Experimental study of a crossover from nonclassical to classical chemical kinetics: An elementary and reversible A+B⇆C reaction-diffusion process in a capillary
Abstract
We study an elementary and reversible A+B⇆C reaction-diffusion process with initially separated reagents, in a convectionless capillary, using an inorganic chemical reaction. We show that the dynamics of the system can be described in terms of a crossover between an ``irreversible regime'' and a ``reversible regime.'' We measured the critical exponents in both regimes. In the irreversible regime we demonstrate the nonclassical phenomena of reactant segregation and depletion-zone formation. In the reversible regime we observed the effect of a local equilibrium where the classical prediction is confirmed. The experimental results are in good agreement with values predicted by theory and simulation.
- Publication:
-
Physical Review E
- Pub Date:
- September 1996
- DOI:
- 10.1103/PhysRevE.54.2447
- Bibcode:
- 1996PhRvE..54.2447Y
- Keywords:
-
- 05.70.Ln;
- 82.40.-g;
- Nonequilibrium and irreversible thermodynamics;
- Chemical kinetics and reactions: special regimes and techniques