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Full-Text Articles in Physical Sciences and Mathematics
An Unexpected Restructuring Of Combustion Soot Aggregates By Subnanometer Coatings Of Polycyclic Aromatic Hydrocarbons, Chao Chen, Xiaolong Fan, Tasneem Shaltout, Chong Qiu, Yan Ma, Andrew Goldman, Alexei F. Khalizov
An Unexpected Restructuring Of Combustion Soot Aggregates By Subnanometer Coatings Of Polycyclic Aromatic Hydrocarbons, Chao Chen, Xiaolong Fan, Tasneem Shaltout, Chong Qiu, Yan Ma, Andrew Goldman, Alexei F. Khalizov
Chemistry and Chemical Engineering Faculty Publications
We investigated the effect of thin polycyclic aromatic hydrocarbon (PAH) coatings on the structure of soot aggregates. Soot aerosol from an inverted diffusion burner was size classified, thermally denuded, coated with six different PAHs, and then characterized using scanning electron microscopy, light scattering, and mass-mobility measurements. Contrary to our expectation, significant restructuring was observed in the presence of subnanometer layers of pyrene, fluoranthene, and phenanthrene. These PAHs remained in subcooled liquid state in thin films, whereby the liquid layer acted as a lubricant, reducing the force required to initiate the restructuring. Thin layers of PAH of higher melting temperatures (perylene, …