High-speed tracking of fast chemical precipitations
Heterogeneous reactions taking place in aqueous phase are of interest since producing solid catalysts, crystallizing biomorphs or pharmaceutically relevant polymorphs, and yielding bottom-up made precipitate structures bear with significant importance both in applied and fundamental research. To achieve a better control on product properties, reaction kinetics and mechanisms must be taken into account especially in dynamic systems where transport processes are coupled to chemistry. Since characteristic time scale of numerous precipitation reactions falls below 1 s within relevant concentration range, unique experimental protocols are needed. Inhere we present a high-speed camera supported experimental procedure capable to determine such characteristic time scales in the range of 10 ms to 1 s. The method is validated both experimentally and by performing 3D hydrodynamic simulations.