On the mechanism of soot nucleation
The mechanism of carbon particulate (soot) inception has been a subject of numerous studies and debates. The article begins with a critical review of prior proposals, proceeds to the analysis of factors enabling the development of a meaningful nucleation flux, and then introduces new ideas that lead...
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Published in | Physical chemistry chemical physics : PCCP Vol. 22; no. 9; pp. 5314 - 5331 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
England
Royal Society of Chemistry
04.03.2020
Royal Society of Chemistry (RSC) |
Subjects | |
Online Access | Get full text |
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Summary: | The mechanism of carbon particulate (soot) inception has been a subject of numerous studies and debates. The article begins with a critical review of prior proposals, proceeds to the analysis of factors enabling the development of a meaningful nucleation flux, and then introduces new ideas that lead to the fulfillment of these requirements. In the new proposal, a rotationally-activated dimer is formed in the collision of an aromatic molecule and an aromatic radical; the two react during the lifetime of the dimer to form a stable, doubly-bonded bridge between them, with the reaction rooted in a five-member ring present on the molecule edge. Several such reactions were examined theoretically and the most promising one generated a measurable nucleation flux. The consistency of the proposed model with known aspects of soot particle nanostructure is discussed. The foundation of the new model is fundamentally the H-Abstraction-Carbon-Addition (HACA) mechanism with the reaction affinity enhanced by rotational excitation. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 FG02-04ER15570 USDOE Office of Science (SC), Basic Energy Sciences (BES) |
ISSN: | 1463-9076 1463-9084 |
DOI: | 10.1039/d0cp00116c |