scholarly journals Oscillations of EPR Signals Accompanying Belousov–Zhabotinsky Reaction

2020 ◽  
Vol 7 (1) ◽  
pp. 2
Author(s):  
Roman Morgunov ◽  
Yoshifumi Tanimoto
Keyword(s):  
Inhomogeneous Magnetic Field ◽  
Front Velocity ◽  
Paramagnetic Centers ◽  
Simulated Spectrum ◽  
Epr Spectrum ◽  
Bz Reaction ◽  
Chemical Oscillations ◽  
Fixed Concentration ◽  
Oscillating Reaction ◽  
Belousov Zhabotinsky Reaction

Periodical transformation of ferroin to ferriin is accompanied by changes in magnetic properties of liquids during Belousov–Zhabotinsky (BZ) reaction malonic acid, sodium bromide, sodium bromate, ferroin, and sulfuric acid. Instead of the earlier studied oscillation of microwave conductivity accompanying an oscillating reaction, we propose a flash technique to interrupt the BZ reaction by rapid freezing. Rapid cooling of a solution during chemical oscillations results in a frozen system with a fixed concentration of paramagnetic centers Fe3+. EPR spectrum recorded at different stages of the interrupted reaction corresponds to the exact concentration of the ferroin and ferriin components. Following unfreezing unblocks the BZ reaction, and oscillations are still observed. A simulated spectrum allows one to distinguish two groups of Fe3+ ions of different symmetries. The obtained results are important to explain the earlier observed effect of inhomogeneous magnetic field on BZ reaction front velocity.

PERIOD-DOUBLING GEOMETRY OF THE BELOUSOV-ZHABOTINSKY REACTION DYNAMICS

1996 ◽  
Vol 06 (07) ◽  
pp. 1267-1279 ◽  
Author(s):  
JICHANG WANG ◽  
F. HYNNE ◽  
P. GRAAE SØRENSEN
Keyword(s):  
Stable Manifold ◽  
Period Doubling ◽  
Quantitative Information ◽  
Stable And Unstable Manifolds ◽  
Bz Reaction ◽  
Positive Orthant ◽  
Model Independent ◽  
Unstable Manifolds ◽  
Belousov Zhabotinsky Reaction ◽  
Concentration Space

The intricate geometry of stable and unstable manifolds of a saddle cycle arising from a super-critical period-doubling bifurcation is explored experimentally for the Belousov-Zhabotinsky (BZ) reaction in a CSTR (Continuous flow Stirred Tank Reactor). We find clear experimental evidence that the stable manifold winds round the stable period-doubled orbit arising at the bifurcation. The stable manifold is probed experimentally by perturbations from the period-doubled limit cycle. The method provides a model-independent experimental test for species essential for the complexity, as well as quantitative information about the geometry of the limit cycles, the associated manifolds, and their embedding in the concentration space. The results are supported by simulations of the experiments with a four-dimensional model of the BZ reaction. Here stable manifold has several branches showing some tendency of curling. However the branches may end on the boundary of the positive orthant of the concentration space.

New chaotic behavior and its effective control in Belousov–Zhabotinsky reaction

2001 ◽  
Vol 79 (1) ◽  
pp. 29-34
Author(s):  
Yan-Ni Li ◽  
Hao Song ◽  
Zun-Sheng Cai ◽  
Lan Chen ◽  
Zhe Hou ◽  
...  
Keyword(s):  
Continuous Flow ◽  
Mixed Mode ◽  
Chaos Control ◽  
Chaotic Behavior ◽  
Stirred Tank ◽  
Effective Control ◽  
Control Methods ◽  
Bz Reaction ◽  
Tank Reactor ◽  
Belousov Zhabotinsky Reaction

A new "spiral-in-to-spiral-out" mixed-mode type chaos of the Belousov–Zhabotinsky (BZ) reaction in a continuous flow stirred tank reactor (CSTR) is observed. We discussed its evolution and characterization in detail. We controlled the new chaos into steady periodic behavior by two control methods: (i) a self-adaptive delayed feedback controlling scheme; and (ii) a linear self-interacting feedback controlling scheme.Key words: BZ-CSTR reaction, chaos, control.

scholarly journals Spatial and temporal dynamics of Belousov-Zhabotinsky reaction: A STEM approach

2020 ◽  
Vol 17 (2 Jul-Dec) ◽  
pp. 178
Author(s):  
J. A. Arzola Flores ◽  
E. García García ◽  
J. F. Rojas Rodríguez ◽  
R. Murueta Fortiz ◽  
G. Corona Morales ◽  
...  
Keyword(s):  
Temporal Dynamics ◽  
Teaching Science ◽  
Systemic Thinking ◽  
Bz Reaction ◽  
Experimental Reproduction ◽  
Science Technology ◽  
Spatial And Temporal Dynamics ◽  
Programming Software ◽  
Belousov Zhabotinsky Reaction ◽  
Standard Prototype

