SIMULATIONS OF THE IODINE INTERPHASE TRANSPORT EFFECT ON THE OSCILLATING BRAY-LIEBHAFSKY REACTION

The effect of the iodine interphase transport originated from physical processes, such as pressure decrease, vigorous stirring, and/or an in ert gas bubbling, on the dynamics of the oscillating Bray-Liebhafsky r eaction is studied. Some new experiments were made at 60 degrees C tha t confirmed the possibility of suppressing oscillations by means of th e iodine vapor removal from the reaction solution. It has been proved that the iodine vaporization is governed by the first-order kinetics w ith respect to the concentration of aqueous iodine, and a critical rat e constant for iodine escape causing inhibition of the oscillatory mod e was determined. The experiments were confronted with the models prop osed by Kolar-Anic and Schmitz with co-workers. Both the models studie d reflect the observed phenomenon. A simulation based on the latest mo del shows very good semiquantitative agreement with experiment, needin g only a minor modification of the rate constants suggested by Kolar-A nic et al.