Periodic change of viscosity and density in an oscillating chemical reaction

Abstract

It was found that the periodic change of the solution viscosity and density was generated in the Belousov-Zhabotinsky (BZ) reaction. This rhythmic phenomenon was observed in both the iron catalyst [[Fe(Phen)(3)](2+)-[Fe(Phen)(3)](3+)] and the cerium catalyst [Ce(III)-Ce(IV)] system, where the solution viscosity and density were synchronized with the redox potential in the in-phase mode. However, the time delay existed between the redox potential and the solution viscosity and density. The behavior of the BZ reaction was also monitored in the presence of the nonionic surfactant. This experiment revealed that, beyond the critical micelle concentration, the phase between the redox potential and the solution viscosity and density was synchronized into the antiphase mode. We suggested that the variation of the catalyst drove the oscillation of the solution viscosity and density in the BZ reaction.

Characterization of a self‐oscillating polymer with periodic soluble‐insoluble changes

“…Therefore, upper peaks of viscosity oscillation in Figure 7(b) correspond to the reduced state (bottom peaks of the redox oscillation), and bottom peaks of viscosity correspond to the oxidized state (upper peaks of the redox oscillation). This implies an antiphase coupling between redox and viscosity 18. The phase relationship between viscosity and redox potential depends on the chemical and physical properties of the BZ polymer used in the experiments.…”

A viscosity self-oscillation of polymer solution induced by the Belousov–Zhabotinsky reaction under acid-free condition

“…Recently, we succeeded in the direct observation of the self-oscillating behavior of the polymer chain immobilized on a glass plate utilizing the atomic force microscopy. 17 Therefore, we attempted to cause the autonomous large change in the solution viscosity by utilizing the self-oscillating polymer chain. [7][8][9][10][11] The self-oscillating polymer chain with a negatively charged acrylamide-2methylpropanesulfonic acid ͑AMPS͒ has a lot of potentials to control the self-oscillating behavior.…”

Influence of Micellar Propinquity on Dynamics of Ce(IV)‐Catalyzed BZ Oscillatory Reaction under Stirred Conditions

“…In addition, the variation in medium properties like surface tension, viscosity, density, and ionic strength owing to the presence of surface active agents could also affect the course of the BZ reaction. Moreover, above cmc the hydrophobic core of the micelles may entrap nonpolar species, thus influencing the kinetics of such a reaction .…”