HRTEM Study of diesel soot collected from diesel particulate filters

Randy L. Vander Wal, Aleksey Yezerets, Neal W. Currier, Do Heui Kim, Chong Min Wang

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246 Scopus citations


HRTEM study of several soot samples collected on Diesel Particulate Filters (DPF) under conditions relevant to practical applications of DPF technology, revealed nano-structure, to our knowledge, not reported previously for diesel soot. In particular, some of the primary particles were found to have hollow interior, and the outer shell exhibiting evidence of graphitization, with a higher crystallinity compared to the non-hollowed particles. The percentage of such particles varied between different soot samples and tentatively appeared to be related to the oxidation history of the sample. Remarkably, similar effect was not reproduced for a carbon black sample, Printex-U, suggesting that propensity to such oxidation-induced graphitization is related to the original nano-structure of the particle. These initial observations were independently confirmed for the same set of soot samples by two different HRTEM facilities, at NASA-Glenn and PNNL.

Original languageEnglish (US)
Pages (from-to)70-77
Number of pages8
Issue number1
StatePublished - Jan 2007

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)


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