P. Sevcik et L. Adamcikova, EFFECT OF A GAS BUBBLING AND STIRRING ON THE OSCILLATING BRAY-LIEBHAFSKY REACTION, The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory, 102(8), 1998, pp. 1288-1291
A sufficient stream of nitrogen or oxygen bubbled into the oscillating
Bray-Liebhafsky (BL) reaction system can suppress oscillations at amb
ient pressure. A significant stirring effect is observed, and it is co
nfirmed that rapid stirring can cause the oscillatory state to be inhi
bited. It is shown that the rate of interphase transport of 12 can be
greatly influenced by both bubbling and stirring changes. The total io
dine concentration in the solution can be significantly depleted in su
ch a way, and the value of the pseudo rate constant k(obs) = 3.2 x 10(
-4) s(-1) for the It removal is determined to be crucial in our set up
at 50 degrees C. This critical value of the rate constant corresponds
to the mass-transfer coefficient k(tr) 1.60 x 10(-3) cm s(-1). We sug
gest that the rate of transport of volatile iodine from the BL solutio
n to the gas phase may be a significant component of the overall mecha
nism of the BL oscillations.