title: Effects of halide ions on the acceptor phase in spontaneous chemical oscillations in donor/membrane/acceptor systems.
abstract: The effects of halide ions on the acceptor phase in the chemical oscillation in donor/membrane/acceptor systems were examined. The transfer of cetyltrimethylammonium (CTA(+)) ions from the donor phase and their adsorption and desorption at the membrane/acceptor interface led to spontaneous, nonlinear oscillations of the electric potential. Chloride ions stabilized the adsorption of CTA(+) ions and gave rise to a large-amplitude, long-interval, and a long relaxation-time constant. On the contrary, iodide ions, which are more hydrophobic than chloride ions, demonstrated opposite results. This mechanism was proposed based on the simultaneous time-resolved measurements of the interfacial tensions at both the donor/membrane and membrane/acceptor interfaces and observation of the convective flow due to Marangoni instability.
authors.affiliation: Department of Applied Chemistry and Biotechnology, Chiba University, 1-33 Yayoi, Inage, Chiba 263-8522, Japan.
authors.forename: Kazuma
authors.initials: K
authors.lastname: Goto
authors.affiliation: Department of Applied Chemistry and Biotechnology, Chiba University, 1-33 Yayoi, Inage, Chiba 263-8522, Japan.
authors.forename: Tomonori
authors.initials: T
authors.lastname: Nomoto
authors.affiliation: Department of Basic Science, The University of Tokyo, 3-8-1 Komaba, Meguro, Tokyo 153-8902, Japan.
authors.forename: Taro
authors.initials: T
authors.lastname: Toyota
authors.affiliation: Department of Applied Chemistry and Biotechnology, Chiba University, 1-33 Yayoi, Inage, Chiba 263-8522, Japan. Electronic address: fujinami@faculty.chiba-u.jp.
authors.forename: Masanori
authors.initials: M
authors.lastname: Fujinami
keywords: Cetyltrimethylammonium ions; Chemical oscillation; Halide ions; Interfacial tension; Marangoni instability; Quasi-elastic laser scattering method