Title

Video-Based Kinetic Analysis of Period Variations and Oscillation Patterns in the Ce/Fe-Catalyzed Four-Color Belousov-Zhabotinsky Oscillating Reaction

Abstract

The development of a video-based method for the measurement of the kinetics of oscillating reactions is described in this chapter. The method mimics reflection ultraviolet-visible spectroscopy and allows for simultaneous measurement at any target color (RC, GC, BC) with a temporal resolution of 0.01 s. The image analysis results in discrete time traces [DCC(t, RC, GC, BC)], and numerical methods are described for the analysis of the quasiperiodic oscillation patterns over the course of the reactions to determine period lengths PT(t) and other parameters [oxidation times OT(t), reduction times RT(t), etc.] that characterize the redox chemistry of the catalysts within each period. The methods were demonstrated with studies of the Ce/Fe-catalyzed four-color Belousov-Zhabotinsky reactions. The temporal evolution of period and pattern characteristics are described with polynomials, and values measured for reaction times of approximately 500 and 2000 s are discussed to highlight the temporal changes. The measurements provide a wealth of constraints to determine chemically reasonable reaction models. The discovery of the Bactrian-type oscillation pattern of ferriin in the four-color Belousov-Zhabotinsky reactions is a key result of the present study: the concentration of Fe 3+ goes through two maxima in every period.

Department(s)

Chemistry

Comments

This research was supported by the National Science Foundation (PRISM 0928053; CHE 0051007), and we acknowledge the donors of the American Chemical Society Petroleum Research Fund for partial support of this research (PRF-53415-ND4).

Keywords and Phrases

Color; Numerical methods; Redox reactions; Ultraviolet visible spectroscopy, Belousov-Zhabotinsky reactions; Concentration of fe; Oscillating reactions; Oscillation patterns; Pattern characteristic; Quasiperiodic oscillations; Simultaneous measurement; Temporal resolution, Chemical analysis

International Standard Book Number (ISBN)

978-084123435-2

International Standard Serial Number (ISSN)

0097-6156;1947-5918

Document Type

Book - Chapter

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2019 American Chemical Society (ACS), All rights reserved.

Publication Date

01 Apr 2019

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