A New Chemical Oscillator in a Novel Open Reactor: The ClO2-I2-Acetone System in a Membrane Fed Stirred Tank Reactor

Platinum as a Chlorine Dioxide/Chlorite Redox Electrode in ClO2-Based Oscillating Reactions and a New Semibatch Oscillator: The ClO2−Acetone System with I- Inflow

“…The CIA System with Iodine Inflow: Experiments and Modeling. First we repeated the experiment of Marlovits et al, 1 but now more precautions were taken in measuring the electrode potential. The electrolyte in the reference electrode, the salt bridge, and the silicon grease inside the flexible Tygon tubing were refreshed every day.…”

“…Apparatus. The experimental setup was the same as used earlier by Marlovits et al 1 In the MSTR experiments the same iodine permeator was applied, generating a constant iodine current of 2.5 × 10 -8 M s -1 . In the new version of the CIA oscillator the iodide inflow was controlled by a peristaltic pump (Ismatec REGLO 4/8 with a tubing of 0.19 mm inner diameter) applying low flow rates (usually below 0.1 mL/min).…”

“…[1][2][3][4][5][6][7][8][9][10][11][12][13] Recently a new ClO 2 -based chemical oscillator, the ClO 2 -I 2 -acetone (CIA) system, was found in our laboratory. 1 Oscillations were observed in a novel semibatch reactor called a membrane-fed stirred tank reactor (MSTR), in which a constant iodine inflow permeating through a selective membrane generated potential oscillations of platinum and iodide selective electrodes. Model calculations based on a combination of the Citri-Epstein 4 and the Lengyel-Rábai-Epstein 6 (LRE) mechanisms resulted in a qualitative agreement with the observations: both the period and the duration of the calculated oscillations were rather close to the experimental values.…”

“…However, the amplitudes of potential oscillations of a platinum electrode calculated from the concentrations of the I 2 /Iredox couple were different from those recorded in the experiments. In our previous work 1 no attempts were made to explain the absolute potential level of the electrodes, since it was realized that a careful calibration for the possible electroactive species was needed. These electrochemical investigations were postponed for a separate study, which is reported here.…”

Dynamical equivalence and linear conjugacy of biochemical reaction network models

“…Being able to produce all the important qualitative dynamical properties like stable and unstable equilibria, multiple equilibria, bifurcation phenomena, oscillatory and even chaotic behaviour (Epstein and Pojman, 1998), CRNs "have become a prototype of nonlinear science" (Érdi and Tóth, 1989). Many of these phenomena have been actually observed in real chemical experiments where the practical constraints are much more severe than in the case of mathematical models (Noszticzius and Bódiss, 1980;Marlovits et al, 1995). This 'dynamical richness' of the model class explains that CRNs have attracted significant attention not only among chemists but in numerous other fields such as physics, or even pure and applied mathematics where nonlinear dynamical systems are considered.…”