Abstract
A sufficient stream of nitrogen or oxygen bubbled into the oscillating Bray−Liebhafsky (BL) reaction system can suppress oscillations at ambient pressure. A significant stirring effect is observed, and it is confirmed that rapid stirring can cause the oscillatory state to be inhibited. It is shown that the rate of interphase transport of I2 can be greatly influenced by both bubbling and stirring changes. The total iodine concentration in the solution can be significantly depleted in such a way, and the value of the pseudo rate constant kobs = 3.2 × 10-4 s-1 for the I2 removal is determined to be crucial in our set up at 50 °C. This critical value of the rate constant corresponds to the mass-transfer coefficient ktr = 1.60 × 10-3 cm s-1. We suggest that the rate of transport of volatile iodine from the BL solution to the gas phase may be a significant component of the overall mechanism of the BL oscillations.
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