On the oscillatory phenomenon in an oil/water interface

Kiyoshi Toko, Kenichi Yoshikawa, Masaru Tsukiji, Masaaki Nosaka, Kaoru Yamafuji

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36 Citations (Scopus)


A simple theoretical model is presented for simulating the self-sustained oscillations of electric potential and pH at an oil/water interface appearing in a two-phase system composed of 2-nitropropane solution containing picrate acid and an aqueous solution of cetyltrimethylammonium bromide. In the present model, a well-known condition necessary for the occurrence of self-sustained oscillations, i.e., the presence of a positive feedback process far from equilibrium, is taken into account in a set of kinetic equations to describe simplified characters of the following two processes: (i) a cooperative formation of ion pair complexes at the interface, and (ii) supply of picrate anions and cetyltrimethylammonium cations to the interface accompanied by release of ion pair complexes to the organic phase. The numerical solutions of the present equations are shown to reproduce fairly well the characteristic properties of the oscillation of electric potential and pH such as wave forms and frequencies.

Original languageEnglish
Pages (from-to)151-158
Number of pages8
JournalBiophysical Chemistry
Issue number3
Publication statusPublished - Aug 1985
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Biochemistry
  • Organic Chemistry


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