Combustion-derived soot is a polydispersion of carbon-based species ranging from a molecular scale length to a particle scale length (1-100 nm). It has been implicated as a contributor of respiratory and heart disease, and its mechanisms of action is related to the composition and structure, in turn mainly depending on the fuel and temperature environment in which soot is generated. Soot particles present a structural variability at a mesoscopic scale (size, geometry, nanostructure, primary particle diameter) that can be responsible of a different lung deposition degree and particle translocation behaviour. Moreover the toxic effects of inhaled dusts are believed to be mainly driven by oxidative stress which is the result of the generation of reactive oxygen species (ROS) that could potentially react with cells or surrounding fluid. This chapter aims to gain insights about the radical activity measured by electron spin resonance of soot generated from different fuels (benzene and ethylene) in relation to the specific local chemistry as inferred by infrared and Raman spectroscopy. The experimental work reported in this chapter was performed on combustion-derived soot collected in premixed flames in order to obtain a good control of the nanostructural parameters. The specific activity of the soot structure was also studied by washing the carbonaceous material with solvents in order to eliminate in a selective way loosely (mainly light polycyclic aromatic hydrocarbons, PAH) and strongly surface-adsorbed species (mainly large PAH).
The Effect of Nanostructure and Adsorbed Organic Species on the Radical Activity of Combustion-Derived
Gargiulo V;Ciajolo;
2012
Abstract
Combustion-derived soot is a polydispersion of carbon-based species ranging from a molecular scale length to a particle scale length (1-100 nm). It has been implicated as a contributor of respiratory and heart disease, and its mechanisms of action is related to the composition and structure, in turn mainly depending on the fuel and temperature environment in which soot is generated. Soot particles present a structural variability at a mesoscopic scale (size, geometry, nanostructure, primary particle diameter) that can be responsible of a different lung deposition degree and particle translocation behaviour. Moreover the toxic effects of inhaled dusts are believed to be mainly driven by oxidative stress which is the result of the generation of reactive oxygen species (ROS) that could potentially react with cells or surrounding fluid. This chapter aims to gain insights about the radical activity measured by electron spin resonance of soot generated from different fuels (benzene and ethylene) in relation to the specific local chemistry as inferred by infrared and Raman spectroscopy. The experimental work reported in this chapter was performed on combustion-derived soot collected in premixed flames in order to obtain a good control of the nanostructural parameters. The specific activity of the soot structure was also studied by washing the carbonaceous material with solvents in order to eliminate in a selective way loosely (mainly light polycyclic aromatic hydrocarbons, PAH) and strongly surface-adsorbed species (mainly large PAH).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
