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International Journal of Energetic Materials and Chemical Propulsion

Erscheint 6 Ausgaben pro Jahr

ISSN Druckformat: 2150-766X

ISSN Online: 2150-7678

The Impact Factor measures the average number of citations received in a particular year by papers published in the journal during the two preceding years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) IF: 0.7 To calculate the five year Impact Factor, citations are counted in 2017 to the previous five years and divided by the source items published in the previous five years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) 5-Year IF: 0.7 The Immediacy Index is the average number of times an article is cited in the year it is published. The journal Immediacy Index indicates how quickly articles in a journal are cited. Immediacy Index: 0.1 The Eigenfactor score, developed by Jevin West and Carl Bergstrom at the University of Washington, is a rating of the total importance of a scientific journal. Journals are rated according to the number of incoming citations, with citations from highly ranked journals weighted to make a larger contribution to the eigenfactor than those from poorly ranked journals. Eigenfactor: 0.00016 The Journal Citation Indicator (JCI) is a single measurement of the field-normalized citation impact of journals in the Web of Science Core Collection across disciplines. The key words here are that the metric is normalized and cross-disciplinary. JCI: 0.18 SJR: 0.313 SNIP: 0.6 CiteScore™:: 1.6 H-Index: 16

Indexed in

COMBUSTION SYNTHESIS OF SiO, IN PREMIXED FLAMES

Volumen 5, Ausgabe 1-6, 2002, pp. 994-1003
DOI: 10.1615/IntJEnergeticMaterialsChemProp.v5.i1-6.1010
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ABSTRAKT

An experimental study of gas-phase combustion synthesis of silicon dioxide (SiO2) particles was investigated in premixed propane/air flames. Two different types of organosilicon compounds, hexamethyldisiloxane (HMDSO) and hexamethyldisilazane (HMDSA), were used as silicon precursors. The objective of this research was to study the effects of HMDSO and HMDSA concentrations and flame temperatures on the synthesis of SiO2 particles. The chemical composition of synthesized products was analyzed by an energy dispersive spectrometer (EDS), which was coupled with a scanning electron microscope (SEM). The change in flame structure with the introduction of HMDSO and HMDSA into the flame zone was observed in details and recorded by a high-resolution digital camera. As a small amount of HMDSO or HMDSA was added to premixed mixtures, a secondary flame, orange in color, appeared around the conical luminous zone of C3H8/air flames. At a flame condition of φ (equivalence ratio) = 0.57, when the mole fraction of HMDSO was higher than 0.67%, the appearance of a bright yellow flame brush was observed on the tip of the conical luminous zone. The flame brush phenomenon is believed to be caused by a particle-laden flame. With a higher equivalence ratio, the occurrence of flame brush phenomena was found at a lower HMDSO concentration. When HMDSA was used at flame conditions with high equivalence ratios (φ = 0.65 and 0.73), the flame brush like a flamelet was also observed. Moreover, the measured flame temperature was decreased with the increase of HMDSO and HMDSA mole fractions. The chemical composition of synthesized particles in this study was considered as SiOx, where x ranged from 1.75 to 2.5 when HMDSO was used and from 1.12 to 3.1 when HMDSA was entrained. This implies that the synthesized product is the combination of silicon monoxide (SiO), SiO2, and silicate (SiO32− or SiO44−). The variation of x values in SiOx suggests that HMDSO produce the synthesized particles with a composition closer to pure silicon dioxide (SiO2) than does the HMDSA.

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