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Chemical Properties and Formation Mechanism of Nucleation Particles Exhausted From Diesel Engine Vehicles
Published October 27, 2004 by Society of Automotive Engineers of Japan in Japan
Event: JSAE Autumn Conference
Theoretical simulation and chemical analysis have been conducted to clarify the formation mechanism of nucleation particles formed under idling condition in a light- duty diesel engine system. The formation of the nucleation particles at idle could be simulated by considering the existence of materials which had lower vapor pressure and surface tension than C26H54. To study the existence of materials which had the specific physical properties, particles observed at idle were classified by using MOUDI and Nano-MOUDI, and the size-classified particles were analyzed by EPMA, FT-IR, GC-MS and TOF-SIMS. From the analytical results of the classified particles, it was found that percentage contents of both hetero (C-H-O)-compounds and pyrolytic products of an engine oil additive increased with the decrease in the diameter of particles. Those materials would play an important part in the nucleation of nanoparticles at idle.