The Effect of Light on the Bray−Liebhafsky Reaction

Abstract

The effect of light on the Bray-Liebhafsky oscillatory reaction was studied at 55°C. It was found that both the induction time and period decreased with the increasing light intensity, and at a critical value of intensity, dependent on the initial concentration of the reactants, oscillation disappeared. The reaction scheme proposed by Schmitz was extended with a direct reaction of I 2 with H 2 O 2 . By taking into account the latter reaction, the oscillations were numerically calculated and good agreements with the experimental data were found.

Study of the autocatalytic chlorate–triiodide reaction in acidic and neutral media

“…(4). In fact, I 2 O is reported to exist as an important intermediate during the reaction of I 2 and H 2 O 2 [29]. Similar to a previous report [18], chlorate reacts next with I 2 O to produce HIO and HIO 2 , as shown in Eq.…”

“…Moreover, there is no need for iodide to come from the hydrolysis of iodine since a surplus of iodide ions already exist in the medium. Hence, we assume that there is a direct reaction between triiodide (or favourably iodine) and chlorate similar to that between iodine and hydrogen peroxide [29]. Based on the above discussion, the following mechanism may be eligible for the reaction of chlorate and iodine:…”

Numerical Simulation of the Behaviors of the Bray-Liebhafsky Oscillating Chemical Reaction by a Four-variable Model

“…Although a large number of works [11][12][13][14] devoted to the mechanism of the BL reaction for a long time, the overall mechanism has still not been elucidated, and is complicated by the fact that the system is also sensitive to light [15], pressure and stirring [16,17], microwaves [18,19] and oxygen [20,21]. It seems to be too difficult to obtain enough relevant information on the kinetics of this system.…”

Chemical wave studies in the bromate–pyrocatechol beads system

“…Spiral waves in a chemical system were first observed in the BZ reaction 2. In the past three decades, the BZ reaction has become one of the most widely investigated model systems for studying wave patterns because of its inexpensive compounds, easy preparation process, and easy detectability of wave patterns by applying different catalysts such as ferroin, light‐sensitive Ru(bpy), or Fe[batho(SO 3 ) 2 ] 16–21. Müller et al studied the effect of short light impulses on meandering spiral wave in the BZ reaction with Ru(bpy) 2+ 3 as catalyst and malonic acid as organic substrate 22.…”