Chemical fronts

As an example of chemical front instability consider a simple cubic autocatalytic reaction, A + 2B 3B, occurring in... 

Novellino A, Scelfo B, Palosaari T, Price A, Sobanski T, Shafer TJ, Johnstone AF, Gross GW, Gramowski A, Schroeder O, Jugelt K, Chiappalone M, Benfenati F, Martinoia S, Tedesco MT, Defranchi E, D Angelo P, Whelan M (2011) Development of micro-electrode array based tests for neurotoxicity assessment of interlaboratory reproducibility with neuro-active chemicals. Front Neuroeng 4 4... 

Because 8 3 is the water saturation at the chemical front of Q, their specific velocities must be the same, resulting in... 

Williams Haynes, The Chemical Front (New York A. Knopf, 1943). 

Transient Turing-like patterns in PA-MBO reaction (Polyacrylamide-methylene blue-sulphide-oxygen) system are obtained. Non-Turing stationary patterns in FIS reaction (Hexacyanoferrate (Il)-iodate-sulphite system) are obtained using an experimental technique similar to that used in CIMA reaction. These patterns develop through propagation of chemical fronts from the initial perturbation [54],... 

A variety of spatial structures such as chemical fronts or waves, periodic precipitates and regular spatial patterns at liquid interfaces have begun to be investigated since the first experiments on the formation of chemical spatial... 

This concept is best understood in the context of simple mathematical models in which the propagation and control processes can be closely examined. Fortunately, such simple models exist, and there is ample evidence of their relevance to real pattern-forming reagents. The idea of a modulated chemical front was present already in the work of Ostrovskii and Yahno (1975), as well as in the independent work of Ortoleva and Ross (1975) and Fife (1976). 

In this lecture we present an overview of some recent results on tenporal and spatial structures in chemical systems far from equilibriumo We discuss experiments on multiple stationary states (hi- and tristabilities), hysteresis of mstable stationary states, limit cycles, generation of limit cycles by periodic external perturbations, regular and Hopf bifurcations, chemical fronts, time-independent spatial structures and periodic precipitation processes. 

We turn next to chemical fronts and waves (for some representative experimental and theoretical articles on this subject see [7-10]). We have developed a technique for the qioantitative measurement of propagating cherrLcal profiles in reaction systems far from equilibrium [10], The measurements are made on circular waves in a thin layer of quiescent but excitable solution of the Belousov-Zhabotinsky reaction by means of light absorption of ferroin. Wave initiation is achieved by the application of a voltage pulse to wire electrodes dipped into the solution. 

Chemical Front Propagation Initiation and Relative Stability... 

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