Lähde Tero, Rönkkö Topi, Virtanen Annele, Schuck Tanja J, Pirjola Liisa, Hämeri Kaarle, Kulmala Markku, Arnold Frank, Rothe Dieter, Keskinen Jorma
Aerosol Physics Laboratory, Department of Physics, Tampere University of Technology, P. O. Box 692, FIN -33101, Tampere, Finland.
Environ Sci Technol. 2009 Jan 1;43(1):163-8. doi: 10.1021/es801690h.
Heavy duty EURO 4 diesel engine exhaust particle and ion size distributions were measured atthetailpipe using dynamometer testing. Measurements of particle volatility and electrical charge were undertaken to clarify diesel exhaust nucleation mode characteristics with different exhaust after-treatment systems. Nucleation mode particle volatility and charging probability were dependent on exhaust after-treatment particles were volatile and uncharged when the engine was equipped with diesel particulate filter and partly volatile and partly charged in exhaust without any after-treatment or with an oxidation catalyst only. The absence of charged particles in the nucleation mode of diesel particulate filtered exhaust excludes the ion mediated process as a nucleation particle formation mechanism.
使用测功机测试在排气管处测量了重型欧4柴油发动机的排气颗粒和离子尺寸分布。进行了颗粒挥发性和电荷测量，以阐明不同排气后处理系统下柴油排气成核模式的特征。成核模式颗粒的挥发性和充电概率取决于排气后处理。当发动机配备柴油颗粒过滤器时，颗粒是挥发性的且不带电；在没有任何后处理或仅配备氧化催化剂的排气中，颗粒部分挥发性且部分带电。柴油颗粒过滤排气的成核模式中不存在带电粒子，这排除了离子介导过程作为成核颗粒形成机制的可能性。
