標題: Exposure assessment and engineering control strategies for airborne nanoparticles: an application to emissions from nanocomposite compounding processes
作者: Tsai, Candace S. -J.
White, David
Rodriguez, Henoc
Munoz, Christian E.
Huang, Cheng-Yu
Tsai, Chuen-Jinn
Barry, Carol
Ellenbecker, Michael J.
環境工程研究所
Institute of Environmental Engineering
關鍵字: Airborne nanoparticle;Nanoalumina;Nanoclay;Nanocomposite compounding;Inhalation exposure;Engineering control
公開日期: 1-七月-2012
摘要: "In this study, nanoalumina and nanoclay particles were compounded separately with ethylene vinyl acetate (EVA) polymer to produce nanocomposites using a twin-screw extruder to investigate exposure and effective controls. Nanoparticle exposures from compounding processes were elevated under some circumstances and were affected by many factors including inadequate ventilation, surrounding air flow, feeder type, feeding method, and nanoparticle type. Engineering controls such as improved ventilation and enclosure of releasing sources were applied to the process equipment to evaluate the effectiveness of control. The nanoparticle loading device was modified by installing a ventilated enclosure surrounding the loading chamber. Exposures were studied using designed controls for comparison which include three scenarios: (1) no isolation; (2) enclosed sources; and (3) enclosed sources and improved ventilation. Particle number concentrations for diameters from 5 to 20,000 nm measured by the Fast Mobility Particle Sizer and aerodynamic particle sizer were studied. Aerosol particles were sampled on transmission electron microscope grids to characterize particle composition and morphology. Measurements and samples were taken at the near-and far-field areas relative to releasing sources. Airborne particle concentrations were reduced significantly when using the feeder enclosure, and the concentrations were below the baseline when two sources were enclosed, and the ventilation was improved when using either nanoalumina or nanoclay as fillers."
URI: http://dx.doi.org/989
http://hdl.handle.net/11536/16655
ISSN: 1388-0764
DOI: 989
期刊: JOURNAL OF NANOPARTICLE RESEARCH
Volume: 14
Issue: 7
結束頁: 
顯示於類別:期刊論文


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  1. 000306058900043.pdf