Chemical characterization of soot precursors and soot particles produced in hexane and diesel surrogates using an inverse diffusion flame burner

► Surrogate fuel produces five times more soot that the aliphatic hexane flame. ► The soot particle morphology of both flames becomes chain-like aggregates covered with tarry material. ► The primary particle size is shifted to small ranges as height above the burner increases. ► The soot particle chemical characteristics will depend of nature of initial fuel. ► Surrogate fuel produces more carbonized soot particles than hexane fuel does.