Interfacial tension between water and high pressure CO2 in the presence of hydrocarbon surfactants

Takashi Akutsu, Yoshinori Yamaji, Hirokazu Yamaguchi, Masaru Watanabe, Richard L. Smith, Hiroshi Inomata

Research output: Contribution to journalArticlepeer-review

42 Citations (Scopus)


Interfacial tension of water-CO2 interface was measured by pendant drop method in the presence of a surfactant of various concentrations. The surfactants used were three surfynols which are non-ionic blanched hydrocarbon with different length of the alkyl side chain. Prior to the interfacial tension measurements, the solubility of the surfynols in CO2 were determined from cloud point method. The measured interfacial tensions indicated that an addition of small amount surfactant did reduce the interfacial tension. The interfacial activities of surfactants were evaluated from the slope of the interfacial tension reduction curve against the surfactant concentration and rationalized in terms of the molecular natures such as hydrophobic alkyl chain length.

Original languageEnglish
Pages (from-to)163-168
Number of pages6
JournalFluid Phase Equilibria
Issue number2
Publication statusPublished - 2007 Aug 25


  • CO
  • Interfacial tension
  • Pendant drop
  • Surfynol
  • Water

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry


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