Ji, Jun Ho Kim, Jong Bum Lee, Gwangjae Bae, Gwi-Nam 2024-01-20T07:34:24Z 2024-01-20T07:34:24Z 2021-09-04 2015-02-06 1388-0764 https://pubs.kist.re.kr/handle/201004/125772 As carbon nanotubes (CNTs) are widely used in various applications, exposure assessment also increases in importance with other various toxicity tests for CNTs. We conducted 24-h continuous nanoaerosol measurements to identify possible nanomaterial release in a single-walled carbon nanotube (SWCNT) manufacturing workplace. Four real-time aerosol instruments were used to determine the nanosized and microsized particle numbers, particle surface area, and carbonaceous species. Task-based exposure assessment was carried out for SWCNT synthesis using the arc plasma and thermal decomposition processes to remove amorphous carbon components as impurities. During the SWCNT synthesis, the black carbon (BC) concentration was 2-12 mu g/m(3). The maximum BC mass concentrations occurred when the synthesis chamber was opened for harvesting the SWCNTs. The number concentrations of particles with sizes 10-420 nm were 10,000-40,000 particles/cm(3) during the tasks. The maximum number concentration existed when a vacuum pump was operated to remove exhaust air from the SWCNT synthesis chamber due to the penetration of highly concentrated oil mists through the window opened. We analyzed the particle mass size distribution and particle number size distribution for each peak episode. Using real-time aerosol detectors, we distinguished the SWCNT releases from background nanoaerosols such as oil mist and atmospheric photochemical smog particles. SWCNT aggregates with sizes of 1-10 mu m were mainly released from the arc plasma synthesis. The harvesting process was the main release route of SWCNTs in the workplace. English SPRINGER EXPOSURE ASSESSMENT SIZE DISTRIBUTIONS NANOPARTICLE Nanomaterial release characteristics in a single-walled carbon nanotube manufacturing workplace Article 10.1007/s11051-015-2884-x 1 JOURNAL OF NANOPARTICLE RESEARCH, v.17, no.2 JOURNAL OF NANOPARTICLE RESEARCH 17 2 scie scopus 000352231800005 2-s2.0-84922432423 Chemistry, Multidisciplinary Nanoscience & Nanotechnology Materials Science, Multidisciplinary Chemistry Science & Technology - Other Topics Materials Science Article EXPOSURE ASSESSMENT SIZE DISTRIBUTIONS NANOPARTICLE Single-walled carbon nanotube Nanomaterial Release Workplace