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    Please use this identifier to cite or link to this item: http://ir.lib.ksu.edu.tw/handle/987654321/10768


    Title: High-yield synthesis of carbon nano-onions in counterflow diffusion flames
    Authors: Shuhn-Shyurng Hou(侯順雄)
    De-Hua Chung
    Ta-Hui Lin
    Contributor: 圖書資訊館
    Date: 2009
    Issue Date: 2010-09-06 11:51:00 (UTC+8)
    Abstract: High-yield synthesis of carbon nanotubes (CNTs) and nano-onions (CNOs) on a catalytic
    nickel substrate using counterflow diffusion flames was investigated. With ethylene fixed
    at 5%, methane varied from 15% to 45% in the upper flow, and air supplied in the lower flow,
    only a moderate CH4 concentration (25%) could yield high density CNTs. However, when
    oxygen was increased to 50% in the lower flow, only CNOs were synthesized. An increase
    in methane concentration from 15% to 45% led to a higher yield and a greater diameter
    (ranging from 5 to 60 nm) of CNOs. To examine the role of mixed fuel, it was observed that
    as ethylene was removed and only 45% methane and nitrogen were supplied in the upper
    flow, no CNOs could be generated. While, as methane was increased to 50% or 55%, highyield
    CNOs were synthesized and the yield increased with methane concentration. Note
    that the key parameters influencing the formation and yield of CNOs are both the oxygen
    and fuel concentrations. There was a critical threshold value of oxygen concentration, 30%,
    for onset of CNOs synthesis. Also, the critical threshold value of methane concentration for
    onset of CNOs formation decreased with increasing oxygen concentration or ethylene
    concentration.
    Appears in Collections:[機械工程系所] 期刊論文

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