Structural investigation on supercritical carbon dioxide and its mixture with alcohol

Takashi Sato, Masaaki Sugiyama, Masakatsu Misawa, Kei Hamada, Keiji Itoh, Kazuhiro Mori, Toshiharu Fukunaga

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


Small-angle neutron scattering (SANS) experiments were carried out for three different systems, pure CO2, CO2 + methanol (1 mol%) and CO2 + ethanol (1 mol%), along the isotherm of 311.15 K in their supercritical states. All the SANS profiles were well analyzed with Ornstein-Zernike equation. With addition of the alcohols, the maximum values of the correlation length, ξ, and the scattering intensity at Q = 0, I(0), became larger, and the pressure at which ξ and I(0) became maxima was shifted to be lower. These changes can be explained qualitatively with van der Waals equation of state by regarding CO2 + alcohol mixture as a system consisting of a single kind of virtual molecules. From this analysis, both the molecular attractive interaction and volume are suggested to be increased in the mixture. These changes were considered to be strongly connected with the increase of solubility and selectivity on entrainer effect.

Original languageEnglish
Pages (from-to)102-106
Number of pages5
JournalJournal of Molecular Liquids
Issue number1-2
Publication statusPublished - Jul 20 2009
Externally publishedYes


  • Entrainer effect
  • Small-angle neutron scattering
  • Supercritical carbon dioxide

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Spectroscopy
  • Physical and Theoretical Chemistry
  • Materials Chemistry


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