Filtration of nanoparticles applied in general ventilation

Brochot, Clothilde; Abdolghader, Pooya; Haghighat, Fariborz; Bahloul, Ali

doi:10.1080/23744731.2018.1500396

Cited by 16 publications

(8 citation statements)

References 58 publications

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“…The minimum collection efficiency, which is also referred to as the most penetrating particle size (MPPS), is obtained for the 100-300 nm size range. However, some studies showed that the MPPS for QFF may peak around 60 nm and are possibly < 100 nm for other fibrous media (Brochot et al, 2019;Zíková et al, 2015). While this measured values are mostly influenced by both the flow velocity in the sampling line and the pressure drop at the surface of the filter, our flow conditions are close to those used in the work of Zíková et al (2015).…”

Section: Sample Collectionsupporting

confidence: 55%

“…99-166 nm modal diameter, Bescond et al, 2016). Filter collection efficiency is directly related to inertial impaction, direct interception, Brownian diffusion and electrostatic forces (Brochot et al, 2019;Lindsley, 2016;Zíková et al, 2015). The resulting component of these forces is translated into a function that displays near 100 % collection efficiency for particles smaller than 20 nm and larger than 300 nm.…”

Section: Sample Collectionmentioning

confidence: 99%

See 1 more Smart Citation

Chemical discrimination of the particulate and gas phases of miniCAST exhausts using a two-filter collection method

Ngo¹,

Duca²,

Carpentier³

et al. 2019

Preprint

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Abstract. Combustion of hydrocarbons produces both particulate and gas phase emissions responsible for major impacts on atmospheric chemistry and human health. Ascertaining the impact of these emissions, especially on human health, is not straightforward because of our relatively poor knowledge of how chemical compounds are partitioned between the particle and gas phases. Accordingly, we propose to couple a two-filter sampling method with a multi-technique analytical approach to fully characterize the particulate and gas phase compositions of combustion by-products. The two-filter sampling method is designed to retain particulate matter (elemental carbon possibly covered in a surface layer of adsorbed molecules) on a first quartz fiber filter while letting the gas phase pass through, and then trap the most volatile components on a second black carbon-covered filter. All samples thus collected are subsequently subjected to a multi-technique analytical protocol involving two-step laser mass spectrometry (L2MS), secondary ion mass spectrometry (SIMS), and micro-Raman spectroscopy. Using the combination of this two-filter sampling/multi-technique approach in conjunction with advanced statistical methods we are able to unravel distinct surface chemical compositions of aerosols generated with different set points of a miniCAST burner. Specifically, we successfully discriminate samples by their volatile, semi-volatile and non-volatile polycyclic aromatic hydrocarbon (PAH) contents and reveal how subtle changes in combustion parameters affect particle surface chemistry.

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Section: Sample Collectionsupporting

confidence: 55%

Section: Sample Collectionmentioning

confidence: 99%

Chemical discrimination of the particulate and gas phases of miniCAST exhausts using a two-filter collection method

Ngo¹,

Duca²,

Carpentier³

et al. 2019

Preprint

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show abstract

“…These mechanisms are associated to the ‘mechanical’ filtration. The most penetrating particle size (MPPS) is then located around 300 nm ( Baron and Willeke, 2001 ; Brochot et al , 2019 ).…”

Section: Introductionmentioning

confidence: 99%

How Effective Is the Filtration of ‘KN95’ Filtering Facepiece Respirators During the COVID-19 Pandemic?

Brochot

Saidi

Bahloul

2020

Annals of Work Exposures and Health

Self Cite

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Objectives The high demand of filtering facepiece respirators (FFRs) worldwide during the period of the COVID-19 pandemic has led to a critical situation for decision-makers regarding their supply. After authorizing the use of FFRs certified by other regions of the world, decision-makers in many countries have published alerts, particularly concerning the ‘KN95’ type. Methods This paper investigated the filtration performance of different FFRs using an experimental setup already employed during several studies on FFRs filtration performance. Its high-resolution measuring devices permit to determine filtration performance according to the normative criteria: the pressure drop and the filtration efficiency. Eight different FFRs have been used: four NIOSH-approved FFRs and four not NIOSH-approved with a ‘KN95’ shape available during the beginning of the COVID-19 pandemic. Results The data show a high disparity between different FFRs purchased by healthcare establishments, and between those that are NIOSH-approved and those that are not NIOSH-approved. The results confirm that the NIOSH certification offers good protection according to the normative criteria. The ‘KN95’ types present pressure drops which correspond to the normative value, however their efficiencies are lower than the efficiencies of FFRs certified by NIOSH and lower than 95% at the most penetrate particle size. Conclusions FFRs marking is not sufficient to conclude on the FFRs’ efficiency. Visual inspection can not determine which samples are counterfeit or have manufacturing defects.

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“…In addition, because particles less than 0.3 μm can be filtered due to the Brownian motion, the use of a HEPA filter is essential 48 . Nevertheless, an ultra‐low penetration air (ULPA) filter or a high‐rated MERV filter with a rating of MERV 17 or higher should be used to remove ultrafine and fine particles with a higher level of efficiency 49 . Lastly, if the temperature inside the chamber is high, the performance of the 3D printer may decrease.…”

Section: Resultsmentioning

confidence: 99%

Analysis of ways to reduce potential health risk from ultrafine and fine particles emitted from 3D printers in the makerspace

et al. 2022

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The maker culture that allows anyone to make necessary things with his/her own hands has been prevalent. In line with this trend, the makerspace equipped with fabrication tools such as 3D printers, 3D scanners, and laser cutters has spread worldwide. 1 In particular, this spread has been accelerated with the expiration of a patent for the fused deposition modeling (FDM)-3D printer. The FDM-3D printer is the most commonly used device in the makerspace due to the initial purchase cost and material cost reductions as it melts the filament to produce stacked layers. 2,3 Despite these advantages, the FDM-3D printer serves as a primary source for the emission of ultrafine and fine particles from the process of melting the filament, and thus, may cause health problems among occupants. 4 Fine particles are substances with a particle diameter of less than 2.5 μm, while ultrafine particle are substances with a particle diameter of 0.1 μm (i.e., 100 nm) or less. 5 Because ultrafine and fine particles have very small diameters, they can be suspended in the air for a long time. In general, fine particles with a diameter of 1~10 μm are deposited in the bronchial tubes, and ultrafine particles with a diameter of less than 100 nm can be deposited in the alveoli, including the bronchi. While short-term exposure

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Filtration of nanoparticles applied in general ventilation

Cited by 16 publications

References 58 publications

Chemical discrimination of the particulate and gas phases of miniCAST exhausts using a two-filter collection method

Chemical discrimination of the particulate and gas phases of miniCAST exhausts using a two-filter collection method

How Effective Is the Filtration of ‘KN95’ Filtering Facepiece Respirators During the COVID-19 Pandemic?

Analysis of ways to reduce potential health risk from ultrafine and fine particles emitted from 3D printers in the makerspace

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