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Title: Role of heterogeneous reactions in generating chaos and noise in oscillatory chemical reactions†
Authors: Rastogi, R P
Das, Ishwar
Srivastava, P K
Chand, Prem
Kumar, Sharwan
Issue Date: Feb-2006
Publisher: NISCAIR-CSIR, India
Abstract: In view of the importance of noise in physiology, information processing and finance, studies on chaos and noise have been undertaken. Detailed studies on the following oscillatory reactions have been undertaken: (i) thiophenol + BrO3- + H2SO4, (ii ) frutose + BrO3- + H2SO4 + Ce4+, and (iii) iodate + arsenite, which can serve as a model system for this purpose. Aperiodic oscillations have been observed in these systems. Analysis of phase plane plots yields complex attractors, which are quite different from strange attractor indicating the occurrence of random noise. Power spectra also indicate chaos with a broad band not necessarily the deterministic chaos. For the reactions (i) and (iii), a mechanism has been proposed involving precipitation of C6-H5-S-C6H5 and iodine, respectively: while in case of reaction (ii), gaseous evolution of Br2 has been invoked. Experimental studies on sedimentation of C6-H5-S-C6H5 and Br2 evolution confirm that such heterogeneous reactions play an important role in generating noise in oscillations.
Page(s): 358-364
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections: IJC-A Vol.45A(02) [February 2006]

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