Lantos Emese, Tóth Ágota, Horváth Dezső
Department of Physical Chemistry and Materials Science, University of Szeged, Rerrich Béla tér 1., Szeged H-6720, Hungary.
Department of Applied and Environmental Chemistry, University of Szeged, Rerrich Béla tér 1., Szeged H-6720, Hungary.
Chaos. 2023 Oct 1;33(10). doi: 10.1063/5.0169860.
We have built an autocatalytic reaction network, based on the hydrolysis of certain imines, which exhibits bistability in an open system. The positive feedback originates from the interplay of fast acid-base equilibria, leading to hydroxide ion production, and pH-dependent hydrolysis rates. The addition of a first-order removal of the autocatalyst can result in sustained pH oscillations close to physiological conditions. The unit-amplitude pH oscillations are accompanied by the stoichiometric conversion of imine into amine back and forth. A systematic parameter search is carried out to characterize the rich observable dynamics and identify the evolving bifurcations.
