Mass Transfer in Thin Layers

Mass transfer and molecular diffusion in thin layers play an important role in many research fields, including paints, foils for LCDs, solar foils, and medical applications. The objective of this work is to explore the diffusion behavior's impact on physical and chemical properties of polymer systems. The methodology involves the use of Inverse-Micro-Raman-Spectroscopy (IMRS) for localized, contact-free detection of chemical compositions in multi-component mixtures. Experimental results demonstrate the capability to measure concentration profiles in thin layers with high temporal, spatial, and quantitative resolution. Additionally, the study constructs extended experimental apparatus for precise measurements of multi-component diffusion under controlled conditions. Findings indicate that mass transfer interactions significantly influence the quality of high-quality products such as optical foils, revealing that existing model theories fail to account for these interactions comprehensively. Therefore, the work aims to develop new model approaches and material data to enhance understanding in the field. This contribution also outlines future experimental developments that can further advance research on mass transfer in thin layers.