600-31-7Relevant articles and documents
PREREQUISITE FOR OSCILLATORY BEHAVIOUR IN THE MALONIC ACID, BROMATE AND CATALYST REACTING SYSTEMS.
Burger,Koros
, p. 363 - 366 (1980)
The role of bromomalonic acid was investigated in Belousov-Zhabotinsky systems, in the preoscillatory period. It was established that the crucial bromomalonic acid concentration (at which the trasition from non-oscillatory behavior to the oscillatory one occurs) depends on the initial reactant concentrations. This relationship is closely connected to the rate equation describing the formation of bromomalonic acid in the preoscillatory period. On the basis of the solution of the rate equation the crucial bromomalonic acid concentration can be calculated. From the temperature dependence of the rate constants, the activation energy of the bromomalonic acid formation during the preoscillatory period was calculated.
Perturbation mechanism and phase transition of AOT aggregates in the Fe(II)[batho(SO3)2]3 - catalyzed aqueous Belousov-Zhabotinsky reaction
Jahan, Rumana A.,Suzuki, Kosuke,Mahara, Hitoshi,Nishimura, Satoshi,Iwatsubo, Takashi,Kaminaga, Akiko,Yamamoto, Yasuhiko,Yamaguchi, Tomohiko
, p. 304 - 308 (2010)
Surfactant AOT (sodium bis(2-ethylhexyl)sulfosuccinate) was introduced up to 200 mmol L-1 in the aqueous Belousov-Zhabotinsky (BZ) medium. Both the induction period (IP) and the oscillation period (τ) of the BZ waves decreased significantly, whereas the wave velocity (v) increased with the concentration of AOT. These tendencies were explained in terms of the perturbations to the FKN mechanism through the uptake of Br2 and BrO2· into the hydrophobic core of AOT aggregates. In addition, the structures and the phase transition of AOT aggregates were suggested based on the measurement of surface tension and the correlation analysis of the IP, τ and v values.
The Potentiometric Effect of As(III) Ion on a Belousov-Zhabotinskii Oscillating Chemical Reaction. Application to the Determination of As(III)
Ojani, Reza,Raoof, Jahanbakhsh,Mahdavi, Fathemeh
, p. 2117 - 2121 (2003)
A novel analytical method that builds on specific features of non-linear chemical systems far from thermodynamic equilibrium is described. The used oscillating chemical system is the BZ (Belousove-Zhabotinskii) reaction in a non-equilibrium stationary state close to a bifurcation point. The method uses a Pt electrode for monitoring the potential response to a perturbation caused by As(III) ion. A linear response, in which the oscillating amplitude varies versus the logarithm of the As(III) concentration, was found in the range of 1.99 * 10-6-1.27 * 10-4 M. Under optimum conditions, a detection limit of 2 * 10-6 M for As(III) was obtained. The relative standard deviation (%RSD) for As(III) 1.59 * 10-5 M is 7.1 (n = 6).
Stoichiometry of Bromide Production from Ceric Oxidation of Bromomalonic Acid in the Belousov-Zhabotinskii Reaction
Foersterling, Horst-Dieter,Stuk, Linda,Barr, Alexander,McCormick, William D.
, p. 2623 - 2627 (1993)
We investigated the number of Ce4+ ions required to produce one Br- ion in the oxidation of bromomalonic acid by Ce4+ under conditions appropriate to the oscillating Belousov-Zhabotinskii (BZ) reaction.We found a ratio of 1:1, in agreement with earlier results by Jwo and Noyes (J.Am.Chem.Soc. 1975, 97, 5422), in the presence of oxygen.With oxygen excluded from the system, we found a ratio of 2:1.The presence of malonic acid in the system had no effect on the bromide production, contrary to the assumption of recent theoretical models of the Belousov-Zhabotinskii reaction.
Deuterium isotope effect on the induction period of the cerium catalyzed Belousov-Zhabotinsky reaction
Rossi, Federico,Simoncini, Eugenio,Marchettini, Nadia,Tiezzi, Enzo
, p. 147 - 150 (2009)
In this work we present results about the deuterium isotopic effect on the global kinetics of a cerium catalyzed Belousov-Zhabotinsky reaction. A nonlinear dependence of the induction period upon the percentage of deuterated reactants was found in batch conditions. In order to understand this result, we investigated two reaction pathways responsible for the length of the induction period, namely: (a) the reaction between the enolic form of the malonic acid with molecular bromine and (b) the oxidation of malonic acid by the Ce(IV) ion. In both cases we obtained a linear dependence of the kinetic constants on the percentage of deuterated reactants. Nevertheless, by inserting the experimental values in the MBM (Marburg-Budapest-Missoula) model, we were able to qualitatively simulate the observed trend of the induction period.
