (Polyvinylpyrrolidon K25 und Tween®80) untersucht. Neben einem Modell zur Beschreibung der Abscheideeffizienz wird auch die Langzeitstabilität der Phytosterol‐Suspensionen diskutiert.

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Separation of gas-borne nanoparticles in bubble columns

Cited by 24 publications

References 33 publications

Aerosol Characterization and Particle Scrubbing Efficiency of Underwater Operations during Laser Cutting of Steel Components for Dismantling of Nuclear Facilities

Aerosol Characterization and Particle Scrubbing Efficiency of Underwater Operations during Laser Cutting of Steel Components for Dismantling of Nuclear Facilities

Aerosol Process for theIn SituCoating of Nanoparticles with a Polymer Shell

Stable Nanosuspensions via the Deposition of Gas‐Borne Nanoparticles of Active Pharmaceutical Ingredients in Bubble Columns

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