Journal ArticleDOI
Synthesis of diamond powder in acetylene oxygen plasma
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TLDR
A mixture of cubic and hexagonal polytypes of diamond were identified in this paper, and larger particle sizes were observed at lower reactor pressure and higher C to O atomic ratios, while other ratios produced graphite, soot and amorphous carbon phases.Abstract:
Diamond particles 10–500 nm in diameter were produced by microwave‐assisted combustion of acetylene in oxygen. Both premixed and diffusion flame configurations were investigated. A mixture of cubic and hexagonal polytypes of diamond were identified. Larger particle sizes were observed at lower reactor pressure and higher C to O atomic ratios. C to O atomic ratios between 0.83 and 1.0 produced crystalline diamond powder while other ratios produced graphite, soot, and amorphous carbon phases. Diamond formation was not observed when reaction pressures were above 150 Torr.read more
Citations
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Phonon-enhanced light–matter interaction at the nanometre scale
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Nonthermal Plasma Synthesis of Nanocrystals: Fundamental Principles, Materials, and Applications
Uwe Kortshagen,R. Mohan Sankaran,Rui N. Pereira,Rui N. Pereira,Steven L. Girshick,Jeslin J. Wu,Eray S. Aydil +6 more
TL;DR: The fundamentals of nanocrystal formation in plasmas are discussed, practical implementations of plasma reactors are reviewed, the materials that have been produced with nonthermal plAsmas and surface chemistries that have be developed are surveyed, and an overview of applications of plasma-synthesized nanocrystals is provided.
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Studies on nucleation process in diamond CVD: an overview of recent developments
Huimin Liu,David S. Dandy +1 more
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Flame aerosol synthesis of nanostructured materials and functional devices: Processing, modeling, and diagnostics
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Possible in situ formation of meteoritic nanodiamonds in the early Solar System.
Z. R. Dai,J. P. Bradley,J. P. Bradley,David J. Joswiak,Donald E. Brownlee,H. G. M. Hill,Matthew J. Genge +6 more
TL;DR: It is reported that nanodiamonds are absent or very depleted in fragile, carbon-rich interplanetary dust particles, some of which enter the atmosphere at speeds within the range of cometary meteors.
References
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Journal ArticleDOI
Characterization of diamond films by Raman spectroscopy
Diane S. Knight,William B. White +1 more
TL;DR: The Raman spectrum of hexagonal diamond (lonsdaleite) is distinct from that of the cubic diamond and allows it to be recognized as discussed by the authors, and the Raman line width varies with mode of preparation of the diamond and has been related to degree of structural order.
Journal ArticleDOI
Homogeneous nucleation of diamond powder in the gas phase
TL;DR: In this paper, a low-pressure microwave-plasma reactor was used for homogeneous nucleation of diamond powder in a variety of hydrocarbons diluted in argon, hydrogen, or oxygen gas mixtures.
Journal ArticleDOI
Diamond synthesis using an oxygen-acetylene torch
TL;DR: In this paper, diamond microcrystallites and polycrystalline films were grown on various substrates in the ambient atmosphere with an oxygen-acetylene welding torch and analyzed with Raman spectroscopy, X-ray diffraction and electron microscopy.
Journal ArticleDOI
Dynamics of Aerosol Formation by Chemical Reaction
TL;DR: Aerosols form by chemical reactions in process and combustion gases, stack plumes, and the open atmosphere as discussed by the authors, and the formation process proceeds as follows: (1) Aerosol precursor molecules react i n the gas, producing condensable molecules.
Journal ArticleDOI
An investigation of diamond film deposition in a premixed oxyacetylene flame
Mark A. Cappelli,P. H. Paul +1 more
TL;DR: In this article, a diamond film has been deposited in a single nozzle premixed oxyacetylene flame and the results of runs of varying duration suggest that diamond is deposited via the transport of hydrocarbon fragments produced at the secondary flame front.
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