title: Heavy duty diesel engine exhaust aerosol particle and ion measurements.
abstract: 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.
authors.affiliation: Aerosol Physics Laboratory, Department of Physics, Tampere University of Technology, P. O. Box 692, FIN -33101, Tampere, Finland.
authors.forename: Tero
authors.initials: T
authors.lastname: Lähde
authors.forename: Topi
authors.initials: T
authors.lastname: Rönkkö
authors.forename: Annele
authors.initials: A
authors.lastname: Virtanen
authors.forename: Tanja J
authors.initials: TJ
authors.lastname: Schuck
authors.forename: Liisa
authors.initials: L
authors.lastname: Pirjola
authors.forename: Kaarle
authors.initials: K
authors.lastname: Hämeri
authors.forename: Markku
authors.initials: M
authors.lastname: Kulmala
authors.forename: Frank
authors.initials: F
authors.lastname: Arnold
authors.forename: Dieter
authors.initials: D
authors.lastname: Rothe
authors.forename: Jorma
authors.initials: J
authors.lastname: Keskinen
mesh_terms: D000336:Aerosols / Q000032:analysis*; D002244:Carbon / Q000032:analysis; D007477:Ions; D018986:Motor Vehicles; D010316:Particle Size; D052638:Particulate Matter / Q000032:analysis*; D012995:Solubility; D001335:Vehicle Emissions / Q000032:analysis*
chemical_list: D000336:Aerosols; D007477:Ions; D052638:Particulate Matter; D001335:Vehicle Emissions; D002244:Carbon