On-road and laboratory investigations on non-exhaust ultrafine particles from the interaction between the tire and road pavement under braking conditions

We investigated the physical and chemical characteristics of non-exhaust ultrafine particles from on-road driving and laboratory measurements using a mobile sampling vehicle. The on-road driving and laboratory measurements during constant speed conditions revealed no enhancement of ultrafine particl...

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Bibliographic Details
Published in:Atmospheric environment (1994) 2014-11, Vol.97, p.195-205
Main Authors: Kwak, Jihyun, Lee, Sunyoup, Lee, Seokhwan
Format: Article
Language:English
Subjects:
Applied sciences
Atmospheric pollution
Atmospherics
Automotive components
Brake particles (BPs)
Braking
Constants
Exact sciences and technology
Laboratory measurement
Morphological and elemental analyses
On-road driving
Pollution
Pollution sources. Measurement results
Roads
Sampling
Tire particles (TPs)
Tires
Transports
Wear particles
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Summary:We investigated the physical and chemical characteristics of non-exhaust ultrafine particles from on-road driving and laboratory measurements using a mobile sampling vehicle. The on-road driving and laboratory measurements during constant speed conditions revealed no enhancement of ultrafine particles. Under braking events, the total number concentrations of tire particles (TPs) sampled 90 mm above the road surface was 6 times higher with broader mode diameters when compared to 40 mm above the road surface. In contrast to braking events, under cornering conditions, the total number concentrations of TPs sampled 40 mm above the road surface were 50 times higher relative to 90 mm above the road surface. From the morphological and elemental analyses, it is likely that the ultrafine particles generated from the interaction between the tire and the road surface under braking conditions might originated from sulfur-containing materials or anti-oxidants which are contained in TPs, and/or graphite and solid lubricants which are mainly present in brake particles (BPs). However, Zn which was a distinguishing elemental marker of tire wear particles didn't show in EDS spectra. Further research would be required as to the exact emission source of ultrafine particles. [Display omitted] •We investigate the physical and chemical characterization of non-exhaust particles.•Ultrafine particles were measured during on-road driving and in a laboratory.•The particle number and size distributions were observed under various conditions.•The morphological and elemental analyses can inform the particle formation.
ISSN:1352-2310
1873-2844
DOI:10.1016/j.atmosenv.2014.08.014