An integrative methodology for teaching science is proposed through the STEM methodology (Science-Technology-EngineeringMathematics).The STEM methodology provides students the opportunity to combine knowledge in an interdisciplinary and collaborative manner, allowing the development of creative and systemic thinking. As a model we propose the experimental reproduction of the Belousov-Zhabotinsky reaction (BZ), which is the standard prototype of non-linear chemistry, in addition we used the Python V2.7 programming software and the Jupyter platform for the computational reproduction of the BZ reaction. The STEM methodology could help the development of new competences for students, that is, it will provide them with tools to solve complex current problems that require of the interdisciplinarity

Efficiency range of the Belousov–Zhabotinsky reaction to induce the self-organization of transient bonds in metallo-supramolecular polymeric systems

2020 ◽  
Vol 22 (26) ◽  
pp. 14965-14975
Author(s):  
Mostafa Ahmadi ◽  
Sebastian Seiffert
Keyword(s):  
The Self ◽  
Self Organization ◽  
Supramolecular Polymer ◽  
Network System ◽  
Polymer Gel ◽  
Reaction Parameters ◽  
Polymeric Systems ◽  
Chemical Oscillations ◽  
Belousov Zhabotinsky Reaction ◽  
Gel Network

Although reaction parameters offer control over chemical oscillations in a transient metallo-supramolecular polymer gel network system, this does not result in a pronounced self-organization of metallo-supramolecular bonds.

Self-Oscillating Behaviors of Negatively Charged Polymer Chain Induced by the Belousov-Zhabotinsky Reaction

2011 ◽  
Vol 181-182 ◽  
pp. 206-211
Author(s):  
Yusuke Hara ◽  
Rumana A. Jahan
Keyword(s):  
Polymer Solution ◽  
Polymer Chain ◽  
Control Site ◽  
The Self ◽  
Sodium Bromate ◽  
Bz Reaction ◽  
Free Condition ◽  
Ru Catalyst ◽  
Damping Behavior ◽  
Belousov Zhabotinsky Reaction

In this paper, we studied the effect of the temperature and the initial concentration of sodium bromate (NaBrO3) on the aggregation-disaggregation self-oscillation for a polymer chain. The polymer chain consisted of N-isopropylacrylamide (NIPAAm), Ru catalyst of the BZ reaction and Acrylamide-2-methylpropanesulfonic acid (AMPS) as a solubility control site. The concentration of sodium bromate and the temperature significantly affected the self-oscillating behavior and the period of the aggregation-disaggregation self-oscillation. Moreover, the amplitude of the aggregation-disaggregation self-oscillation of the AMPS-containing polymer solution decreased with time. The damping behavior is originating from the increase in the size of the polymer chain. In addition, this study clarified that the period of the self-oscillation of the AMPS-containing polymer solution in the strongly acidic condition was significantly shorter than that in the acid-free condition.

Oxidation of Malonic Acid by Ceric Ions Subset of the Belousov-Zhabotinsky Reaction

1987 ◽  
Vol 42 (9) ◽  
pp. 963-969 ◽  
Author(s):  
H.D. Försterling ◽  
R. Pachl ◽  
H. Schreiber
Keyword(s):  
Sulfuric Acid ◽  
Malonic Acid ◽  
Reaction Rate ◽  
Primary Source ◽  
Acid Solutions ◽  
Bz Reaction ◽  
Sulfuric Acid Solutions ◽  
Belousov Zhabotinsky Reaction ◽  
Kinetics Of

The kinetics of the Ce4+-decay and the formation of CO2 are measured in sulfuric acid solutions of malonic acid. The reaction rate is slowed down by Ce3+ -ions due to a reaction of Ce3+ with malonic acid radicals. The primary source of CO2 is the decarboxylation of malonic acid radicals. Implications on the mechanism of the BZ reaction are discussed.

Turbulent pattern in the 1,4-cyclohexanedione Belousov–Zhabotinsky reaction

2020 ◽  
Vol 22 (48) ◽  
pp. 28213-28221
Author(s):  
Suparinthon Anupong ◽  
Igor Schreiber ◽  
On-Uma Kheowan
Keyword(s):  
Fourier Transform ◽  
Two Dimensional ◽  
Bz Reaction ◽  
Belousov Zhabotinsky Reaction ◽  
Chemical Turbulence

Chemical turbulence was observed experimentally in the 1,4-cyclohexanedione Belousov–Zhabotinsky (CHD-BZ) reaction. Turbulence is characterized by a two-dimensional Fourier transform. Mechanism of the onset of the turbulence is proposed.

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