Namgung, Hyeong-Gyu Kim, Jong Bum Kim, Min-Soo Kim, Minhae Park, Sechan Woo, Sang-Hee Bae, Gwi-Nam Park, Duckshin Kwon, Soon-Bark 2024-01-20T02:30:32Z 2024-01-20T02:30:32Z 2021-09-01 2017-02 0043-1648 https://pubs.kist.re.kr/handle/201004/123148 Contributions of exhaust and non-exhaust sources to traffic-related particulate matter (PM) pollution in the atmosphere are almost identical and the most important non-exhaust source is known to be brake wear particles. In order to understand the properties and harmful effects of wear particles on people, accurate information on size distribution of brake wear particles is needed. Our previous study investigated the measured changes in size distribution of nanoparticles of 500 nm or smaller to understand the origin of nanoparticles due to temperature increases on the friction surface. The present study was intended to investigate the characteristics of size distribution (5.6 nm-32 mu m) of PM released under different braking conditions by using different instruments. The measurement results under 9 braking conditions using 3 different instruments showed that the size distribution chatacteristics of particles can be divided into two main types according to braking energy. The first type is of PM up to 10 mu m in size and with a peak number concentration at 0.2-0.75 mu m regardless of braking energy, while the second type is of PM around 10 nm in size generated only when braking energy increased and particles that increased up to 100 nm. In addition, we found that the size distributions measured by the optical particle counter (OPC) and the aerodynamic particle sizer (APS) were consistent by assuming a mean diameter ratio of two instruments. (C) 2016 Elsevier B.V. All rights reserved. English Elsevier BV Size distribution analysis of airborne wear particles released by subway brake system Article 10.1016/j.wear.2016.12.026 1 Wear, v.372, pp.169 - 176 Wear 372 169 176 N scie scopus 000394400900016 2-s2.0-85007154326 Engineering, Mechanical Materials Science, Multidisciplinary Engineering Materials Science Article PARTICULATE MATTER ULTRAFINE PARTICLES ANTIMONY SOURCES ABRASION DUSTS EMISSIONS ROAD TESTS PADS TIRE AIR Brake wear particles Nanoparticles Particle sizing instrument Particle size distribution Braking energy