Malonic acid concentration as a control parameter in the kinetic analysis of the Belousov-Zhabotinsky reaction under batch conditions
Blagojevic, Slavica M.,Anic, Slobodan R.,Cupic, Zeljko D.,Pejic, Natasa D.,Kolar-Anic, Ljiljana Z.
, p. 6658 - 6664 (2008)
The influence of the initial malonic acid concentration [MA]0 (8.00 × 10-3≤ [MA]0≤ 4.30 × 10 -2 mol dm-3) in the presence of bromate (6.20 × 10-2 mol dm-3), bromide (1.50 × 10-5 mol dm-3), sulfuric acid (1.00 mol dm-3) and cerium sulfate (2.50 × 10-3 mol dm-3) on the dynamics and the kinetics of the Belousov-Zhabotinsky (BZ) reactions was examined under batch conditions at 30.0°C. The kinetics of the BZ reaction was analyzed by the earlier proposed method convenient for the examinations of the oscillatory reactions. In the defined region of parameters where oscillograms with only large-amplitude relaxation oscillations appeared, the pseudo-first order of the overall malonic acid decomposition with a corresponding rate constant of 2.14 × 10-2 min-1 was established. The numerical results on the dynamics and kinetics of the BZ reaction, carried out by the known skeleton model including the Br2O species, were in good agreement with the experimental ones. The already found saddle node infinite period (SNIPER) bifurcation point in transition from a stable quasi-steady state to periodic orbits and vice versa is confirmed by both experimental and numerical investigations of the system under consideration. Namely, the large-amplitude relaxation oscillations with increasing periods between oscillations in approaching the bifurcation points at the beginning and the end of the oscillatory domain, together with excitability of the stable quasi-steady states in their vicinity are obtained. the Owner Societies.
Quantitative Measurement of Intermediate Species in Sustained Belousov-Zhabotinsky Oscillations
Vidal, C.,Roux, J. C.,Rossi, A.
, p. 1241 - 1245 (1980)
Sustained Belousov-Zhabotinsky oscillations have been performed in an open continuous-fed reactor, controlled by a computer.A procedure of repeated storage and accumulation of the signal given by any kind of detector allows the identification of several intermediate species and their concentration measurement with a good accuracy.By means of spectrophotometric as well as potentiometric techniques we have so obtained the concentration time dependence of Ce3+, Ce4+, Br2, Br-, bromomalonic compounds (BrMA), O2, and CO2.These species cannot account for the overall ligh t absorption in the UV range (280-320nm), so that at least another one, which we could not identify, is involved.A detailed analysis of our experimental results points out for a general agreement with the mechanism already proposed by Field, Koeros, and Noyes.
Experimental Study of Spiral Waves in the Ce-Catalyzed Belousov-Zhabotinskii Reaction
Nagy-Ungvarai, Zs.,Tyson, J. J.,Mueller, S. C.,Watson, L. T.,Hess, B.
, p. 8677 - 8682 (1990)
Systematic measurements of spiral wave characteristics (rotation period, normal velocity, wavelength, and wave form) in the cerium-catalyzed BZ reaction were carried out over a wide range of reagent concentrations.These data provide a stringent test for theoretical models of the reaction.Numerical calculations of spiral wave solutions to modified Oregonator equations are in satisfactory agreement with the experimental results.
Optical Communication among Oscillatory Reactions and Photo-Excitable Systems: UV and Visible Radiation Can Synchronize Artificial Neuron Models
Gentili, Pier Luigi,Giubila, Maria Sole,Germani, Raimondo,Romani, Aldo,Nicoziani, Andrea,Spalletti, Anna,Heron, B. Mark
, p. 7535 - 7540 (2017/06/13)
Neuromorphic engineering promises to have a revolutionary impact in our societies. A strategy to develop artificial neurons (ANs) is to use oscillatory and excitable chemical systems. Herein, we use UV and visible radiation as both excitatory and inhibitory signals for the communication among oscillatory reactions, such as the Belousov–Zhabotinsky and the chemiluminescent Orban transformations, and photo-excitable photochromic and fluorescent species. We present the experimental results and the simulations regarding pairs of ANs communicating by either one or two optical signals, and triads of ANs arranged in both feed-forward and recurrent networks. We find that the ANs, powered chemically and/or by the energy of electromagnetic radiation, can give rise to the emergent properties of in-phase, out-of-phase, anti-phase synchronizations and phase-locking, dynamically mimicking the communication among real neurons.
