期刊
PROCEEDINGS OF THE COMBUSTION INSTITUTE
卷 38, 期 1, 页码 1375-1383出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.proci.2020.06.096
关键词
Silica particle formation; Tetramethylsilane; Combustion synthesis; Molecular-beam mass spectrometry; Transmission electron microscopy
资金
- German Research Foundation DFG [KA 3871/4-2, WL 63/1-2, WI981/14-1]
- CENIDE
This study investigates the chemical reaction mechanism of tetramethylsilane in different flame conditions, revealing the significant influence of flame composition on precursor depletion and product formation. The synthesized nanoparticles are spherical with low agglomeration, and the particle size distribution depends on the equivalence ratio of the synthesis flames.
Tetramethylsilane is a precursor often used for the production of flame-synthesized silica nanoparticles or coatings. This study investigates the chemical reaction mechanism of tetramethylsilane in a series of H-2/O-2/Ar low-pressure (p = 30 mbar) flames from fuel-lean to slightly fuel-rich flame conditions (phi= 0.8, 1.0 and 1.2). Mole fraction profiles are obtained by molecular-beam mass spectrometry. The experimental data are compared to simulations using a recently published reaction mechanism. The present study reveals the influence of the flame composition on the depletion of the precursor TMS, the formation of its main carbon-containing products (e.g. CO2 and CO) and the main silicon-containing intermediates (e.g. Si(CH3)(3)(CH2)OO), Si(OH)(4), SiO2, Si4O10H4) appearing along the routes of particle formation. TEM images of synthesized particles reveal that the nanoparticles obtained from the gas-phase synthesis are spheres with a low degree of agglomeration. The particle size distribution appears to be dependent on the equivalence ratio of the synthesis flames and the changes can tentatively be traced to different particle formation pathways. The data set provided in this work can serve a basis for improvements to the reaction mechanisms of the Si/C/H/O system that are urgently needed to improve particle synthesis processes. (C) 2020 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
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