Journal
ENVIRONMENTAL POLLUTION
Volume 159, Issue 4, Pages 998-1006Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2010.11.036
Keywords
Brake wear debris; Nanoparticles; Oxidative wear; Heavy metals; Carbon black
Categories
Funding
- Czech Ministry of Education [MSM 6198910016, CZ.1.05/2.1.00/01.0040, ME10121]
- Center for Advanced Friction Studies at SIU Carbondale
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The paper addresses the wear particles released from commercially available low-metallic automotive brake pads subjected to brake dynamometer tests. Particle size distribution was measured in situ and the generated particles were collected. The collected fractions and the original bulk material were analyzed using several chemical and microscopic techniques. The experiments demonstrated that airborne wear particles with sizes between 10 nm and 20 mu m were released into the air. The numbers of nanoparticles (< 100 nm) were by three orders of magnitude larger when compared to the microparticles. A significant release of nanoparticles was measured when the average temperature of the rotor reached 300 degrees C, the combustion initiation temperature of organics present in brakes. In contrast to particle size distribution data, the microscopic analysis revealed the presence of nanoparticles, mostly in the form of agglomerates, in all captured fractions. The majority of elements present in the bulk material were also detected in the ultra-fine fraction of the wear particles. (C) 2010 Elsevier Ltd. All rights reserved.
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