Dust generation in powders: Effect of particle size distribution

Chakravarty, Somik; Bihan, Olivier Le; Fischer, Marc; Morgeneyer, Martin

doi:10.1051/epjconf/201714013018

Cited by 10 publications

(7 citation statements)

References 11 publications

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“…The dustiness level and characteristics of dust release from a powder material depends on their characteristics and properties (e.g., density, particle size distribution, moisture content, and extent of aggregation and agglomeration [ 35 , 82 , 83 , 84 , 85 , 86 , 87 , 88 , 89 , 90 ]). Additionally, storage conditions can play a role in the dustiness.…”

Section: Discussionmentioning

confidence: 99%

Occupational Exposure and Environmental Release: The Case Study of Pouring TiO2 and Filler Materials for Paint Production

Fonseca

Viitanen

Kanerva

et al. 2021

IJERPH

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Pulmonary exposure to micro- and nanoscaled particles has been widely linked to adverse health effects and high concentrations of respirable particles are expected to occur within and around many industrial settings. In this study, a field-measurement campaign was performed at an industrial manufacturer, during the production of paints. Spatial and personal measurements were conducted and results were used to estimate the mass flows in the facility and the airborne particle release to the outdoor environment. Airborne particle number concentration (1 × 103–1.0 × 104 cm−3), respirable mass (0.06–0.6 mg m−3), and PM10 (0.3–6.5 mg m−3) were measured during pouring activities. In overall; emissions from pouring activities were found to be dominated by coarser particles >300 nm. Even though the raw materials were not identified as nanomaterials by the manufacturers, handling of TiO2 and clays resulted in release of nanometric particles to both workplace air and outdoor environment, which was confirmed by TEM analysis of indoor and stack emission samples. During the measurement period, none of the existing exposure limits in force were exceeded. Particle release to the outdoor environment varied from 6 to 20 g ton−1 at concentrations between 0.6 and 9.7 mg m−3 of total suspended dust depending on the powder. The estimated release of TiO2 to outdoors was 0.9 kg per year. Particle release to the environment is not expected to cause any major impact due to atmospheric dilution

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Section: Discussionmentioning

confidence: 99%

Occupational Exposure and Environmental Release: The Case Study of Pouring TiO2 and Filler Materials for Paint Production

Fonseca

Viitanen

Kanerva

et al. 2021

IJERPH

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“…The vortex shaker (VS) method (Chakravarty et al, 2017a(Chakravarty et al, , 2017bLe Bihan et al, 2014;Morgeneyer et al, 2013) is a promising dust generation method which is capable of functioning with very small sample quantities (less than 4g). (Morgeneyer et al, 2013) and (Le Bihan et al, 2014) used the VS method to test dust generation of micron-sized alumina particles and nanoscale carbon nano-tubes (CNTs) for one hour with sample mass as small as 0.5 g, respectively.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…The VS setup was used as the dustiness tester due to its low requirements of sample sizes, ease of operation and the ability to retain the powder sample after the test. The experimental setup used by (Chakravarty et al, 2017b;Jensen, 2012) was adopted for the present study. The setup broadly consists of 4 sections; generation, sampling, dilution, and measurement (Error!…”

Section: A C C E P T E Dmentioning

confidence: 99%

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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“…It can be employed in the field of occupational hygiene and consumer exposure assessment since the TEM grid is directly ready for TEM analysis once sampled (R'mili et al 2013) and just a few minutes of sampling is required. Researches on nanoparticle exposure assessment (Bressot et al 2018b;Fonseca et al 2018;Morgeneyer, Aguerre-Chariol and Bressot 2018;Zhao and Zhang 2019) and powder structure characterization (Bourrous et al 2018;Chakravarty et al 2017;Le Bihan et al 2016) have validated the applicability of the MPS.…”

Section: Introductionmentioning

confidence: 99%

Airborne nanoparticle collection efficiency of a TEM grid-equipped sampling system

Xiang

Morgeneyer

Aguerre-Chariol

et al. 2021

Aerosol Science and Technology

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The recently developed aerosol sampler called mini particle sampler (MPS), which is equipped with a porous Transmission electron microscopy (TEM) grid, renders nanoparticle sampling convenient. The present study aims to improve the nanoparticle sampling efficiency and to optimize the sampling technology. The sensitivity of the parameters in the whole set-up is estimated by the Taguchi method. The effects of the main parameters on the collection efficiency are 2 compared between experiments and theories. The sampling efficiencies are determined for particles with mobility diameters ranging from 5 to 100 nm. The results show that parameters: salt concentration of the atomizer, high-voltage polarity in the differential mobility analyzer (DMA), sampling efficiency assessment method, sampling temperature, and porosity of the porous TEM grid minimally affect the collection efficiency. Small filter pore size and high flowrate promote particle capturing, but may aggravate the burden on the TEM grid. Denser particles increase the deposition possibility due to impaction, and thereby increasing the overall collection efficiency. The minimum collection efficiency is up to 40% by adjusting the parameter settings of the sampling system. The results are of immediate importance for assessing nano-exposure using the MPS sampling system.

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Dust generation in powders: Effect of particle size distribution

Cited by 10 publications

References 11 publications

Occupational Exposure and Environmental Release: The Case Study of Pouring TiO2 and Filler Materials for Paint Production

Occupational Exposure and Environmental Release: The Case Study of Pouring TiO2 and Filler Materials for Paint Production

Long-term dust generation from silicon carbide powders

Airborne nanoparticle collection efficiency of a TEM grid-equipped sampling system

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