First in-flight synchrotron X-ray absorption and photoemission study of carbon soot nanoparticles.

Autor:	Ouf FX; Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSN-RES, SCA, LPMA, Gif-Sur-Yvette, 91192, France., Parent P; Aix Marseille Univ, CNRS, CINAM, Marseille, France., Laffon C; Aix Marseille Univ, CNRS, CINAM, Marseille, France., Marhaba I; Aix Marseille Univ, CNRS, CINAM, Marseille, France., Ferry D; Aix Marseille Univ, CNRS, CINAM, Marseille, France., Marcillaud B; Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSN-RES, SCA, LPMA, Gif-Sur-Yvette, 91192, France., Antonsson E; Synchrotron SOLEIL, Saint Aubin, BP 48, Gif-sur-Yvette Cedex, 91192, France.; Physical Chemistry, Freie Universität Berlin Takustr. 3, D-14195 Berlin, Germany., Benkoula S; Synchrotron SOLEIL, Saint Aubin, BP 48, Gif-sur-Yvette Cedex, 91192, France., Liu XJ; School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191,China., Nicolas C; Synchrotron SOLEIL, Saint Aubin, BP 48, Gif-sur-Yvette Cedex, 91192, France., Robert E; Synchrotron SOLEIL, Saint Aubin, BP 48, Gif-sur-Yvette Cedex, 91192, France., Patanen M; Synchrotron SOLEIL, Saint Aubin, BP 48, Gif-sur-Yvette Cedex, 91192, France.; Nano and Molecular Systems Research Unit, Molecular Materials Research Community, Faculty of Science, P.O. Box 3000, 90014 University of Oulu, Finland., Barreda FA; NIMBE/CEA/CNRS/Université Paris-Saclay/Laboratoire Edifices Nanométriques, CEA Saclay, Gif-sur-Yvette Cedex, 91191, France., Sublemontier O; NIMBE/CEA/CNRS/Université Paris-Saclay/Laboratoire Edifices Nanométriques, CEA Saclay, Gif-sur-Yvette Cedex, 91191, France., Coppalle A; Normandie Univ, INSA Rouen, UNIROUEN, CNRS, CORIA, 76000 Rouen, France., Yon J; Normandie Univ, INSA Rouen, UNIROUEN, CNRS, CORIA, 76000 Rouen, France., Miserque F; CEA/DEN/DPC/SCCME/Laboratoire d'Etude de la Corrosion Aqueuse, CEA Saclay, Gif-sur-Yvette Cedex, 91191, France., Mostefaoui T; Laboratoire de Physico-Chimie des Matériaux et Catalyse, Faculté des Sciences Exactes, Université de Bejaia, 06000 Bejaia, Algérie., Regier TZ; Canadian Light Source, Saskatoon, SK S7N 2V3, Canada., Mitchell JA; Institut de Physique de Rennes, UMR 6251, Université Rennes 1, Rennes Cedex, 35042, France., Miron C; Synchrotron SOLEIL, Saint Aubin, BP 48, Gif-sur-Yvette Cedex, 91192, France.; Extreme Light Infrastructure - Nuclear Physiscs (ELI-NP), 'Horia Hulubei' National Institute for Physics and Nuclear Engineering, 30 Reactorului Street, RO-077125 Măgurele, Jud. Ilfov, Romania.
Jazyk:	angličtina
Zdroj:	Scientific reports [Sci Rep] 2016 Nov 24; Vol. 6, pp. 36495. Date of Electronic Publication: 2016 Nov 24.
DOI:	10.1038/srep36495
Abstrakt:	Many studies have been conducted on the environmental impacts of combustion generated aerosols. Due to their complex composition and morphology, their chemical reactivity is not well understood and new developments of analysis methods are needed. We report the first demonstration of in-flight X-ray based characterizations of freshly emitted soot particles, which is of paramount importance for understanding the role of one of the main anthropogenic particulate contributors to global climate change. Soot particles, produced by a burner for several air-to-fuel ratios, were injected through an aerodynamic lens, focusing them to a region where they interacted with synchrotron radiation. X-ray photoelectron spectroscopy and carbon K-edge near-edge X-ray absorption spectroscopy were performed and compared to those obtained for supported samples. A good agreement is found between these samples, although slight oxidation is observed for supported samples. Our experiments demonstrate that NEXAFS characterization of supported samples provides relevant information on soot composition, with limited effects of contamination or ageing under ambient storage conditions. The highly surface sensitive XPS experiments of airborne soot indicate that the oxidation is different at the surface as compared to the bulk probed by NEXAFS. We also report changes in soot's work function obtained at different combustion conditions.
Databáze:	MEDLINE
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