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Materials 2015, 8(8), 4805-4816; doi:10.3390/ma8084805

Enhanced Synthesis of Carbon Nanomaterials Using Acoustically Excited Methane Diffusion Flames

1
Department of Mechanical Engineering, Kun Shan University, Tainan 71070, Taiwan
2
Research Center for Energy Technology and Strategy, National Cheng Kung University, Tainan 70101, Taiwan
3
Department of Mechanical Engineering, National Cheng Kung University, Tainan 70101, Taiwan
*
Authors to whom correspondence should be addressed.
Academic Editor: Teen-Hang Meen
Received: 30 June 2015 / Revised: 23 July 2015 / Accepted: 24 July 2015 / Published: 29 July 2015
(This article belongs to the Special Issue Selected Papers from ICASI 2015)
View Full-Text   |   Download PDF [2521 KB, uploaded 29 July 2015]   |  

Abstract

Acoustically modulated methane jet diffusion flames were used to enhance carbon nanostructure synthesis. A catalytic nickel substrate was employed to collect the deposit materials at sampling position z = 10 mm above the burner exit. The fabrication of carbon nano-onions (CNOs) and carbon nanotubes (CNTs) was significantly enhanced by acoustic excitation at frequencies near the natural flickering frequency (ƒ = 20 Hz) and near the acoustically resonant frequency (ƒ = 90 Hz), respectively. At these characteristic frequencies, flow mixing was markedly enhanced by acoustic excitation, and a flame structure with a bright slender core flame was generated, which provided a favorable flame environment for the growth of carbon nanomaterials. The production rate of CNOs was high at 20 Hz (near the natural flickering frequency), at which the gas temperature was about 680 °C. Additionally, a quantity of CNTs was obtained at 70–95 Hz, near the acoustically resonant frequency, at which the gas temperature was between 665 and 830 °C. However, no carbon nanomaterials were synthesized at other frequencies. The enhanced synthesis of CNOs and CNTs is attributed to the strong mixing of the fuel and oxidizer due to the acoustic excitation at resonant frequencies. View Full-Text
Keywords: flame synthesis; carbon nanotubes; carbon nano-onions; acoustic excitation flame synthesis; carbon nanotubes; carbon nano-onions; acoustic excitation
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Hou, S.-S.; Chen, K.-M.; Yang, Z.-Y.; Lin, T.-H. Enhanced Synthesis of Carbon Nanomaterials Using Acoustically Excited Methane Diffusion Flames. Materials 2015, 8, 4805-4816.

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