Browsing by Author "Blandamer, Michael J."

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    Analysis of the Dependence on Temperature of the Frequency of Oscillation of the Belousov-Zhabotinskii Reaction
    (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1977, 73 (07), 1977) Blandamer, Michael J.; Roberts, David L.
    The frequency of oscillation of the Belousov-Zhabotinskii reaction (oxidation of malonic acid by bromate ions in acidified solution containing cerium ions) depends on the initial concentration of reactants, but in each case, a plot of log (frequency) against reciprocal temperature is linear. The calculated activation energies for eight solutions cover a relatively small range. These findings are examined in the light of proposed reaction schemes. Calculations indicate that the frequency is controlled to a significant extent by the rate of reaction between bromide and bromate ions to form HOBr and HBrO2.
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    Response of the Belousov-Zhabotinskii Oscillating Reaction to Addition of either Bromide or Cerium(IV) Ions
    (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1977, 73 (10), 1977) Blandamer, Michael J.; Roberts, David L
    When the Belousov–Zhabotinskii oscillating reaction is perturbed by rapid addition of bromide ions, the oscillations disappear but then recover. The time taken for this recovery depends on the extent of concentration perturbation, but the new frequency and amplitude of oscillation closely resemble the frequency and amplitude before perturbation. These observations show that this oscillating chemical reaction follows a limit cycle type of behaviour. A similar pattern is observed when solutions containing cerium(IV) ions are rapidly added to the oscillating reaction, although there is a more marked change in frequency and amplitude. The experimental results are compared with the results obtained from a numerical analysis of the effects of similar perturbations on the oscillations for two model schemes of oscillating reactions.