An active-type dust collector that reduces brake wear particle (BWP) emission DOI
Sang-Hee Woo,

Hyoungjoon Jang,

Minki Kim

et al.

Aerosol Science and Technology, Journal Year: 2024, Volume and Issue: 58(11), P. 1293 - 1304

Published: Aug. 6, 2024

Brake wear particles (BWPs) are a major particulate matter (PM) emission of vehicles and they will be regulated under EURO-7 standards. To comply with EURO-7, some BWP reduction devices have been recently developed. However, most the studies tested in laboratory conditions, not actual vehicle conditions. In this study, dust collector composed suction device an electrostatic precipitator (EP) was developed to reduce it on vehicle. The collection efficiency (CE) EP studied conditions using brake dynamometer. More than 95% BWPs were removed when exhibited corona charge imparted carbon brush. CE would changed (SE) laboratory, SE decreased from maximum 88–62% as disk rotational speed increased. Although possible maintain above 95%, approximately 70%; overall remained 60% range. had dominant effect total efficiency. For testing, 75%, higher value measured Therefore, must estimate their real-world.

Language: Английский

High time resolution quantification of PM2.5 oxidative potential at a Central London Roadside Supersite DOI Creative Commons
Steven J. Campbell, Alexandre Barth, Gang Chen

et al.

Environment International, Journal Year: 2024, Volume and Issue: 193, P. 109102 - 109102

Published: Oct. 28, 2024

Language: Английский

Citations

4
Tribological behavior and wear particle emission influenced by surface conditions of cast iron discs DOI
Ran Cai, Xueyuan Nie, Yezhe Lyu

et al.

Surface and Coatings Technology, Journal Year: 2025, Volume and Issue: unknown, P. 131875 - 131875

Published: Feb. 1, 2025

Language: Английский

Citations

0
Emissions of Nitrous Acid, Nitryl Chloride, and Dinitrogen Pentoxide Associated with Automotive Braking DOI Creative Commons
Madeline E. Cooke,

Michelia Dam,

Lisa M. Wingen

et al.

Environmental Science & Technology, Journal Year: 2025, Volume and Issue: unknown

Published: April 30, 2025

As worldwide trends move toward replacing combustion transportation modes with electric vehicles, characterizing non-tailpipe emissions, such as those from brake wear, becomes increasingly important. Nitrous acid (HONO), nitryl chloride (ClNO2), and dinitrogen pentoxide (N2O5) are important sources of radical oxidants (e.g., •OH, •Cl, •NO3) nitrogen oxides (NOx) in the atmosphere, driving chemistry that leads to air quality degradation. Discrepancies between measurements model predictions indicate there significant unknown these species, particularly HONO, where contributions different formation processes have been controversial since first ambient observations 1970s. We report generation reactive species during automotive braking using chemical ionization mass spectrometry configured iodide reagent ion. Substantial HONO levels observed ceramic semi-metallic pads, smaller quantities ClNO2 N2O5 were also detected. propose is formed hot plume emanating rotor via abstraction by NO2 allylic aldehyde hydrogen atoms found complex mixture volatile organic compounds emitted simultaneously. These results suggest emissions must be taken into account urban oxidation chemistry.

Language: Английский

Citations

0
Residential Wood Burning and Vehicle Emissions as Major Sources of Environmentally Persistent Free Radicals in Fairbanks, Alaska DOI Creative Commons
Kasey C. Edwards, Sukriti Kapur, Ting Fang

et al.

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: 58(32), P. 14293 - 14305

Published: Aug. 2, 2024

Environmentally persistent free radicals (EPFRs) play an important role in aerosol effects on air quality and public health, but their atmospheric abundance sources are poorly understood. We measured EPFRs contained PM2.5 collected Fairbanks, Alaska, winter 2022. find that EPFR concentrations were enhanced during surface-based inversion correlate strongly with incomplete combustion markers, including carbon monoxide elemental (R2 > 0.75). exhibit moderately good correlations PAHs, biomass burning organic aerosols, potassium 0.4). also observe strong of hydrocarbon-like Fe Ti 0.6), single-particle mass spectrometry measurements reveal internal mixing iron. These results suggest residential wood vehicle tailpipes major nontailpipe emissions, such as brake wear road dust, may contribute to the stabilization EPFRs. Exposure observed (18 ± 12 pmol m–3) would be equivalent smoking ∼0.4–1 cigarette daily. Very 0.8) hydroxyl radical formation surrogate lung fluid indicate exposure induce oxidative stress human respiratory tract.

Language: Английский

Citations

3
Brake Wear and Airborne Particle Mass Emissions from Passenger Car Brakes in Dynamometer Experiments Based on the Worldwide Harmonized Light-Duty Vehicle Test Procedure Brake Cycle DOI Creative Commons
Hiroyuki Hagino

Lubricants, Journal Year: 2024, Volume and Issue: 12(6), P. 206 - 206

Published: June 5, 2024

Brake wear particles, as the major component of non-exhaust particulate matter, are known to have different emissions, depending on type brake assembly and specifications vehicle. In this study, particle mass emissions were measured under realistic vehicle driving full friction braking conditions using current commercial genuine assemblies. Although there no significant differences in either PM10 or PM2.5 between cooling air flow rates, decreased ultrafine (PM0.12) increased with increase rate. Particle measurements collected filter media, allowing chemical composition analysis identify source emissions. The iron concentration particles indicated that main contribution was derived from disc wear. Using a systematic approach study able characterize correlations elemental compositions materials, adding our understanding mechanical phenomena

Language: Английский

Citations

2
An active-type dust collector that reduces brake wear particle (BWP) emission DOI
Sang-Hee Woo,

Hyoungjoon Jang,

Minki Kim

et al.

Aerosol Science and Technology, Journal Year: 2024, Volume and Issue: 58(11), P. 1293 - 1304

Published: Aug. 6, 2024

Brake wear particles (BWPs) are a major particulate matter (PM) emission of vehicles and they will be regulated under EURO-7 standards. To comply with EURO-7, some BWP reduction devices have been recently developed. However, most the studies tested in laboratory conditions, not actual vehicle conditions. In this study, dust collector composed suction device an electrostatic precipitator (EP) was developed to reduce it on vehicle. The collection efficiency (CE) EP studied conditions using brake dynamometer. More than 95% BWPs were removed when exhibited corona charge imparted carbon brush. CE would changed (SE) laboratory, SE decreased from maximum 88–62% as disk rotational speed increased. Although possible maintain above 95%, approximately 70%; overall remained 60% range. had dominant effect total efficiency. For testing, 75%, higher value measured Therefore, must estimate their real-world.

Language: Английский

Citations

0