Micro-FTIR study of soot chemical composition—evidence of aliphatic hydrocarbons on nascent soot surfacesw

ion–carbon-addition (HACA) mechanism with rate constants analogous to gas-phase reactions of small aromatics.42 The presence of aliphatic components affect intrinsic particle properties, including mass density20 and reactive surface site density, and may influence surface growth rates and coagulation behavior due to the presence of non-aromatic functionalities and reactive sites. Thus, a quantitative speciation of chemical compositions, especially