Direct Observation of Chemical Oscillation at a Water/Nitrobenzene Interface with a Sodium-alkyl-sulfate System

DOI PDF Web Site Web Site Web Site View 1 Remaining Hide 15 Citations 46 References
  • IKEZOE Yasuhiro
    Department of Applied Chemistry, Graduate School of Engineering, The University of Tokyo
  • ISHIZAKI Sadahiro
    Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo
  • YUI Hiroharu
    Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology (JST)
  • FUJINAMI Masanori
    Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology (JST)
  • SAWADA Tsuguo
    Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology (JST)

Search this article

Abstract

The oscillation of the interfacial tension and electrical potential at a water/nitrobenzene interface was observed with homologous anionic surfactant molecules, sodium-alkyl-sulfates. Concerning small molecules with a short hydrophobic carbon chain, the oscillation period and amplitude decreased with a decrease of the length of the alkyl chain. On the other hand, when surfactant molecules with a long hydrophobic carbon chain were used, no remarkable periodic oscillation occurred after the first oscillation. In all systems, an interfacial flow by Marangoni convection was observed when the oscillation took place. By monitoring the movement of carbon powder scattered on the liquid/liquid interface with a CCD camera, we could observe that the liquid/liquid interface expanded outward from the area on which the surfactant molecules adsorbed when the oscillation occurred. When the small molecule was used, the speed of expansion of the interface (flow speed) was small and shrinkage followed by expansion of the interface repeatedly occurred. However, when the large molecule was used, the flow speed was large and expansion occurred only one time. These results show that hydrodynamic factors and surface activities are important in chemical oscillation systems.

Journal

  • Analytical Sciences

    Analytical Sciences 20 (3), 435-440, 2004

    The Japan Society for Analytical Chemistry

Citations (15)*help

See more

References(46)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top