Dustiness of 14 carbon nanotubes using the vortex shaker method

Dazon, Claire; Witschger, Olivier; Bau, Sébastien; Payet, Raphaël; Beugnon, Karine; Petit, Geneviève; Garin, Thibaut; Martinon, Laurent

doi:10.1088/1742-6596/838/1/012005

Cited by 5 publications

(5 citation statements)

References 7 publications

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“…12) expressions, respectively. Compared to the VS tests with nano-powders (Dazon et al, 2017;Jensen, 2012), the DIm values for the F220 and 320 powders are around one order magnitude lower.…”

Section: Mass Dustiness Indexmentioning

confidence: 80%

“…the 1 st hour (3455/mg) decreases by 29%, 28%, 5%, 9% and 6% in the progressing 2 nd , 3 rd , 4 th , 5 th and 6 th hour-intervals. Thus, both the micron-scale powders show DIn in the range of 1E+03 to 1E+04, which are typically one to two orders of magnitude lower than the VS dustiness tests using nano-powders for different time durations (Dazon et al, 2017;Jensen, 2012). Furthermore, the increasing trend of DIn (measured by APS and CPC) after 3 hours for SiC F220 is different from the stable profile of DImass (measured by APS, Error!…”

Section: Number Dustiness Indexmentioning

confidence: 87%

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Long-term dust generation from silicon carbide powders

Chakravarty

Fischer

García‐Triñanes

et al. 2018

Process Safety and Environmental Protection

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Most dustiness studies do not measure dust release over long durations, nor do they characterize the effect of dust release on bulk powders. In this study, we tested the dustiness of two different samples of silicon carbide (SiC) powders (referred to as F220 and F320) over six hours using a vortex shaker. Additionally, we characterized the bulk sample for change in shape and size distribution due to the testing. Both powders release respirable fractions of dust particles but differ in their dust generation behavior. The numbers of released respirable particles for powder F220 are more than two times higher than those of powder F320. The dust generation mechanism might include the release of aerosols due to the attrition of particles owing to inter-particle and particle-wall impaction. This study emphasizes the need for long duration dustiness tests for hard materials like SiC and characterization for change in bulk material properties due to dust generation and release. Furthermore, the results can aid in selecting the bulk material for long-term applications based on dustiness.

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Section: Mass Dustiness Indexmentioning

confidence: 80%

Section: Number Dustiness Indexmentioning

confidence: 87%

Long-term dust generation from silicon carbide powders

Chakravarty

Fischer

García‐Triñanes

et al. 2018

Process Safety and Environmental Protection

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“…Mitsui-7 was aerosolized with an acoustic generator, as in other studies with carbon nanotubes [ 28 , 29 ]. The maximum airborne concentration achievable providing stable aerosol characteristics over time depends on the dustiness of the material [ 30 ]; with Mitsui-7, it was 1.5 mg/m 3 .…”

Section: Discussionmentioning

confidence: 99%

Identification of a Gene Signature Predicting (Nano)Particle-Induced Adverse Lung Outcome in Rats

Valentino

Seidel

Lorcin

et al. 2023

IJMS

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Nanoparticles are extensively used in industrial products or as food additives. However, despite their contribution to improving our quality of life, concerns have been raised regarding their potential impact on occupational and public health. To speed up research assessing nanoparticle-related hazards, this study was undertaken to identify early markers of harmful effects on the lungs. Female Sprague Dawley rats were either exposed to crystalline silica DQ-12 with instillation, or to titanium dioxide P25, carbon black Printex-90, or multi-walled carbon nanotube Mitsui-7 with nose-only inhalation. Tissues were collected at three post-exposure time points to assess short- and long-term effects. All particles induced lung inflammation. Histopathological and biochemical analyses revealed phospholipid accumulation, lipoproteinosis, and interstitial thickening with collagen deposition after exposure to DQ-12. Exposure to the highest dose of Printex-90 and Mitsui-7, but not P25, induced some phospholipid accumulation. Comparable histopathological changes were observed following exposure to P25, Printex-90, and Mitsui-7. Comparison of overall gene expression profiles identified 15 potential early markers of adverse lung outcomes induced by spherical particles. With Mitsui-7, a distinct gene expression signature was observed, suggesting that carbon nanotubes trigger different toxicity mechanisms to spherical particles.

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“…Recently, for some CNT powder products, very high dust and individual fiber release propensities have been identified [3,4]. During CNT synthesis and handling, initial processes like product collection and reactor cleaning, as well as secondary processes like CNT powder milling and mixing, product compounding and machining may release airborne CNT or CNT-containing dust particles.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Flexural Rigidity of Multi-Walled Carbon Nanotubes by Dynamic Scanning Electron Microscopy

Fortini

Meyer‐Plath

Kehren

et al. 2020

Fibers

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In this work the flexural rigidity of individual large diameter multi-walled carbon nanotubes (MWCNTs) was investigated. The bending modulus were obtained by detecting the resonance frequencies of mechanically excited cantilevered carbon nanotubes using the so-called dynamic scanning electron microscopy technique, and applying the Euler–Bernoulli beam theory. For the nanotubes studied, we determined a modulus of up to 160 GPa. This agrees with values reported by other authors for MWCNTs produced by catalytic chemical vapor deposition, however, it is 6-8 times smaller than values reported for single and multi-walled carbon nanotubes produced by arc-discharge synthesis. Toxicological studies with carbon nanotubes have been showing that inhaled airborne nanofibers that reach the deep airways of the respiratory system may lead to serious, asbestos-like lung diseases. These studies suggested that their toxicity critically depends on the fiber flexural rigidity, with high rigidity causing cell lesions. To complement the correlation between observed toxicological effects and fiber rigidities, reliable and routinely applicable measurement techniques for the flexural rigidity of nanofibers are required.

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Dustiness of 14 carbon nanotubes using the vortex shaker method

Cited by 5 publications

References 7 publications

Long-term dust generation from silicon carbide powders

Long-term dust generation from silicon carbide powders

Identification of a Gene Signature Predicting (Nano)Particle-Induced Adverse Lung Outcome in Rats

Measurement of Flexural Rigidity of Multi-Walled Carbon Nanotubes by Dynamic Scanning Electron Microscopy

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