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- W380643604 abstract "An Andersen Impactor was used to collect particulate samples in both the undiluted and diluted exhaust from a Caterpillar 3150 diesel engine operated on the EPA (Environmental Protection Agency) 13-mode cycle. Twenty-four samples were examined under a transmission electron microscope and approximately 300 photomicrographs were taken. The microscope analysis and photomicrographs revealed details concerning the physical characteristics of the particulate and permitted direct visual comparison of the samples. The photomicrographs were used to obtain diameter measurements of nearly 11,000 basic individual spherical particles that comprise the much larger aggregates/agglomerates. Size measurements were grouped, by operating mode, to provide size distributions for the basic spherical particles. At the lower temperatures of the diluted exhaust, evidence of hydrocarbon condensation is illustrated in many of the photomicrographs. In some instances, the condensed coating is so heavy as to completely obscure all detail of the aggregate/agglomerate on which it is adsorbed. The differences between undiluted and diluted exhaust samples are quickly discerned. Several of the samples showed what appeared to be droplets or pools of liquid. The results provide better qualitative data on the physical character of the basic diesel particles that make up the aggregates/agglomerates in diesel exhaust. The photomicrographs of particles in the undiluted and diluted exhaust also provide experimental evidence that both separate liquid hydrocarbons and those adsorbed on the solid particles exist in diluted diesel exhaust and not in the undiluted exhaust. No significant size differences in the basic solid particles were found between the undiluted and diluted exhaust." @default.
- W380643604 created "2016-06-24" @default.
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- W380643604 date "1979-02-01" @default.
- W380643604 modified "2023-09-24" @default.
- W380643604 title "Analysis of the Physical Characteristics of Diesel Particulate Matter Using Transmission Electron Microscope Techniques" @default.
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- W380643604 doi "https://doi.org/10.4271/790815" @default.
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