Photoinduced Oscillations and Pulse Waves in the Hydrogen Peroxide–Sulfite–Ferrocyanide Reaction

Abstract

The hydrogen peroxide-sulfite-ferrocyanide reaction shows excellent photosensitivity under pulse light illumination, which can be used to efficiently control the spatiotemporal dynamics of the nonlinear chemical system. Here, we numerically simulated the photoinduced pH oscillations by integrating two models that describe the oscillatory and photosensitive behaviors, respectively. A dynamic transition from the low-pH steady state to oscillations can be obtained using light illumination. In accordance with the simulation results, oscillatory dynamics was experimentally obtained under light illumination through excitation of a low-pH steady state. In the reaction-diffusion medium, corresponding multiple pulse waves were observed under suitable acid concentration and illumination conditions. Hence, light illumination can be efficiently employed to tune pattern formation in pH dynamic systems. Especially, the observation indicates that the local oscillations and pulse waves were promoted by diffusion in the gel reactor when comparing with dynamics in a homogeneous system.

Modulation of spatiotemporal dynamics in the bromate–sulfite–ferrocyanide reaction system by visible light

“…[21][22][23][24][25][26] Photo-induced oscillations and pulse waves have been studied in the hydrogen peroxide-sulte-ferrocyanide (HPSF) reaction. 27 The number of oscillatory-peaks was conveniently controlled by changing the illumination period and duration. Original of the phenomena was accounted for the reversible photolysis of ferricyanide, which was followed by the protonation of newly produced cyanide.…”

Modulation Effects of Permanganate and Manganese(II) Ions on the Oscillatory Dynamics in a Bromate–Sulfite Reaction System

“…pH oscillators only account for approximately 12% of the chemical oscillatory family . Nevertheless, these reaction systems are known to exhibit abundant spatiotemporal dynamics in the different configurations of reactors, such as chemical chaos , and mixed-mode oscillations in a continuously stirred tank reactor (CSTR) as well as travelling waves and spatiotemporal patterns in a one-side-fed reactor. In addition, pH oscillators have many practical applications due to periodical changes in pH values.…”