Nitrogen dilution effect on flame synthesis of carbon nanostructures with acoustic modulation

De Hua Chung, Ta-Hui Lin

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


Jet diffusion flames are modulated acoustically either to improve combustion efficiency or to increase soot formation traditionally. In this study, a double-flame structure was generated with a periodic flow of an ethylene-nitrogen mixture by means of acoustic modulation to study carbon nanomaterial synthesis. The formation of carbon nano-onions (CNOs) was significantly enhanced by acoustic excitation near the natural flickering frequency and the acoustical resonant frequency. The suitable range of fuel concentration for synthesis was wider at these two frequencies than at other frequencies. Furthermore, carbon nanotubes instead of CNOs formed as the fuel concentration was decreased below 20%. The available heat and carbon source fluctuated in the radial direction, which increased the radial synthetical region. This study also revealed the relationship between formation of carbon nanomaterial and nitrogen dilution, which may extend the potential of acoustic modulation in the field of flame synthesis of carbon nanomaterials.

Original languageEnglish
Pages (from-to)16287-16294
Number of pages8
JournalJournal of Physical Chemistry C
Issue number33
Publication statusPublished - 2011 Aug 25

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films


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