標題: Characteristic of nanoparticles generated from different nano-powders by using different dispersion methods
作者: Tsai, Chuen-Jinn
Lin, Guan-Yu
Liu, Chun-Nan
He, Chi-En
Chen, Chun-Wan
環境工程研究所
Institute of Environmental Engineering
關鍵字: Dustiness;Nano-particle;Powder dispersion;Agglomerate;Rotating drum;Nano-particle mixing
公開日期: 1-四月-2012
摘要: A standard rotating drum with a modified sampling train (RD), a vortex shaker (VS), and a SSPD (small-scale powder disperser) were used to investigate the emission characteristics of nano-powders, including nano-titanium dioxide (nano-TiO2, primary diameter: 21 nm), nano-zinc oxide (nano-ZnO, primary diameter: 30-50 nm), and nano-silicon dioxide (nano-SiO2, primary diameter: 10-30 nm). A TSI SMPS (scanning mobility particle sizer), a TSI APS (aerodynamic particle sizer), and a MSP MOUDI (micro-orifice uniform deposit impactor) were used to measure the number and mass distributions of generated particles. Significant differences in specific number and mass concentration or distributions were found among different methods and nano-powders with the most specific number and mass concentration and the smallest particles being generated by the most energetic SSPD, followed by VS and RD. Near uni-modal number or mass distributions were observed for the SSPD while bi-modal number or mass distributions existed for nano-powders except nano-SiO2 which also exhibited bimodal mass distributions. The 30-min average results showed that the mass median aerodynamic diameter (MMAD) and number median diameter (NMD) of the SSPD ranged 1.1-2.1 mu m and 166-261 nm, respectively, for all three nano-powders, which were smaller than those of the VS (MMAD: 3.3-6.0 mu m and NMD: 156-462 nm), and the RD (MMAD: 5.2-11.2 mu m and NMD: 198-479 nm). For nano-particles (electric mobility diameter < 100 nm), specific mass concentrations were nearly negligible for all three nano-powders and test methods. Specific number concentrations of nano-particles were low for the RD tester but were elevated when more energetic VS and SSPD testers were used. The quantitative size and concentration data obtained in this study is useful to elucidate the field emission and personal exposure data in the future provided that particle loss in the generation system is carefully assessed.
URI: http://dx.doi.org/777
http://hdl.handle.net/11536/16097
ISSN: 1388-0764
DOI: 777
期刊: JOURNAL OF NANOPARTICLE RESEARCH
Volume: 14
Issue: 4
結束頁: 
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