Effect of a pressure decrease and stirring on the oscillating Bray-Liebhafsky reaction

A decrease in pressure from 101.3 to 26 kPa or less results in a dramatic change in the oscillation parameters in the batch Bray-Liebhafsky (BL) oscillatory system in an N2 or O2 atmosphere. It was confirmed that at 101.3 kPa the oscillations can be suppressed by rapid stirring. The experiments show that the rate of interphase transport of I2 is not negligible at 50°C and can be influenced by both stirring and pressure changes. It is indicated that the escape of I2 from the BL solution to the phase above it can significantly deplete the total concentration of iodine. We conclude that external pressure can be considered to be the bifurcation parameter which is associated with stability of the BL system.