Measurement of electrical charges carried by airborne bacteria laboratory-generated using a single-pass bubbling aerosolizer

Simon, Xavier; Bau, Sébastien; Bémer, Denis; Duquenne, Philippe

doi:10.1016/j.partic.2014.05.009

Cited by 6 publications

(3 citation statements)

References 32 publications

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“…Finally, the electrical state-of-charge for particles was determined by combining airborne particle current and number size distributions measured by an ELPI, as detailed in Simon et al (2015). With this method, the net number of elementary electrical charges p(d a ) carried per particle was determined in each channel by applying the following formula (Eq.…”

Section: Aerosol Characterizationmentioning

confidence: 99%

Design and Characterization of an Inhalation System to Expose Rodents to Nanoaerosols

Cosnier

Bau

Grossmann

et al. 2016

Aerosol Air Qual. Res.

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The number of workers potentially exposed to nanoparticles (NPs) in industrial processes is constantly increasing, even though the toxicological effects of these compounds have not yet been fully characterized. The hazards associated with this exposure can be assessed most relevantly by toxicology studies involving inhalation of nanoaerosols by animals.In this paper, we describe and characterize an aerosol generated in a nose-only exposure system used to study the respiratory effects of NPs in rat; this system was designed to meet the most stringent requirements for animal testing in terms of protection of operators against risks associated with NPs and biohazards and to comply with the OECD guidelines for chemical testing.The inhalation facility was fully validated by exposing Fisher 344 rats to TiO 2 P25 aerosols at 10 mg m -3. Aerosol monitoring and in-depth characterization were ensured by real-time devices (condensation particle counter, optical particle sizer, scanning mobility particle sizer, aerodynamic particle sizer and electrical low pressure impactor) and samples taken for off-line analyses (gravimetric analysis, mass size distribution from cascade impactor, TEM observations).The test atmosphere was stable in terms of concentrations and distributions (mass or number) between different inhalation towers on a given day and between days (intra-experiment), as well as between inhalation campaigns (between experiments). In terms of the respiratory deposition profile, preliminary results after exposure for one month indicate that this system is relevant, and should therefore be appropriate for in vivo inhalation toxicity studies.

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Section: Aerosol Characterizationmentioning

confidence: 99%

Design and Characterization of an Inhalation System to Expose Rodents to Nanoaerosols

Cosnier

Bau

Grossmann

et al. 2016

Aerosol Air Qual. Res.

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“…A review of studies on sterilization through ESPs suggested that: • E. coli carries negative electric charges when it is spread by air [38]; • when the transmembrane potential of the E. coli cells exceeds 1 V, the cells are killed by electroporation [38,39]; • viruses and bacteria can be attached to bioaerosols [39][40][41].…”

mentioning

confidence: 99%

“…On the basis of these assumptions, the present study analyzed the ESP's collection efficiency and sterilization performance by considering an electroporation process that arises from dramatic changes in electric potential [38,39]-which occur when bioaerosols carrying viruses and bacteria are collected [41,42] or when the ESP absorbs airborne E. coli that carries negative electric charges [38].…”

mentioning

confidence: 99%

Electrostatic Precipitator Design Optimization for the Removal of Aerosol and Airborne Viruses

Chen

et al. 2023

Sustainability

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In the midst of the COVID-19 pandemic, new requirements for clean air supply are introduced for heating, ventilation, and air conditioning (HVAC) systems. One way for HVAC systems to efficiently remove airborne viruses is by filtering them. Unlike disposable filters that require repeated purchases of consumables, the electrostatic precipitator (ESP) is an alternative option without the drawback of reduced dust collection efficiency in high-efficiency particulate air (HEPA) filters due to dust buildup. The majority of viruses have a diameter ranging from 0.1 μm to 5 μm. This study proposed a two-stage ESP, which charged airborne viruses and particles via positive electrode ionization wire and collected them on a collecting plate with high voltage. Numerical simulations were conducted and revealed a continuous decrease in collection efficiencies between 0.1 μm and 0.5 μm, followed by a consistent increase from 0.5 μm to 1 μm. For particles larger than 1 μm, collection efficiencies exceeding 90% were easily achieved with the equipment used in this study. Previous studies have demonstrated that the collection efficiency of suspended particles is influenced by both the ESP voltage and turbulent flow at this stage. To improve the collection efficiency of aerosols ranging from 0.1 μm to 1 μm, this study used a multi-objective genetic algorithm (MOGA) in combination with numerical simulations to obtain the optimal parameter combination of ionization voltage and flow speed. The particle collection performance of the ESP was examined under the Japan Electrical Manufacturers’ Association (JEMA) standards and showed consistent collection performance throughout the experiment. Moreover, after its design was optimized, the precipitator collected aerosols ranging from 0.1 μm to 3 μm, demonstrating an efficiency of over 95%. With such high collection efficiency, the proposed ESP can effectively filter airborne particles as efficiently as an N95 respirator, eliminating the need to wear a mask in a building and preventing the spread of droplet infectious diseases such as COVID-19 (0.08 μm–0.16 μm).

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An Introduction to Aerosols

Thomas¹,

Charvet²

2017

Aerosol Filtration

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Measurement of electrical charges carried by airborne bacteria laboratory-generated using a single-pass bubbling aerosolizer

Cited by 6 publications

References 32 publications

Design and Characterization of an Inhalation System to Expose Rodents to Nanoaerosols

Design and Characterization of an Inhalation System to Expose Rodents to Nanoaerosols

Electrostatic Precipitator Design Optimization for the Removal of Aerosol and Airborne Viruses

An Introduction to Aerosols

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