Carbonaceous soot particles from a SIDI engine are characterized by physical and chemical characterization techniques. Physical characterization included aggregate size and morphology, primary particle size and internal nanostructure, each by TEM and corresponding image analyses.  Chemical characterization included composition and bonding as analyzed by XPS and FTIR-ATR, each a spectroscopic technique.  Engine operational conditions included lean, rich, high-load cases and an advanced ignition test, each relative to a reference condition.  The aggregates formed for the conditions with lesser time for in-cylinder mixing appeared to be more compact with a higher level of tortuosity. XPS indicated considerable matter while FTIR-ATR confirmed that the organic component was not condensed volatiles but matrix bound organics. A small (< 15%) surface oxygen content was observed by XPS, consistent with FTIR suggesting that the organic content is largely alkyl hydrocarbons rather than oxygenated species.

Physical and chemical particulate characterization for varied engine operation in a gasoline, spark ignited, direct injection engine

244th National Meeting (2012)

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