Description:

"Monitoring Adsorption, Diffusion and Reaction through the Microscope: The Novel Options of Microimaging."

Abstract: After an introduction into the various types of experiments by which molecular diffusion may be recorded, special emphasis shall be given on the novel evidence on mass transfer attainable with the application of interference and IR microscopy for “microimaging”. These options include the quantitation of transport resistances on the external surfaces of the particles which in numerous cases are found to notably exceed the diffusional resistance of the genuine pore network, the measurement of intracrystalline diffusivities with unprecedented reliability as a standard for predictions by molecular modelling, transport assessment in pore space hierarchies, the simultaneous observation of the fluxes of different components including “uphill” diffusion and “overshooting” and the recording of transient concentration profiles with the option of the one-shot determination of the effectiveness factor of chemical reactions.