Institute of Solid State Physics
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SS23 WS23 SS24 WS24 SS25 Guidelines for Master Students
Influence of pore-confined water on the thermal expansion of a zinc-based metal-organic framework Metal-organic frameworks (MOFs) consist of metal nodes that are connected through organic linkers forming a porous network. While certain MOFs may collapse upon minimal water uptake, others possess remarkable stability upon water exposure allowing to harvest water from atmospheric moisture. Here, we are primarily interested in the anharmonicities of the potential energy surface of loaded structures, typically assessed through thermal expansion. A Zn-based MOF that remains stable in the presence of humid air is GUT-2, developed at Graz University of Technology. To measure the thermal expansion of the activated and hydrated form of GUT-2, temperature-dependent PXRD experiments over a wide temperature range from -190°C to 250°C were performed in collaboration with the company Anton Paar. In the course of experiments, we also obtained insight into the kinetics of water ad-/desorption. |
