University of Cambridge > > Institute for Energy and Environmental Flows (IEEF) > SPECIAL SEMINAR - Drying, Diffusion and Interdiffusion in Multicomponent and Multilayer Films

SPECIAL SEMINAR - Drying, Diffusion and Interdiffusion in Multicomponent and Multilayer Films

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Film drying processes of multicomponent and multilayer polymeric films play and important role in many applications and processes, such as surface coatings, membranes, adhesives, optical films, battery electrodes, catalyst coated layer for PEM FC and WE, printed multilayer structures and additive manufacturing. After liquid coating, drying, diffusion, interdiffusion, migration have impact on microstructure, distribution and functionality of the final product. Mass transport and diffusion are often a crucial factor. Despite the huge practical relevance, multimaterial drying, mass transport and inter)diffusion is experimentally and by modeling not sufficiently well investigated, often not proper or too complicated described and understood. In practice there are almost no experimental data to describe this properly. One main reason is the lack of experiments in multicomponent systems for experimentally validated theoretical descriptions of multicomponent diffusion. Inverse Micro Raman Spectroscopy (IMRS) offers in-situ measurement of solvent and polymer distribution in thin films during drying with a high spatial and quantitative resolution of all components. Experiments are performed in situ in thin films while applying well-defined boundary conditions and measuring local concentrations of components at different positions within the sample. The influence of different multicomponent material systems will be discussed in different studies. Numerical new model-based description of the multi-component mass transport will be presented. Models were validated for different polymer and solvent systems. Influence of solvent content and molar mass of polymers on the interdiffusion in multilayer systems was studied. It could be shown that interdiffusion lengths strongly correlates with solvent content and polymer mass. The model was verified for different material systems.Investigation on different material systems and the influence of glass transition were performed at drying of thin Nanofilms towards high Deborah numbers with in situ QCM measurements. The accuracy of the drying curve measurements was below 0,1 nm thickness changes during in situ drying. Relaxation kinetic effects dominates diffusion kinetic effects, this can be shown by changing the Deborah number in the different experiments towardsNano-Thin films.

This talk is part of the Institute for Energy and Environmental Flows (IEEF) series.

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