Creation of carbon onions and coils at low temperature in near-critical benzene irradiated with an ultraviolet laser

Takahiro Fukuda, Nami Watabe, Raymond Whitby, Toru Maekawa

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Gas-liquid coexistence curves terminate at their critical points, where second-order phase transitions occur. The specific heat and compressibility increase greatly as the fluid systems approach their critical points. As a result, thermal diffusion is suppressed and the perturbations of the temperature, pressure and density propagate as acoustic waves. In this paper, we irradiate near-critical benzene with a laser beam of 266 nm in wavelength, the energy flux of which is 1.3 and 3.9 mW mm-2, and show that benzene is dissociated and various carbon nano/microstructures such as carbon onions and coils are created. Carbon onions are produced in both subcritical (200°C) and supercritical (290°C) benzene, whereas carbon coils are produced on an alloy catalyst composed of (Fe:Cr:Ni = 74:18:8) in supercritical benzene irradiated with a laser beam of 3.9 mW mm-2. The operational temperature of the present method is much lower than that used in conventional carbon structure synthesizing methods and a large number of carbon structures, such as carbon onions and coils, are produced in supercritical benzene.

Original languageEnglish
Article number415604
JournalNanotechnology
Volume18
Issue number41
DOIs
Publication statusPublished - Oct 17 2007
Externally publishedYes

Fingerprint

Ultraviolet lasers
Benzene
Carbon
Temperature
Laser beams
Thermal diffusion
Compressibility
Specific heat
Gases
Phase transitions
Acoustic waves
Fluxes
Wavelength
Microstructure
Catalysts
Fluids
Liquids

ASJC Scopus subject areas

  • Materials Science(all)
  • Bioengineering
  • Chemistry(all)
  • Electrical and Electronic Engineering
  • Mechanical Engineering
  • Mechanics of Materials

Cite this

Creation of carbon onions and coils at low temperature in near-critical benzene irradiated with an ultraviolet laser. / Fukuda, Takahiro; Watabe, Nami; Whitby, Raymond; Maekawa, Toru.

In: Nanotechnology, Vol. 18, No. 41, 415604, 17.10.2007.

Research output: Contribution to journalArticle

Fukuda, Takahiro ; Watabe, Nami ; Whitby, Raymond ; Maekawa, Toru. / Creation of carbon onions and coils at low temperature in near-critical benzene irradiated with an ultraviolet laser. In: Nanotechnology. 2007 ; Vol. 18, No. 41.
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