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Carbon nanostructure and reactivity of soot particles from non-intrusive methods based on UV-VIS spectroscopy and time-resolved laser-induced incandescence

Hagen, Fabian P. ORCID iD icon 1,2,3; Kretzler, Daniel 1,3; Häber, Thomas ORCID iD icon 2; Bockhorn, Henning 1,3; Suntz, Rainer 2; Trimis, Dimosthenis 1,3
1 Engler-Bunte-Institut (EBI), Karlsruher Institut für Technologie (KIT)
2 Institut für Technische Chemie und Polymerchemie (ITCP), Karlsruher Institut für Technologie (KIT)
3 Institut für Kolbenmaschinen (IFKM), Karlsruher Institut für Technologie (KIT)


The objective of this study is to derive morphological and nanostructural properties of soot as well as the reactivity against low-temperature oxidation by O₂ from easily measurable optical properties. First, ex-situ experiments utilizing thermogravimetric analysis (TGA) and high-resolution transmission electron microscopy (HRTEM) serve to evaluate the kinetics of soot oxidation with O₂ and relate reactivity to particle morphology and nanostructure. Second, ultraviolet–visible (UV-VIS) absorption spectra provide wavelength-dependent absorption cross sections and refractive-index functions E(m~,λ). From these, optical band gap energies, EOG, and coefficients ξ∗ for single parameter functions describing the wavelength-dependency of E(m~,λ) are obtained. Third, from time-resolved laser-induced incandescence (TR-LII) ratios of the refractive-index functions E(m~,λi)/E(m~,λj) at three excitation wavelengths and primary particle size distributions are acquired.The ex-situ experiments show that the size of the graphene layers predominantly determines soot reactivity against oxidation. Graphene layer size and, therefore, soot reactivity are reflected in the UV-VIS absorption spectra and E(m~,λ), EOG, and ξ∗, respectively. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000135676
Veröffentlicht am 23.07.2021
DOI: 10.1016/j.carbon.2021.06.006
Zitationen: 18
Web of Science
Zitationen: 18
Zitationen: 21
Cover der Publikation
Zugehörige Institution(en) am KIT Engler-Bunte-Institut (EBI)
Institut für Technische Chemie und Polymerchemie (ITCP)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 09.2021
Sprache Englisch
Identifikator ISSN: 0008-6223, 1873-3891
KITopen-ID: 1000135676
HGF-Programm 38.03.04 (POF IV, LK 01) Technical Fuel Assessment
Erschienen in Carbon
Verlag Elsevier
Band 182
Seiten 634-654
Nachgewiesen in Dimensions
Web of Science
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