Abstract
We study experimentally the $A+2B\ensuremath{\rightarrow}C$ reaction-diffusion process with initially separated reagents in a capillary using an inorganic chemical reaction. We measure and compare with theory the dynamic quantities that characterize the kinetic behavior of the system: the global reaction rate $R(t),$ the location of the reaction center ${x}_{f}(t),$ the front's width $w(t),$ and the local production rate ${R(x}_{f},t).$ We demonstrate the nonclassical phenomena of reactant segregation and depletion-zone formation for this reaction-diffusion process. The experimental results are in good agreement with theory and simulation and quite different from the exponents for the elementary binary $A+B\ensuremath{\rightarrow}C$ reaction. The time exponents are 0.27 for the width, -0.48 for the global reaction rate, and -0.75 for the local reaction rate, compared to theoretical values of 0.25, -0.5, and -0.75, respectively.
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