2023/07/04 by Peter Thissen, Jonas Wohlgemuth, Peter G. Weidler +6 · 1 voice · 1 citation
Chemistry · Engineering · Materials Science · #Block Copolymer Self-Assembly #Enhanced Oil Recovery Techniques #Metal-Organic Frameworks: Synthesis and Applications
paper · pdf · doi:10.1002/adfm.202301535
openalex publication_date 2023/07/04 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
Abstract Many properties of the emerging class of metal‐organic frameworks (MOFs) depend crucially on defect concentrations, as in case of other solids. In order to provide reference systems with nearly perfect structure and low defect density, a procedure to grow MOFs epitaxially on cm‐sized Si(111) single crystals is developed. The crystalline metal‐organic thin films are in high registry with the substrate's crystal lattice, as demonstrated by synchrotron‐based grazing incidence X‐ray diffraction (GI‐XRD) experiments. The corresponding reduction of MOF defect density is shown to have striking effects on the properties of these porous frameworks. The most pronounced difference concerns mass transport. An increase in the diffusion coefficient of guest molecules by one order of magnitude relative to the same MOF materials with normal defect densities is observed.