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Author: Stommel, M. ×

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    Erratum: Production and validation of scintillating structural components from low-background Poly(ethylene naphthalate)
    (London : Inst. of Physics, 2022) Efremenko, Y.; Febbraro, M.; Fischer, F.; Guitart Corominas, M.; Gusev, K.; Hackett, B.; Hayward, C.; Hodák, R.; Krause, P.; Majorovits, B.; Manzanillas, L.; Muenstermann, D.; Pohl, M.; Rouhana, R.; Radford, D.; Rukhadze, E.; Rumyantseva, N.; Schilling, I.; Schoenert, S.; Schulz, O.; Schwarz, M.; Štekl, I.; Stommel, M.; Weingarten, J.; Hoppe, E.; Arnquist, I.; Hobbs, K.; French, A.; diVacri, M.; Laubenstein, M.; Zuzel, G.
    [no abstract available]
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    Experimental multi-scale approach to determine the local mechanical properties of foam base material in polyisocyanurate metal panels
    (Amsterdam [u.a.] : Elsevier Science, 2021) Gahlen, P.; Fröbel, S.; Karbach, A.; Gabriel, D.; Stommel, M.
    Polyisocyanurate (PIR) foams were examined regarding their local chemical composition using ATR-IR spectroscopy. As a special parameter the PIR: Amide III intensity ratio is to be mentioned, which represents the quantity of the formed PIR groups. Based on the local PIR: Amide III intensity ratio, the mechanical properties (Young's modulus) of the foam base material were analyzed at defined positions by AFM and Nanoindentation. It turned out that the AFM method is only suitable for qualitative analysis, because the values differ strongly from macroscopic measurements. For the measurements using nanoindentation, a new embedding method was developed, which achieves significantly more realistic and reproducible results compared to the embedding method used in the literature and shows a very good agreement with the macroscopic values. In general, it has been shown that a higher PIR: Amide III intensity ratio tends to lead to a higher Young's modulus. Nevertheless, there are other, currently unknown characteristic values which also influence the Young's modulus.
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    Beamline-implemented stretching devices for in situ X-ray scattering experiments
    (Bristol : IOP Publ., 2022) Euchler, E.; Sambale, A.K.; Schneider, K.; Uhlig, K.; Boldt, R.; Stommel, M.; Stribeck, A.; Schwartzkopf, M.; Rothkirch, A.; Roth, S.V.
    Two recently developed experimental devices for investigating soft matter deformation are presented. Both devices exploit the capabilities of a modern synchrotron beamline to enable advanced and highly precise materials-science experiments in which X-ray scattering is registered. The devices can be operated both in monotonic as well as cyclic mode and are implemented into a beamline at DESY, Hamburg (Germany). Hence, relevant experimental parameters, such as displacement, force and temperature, are recorded synchronously with the individual X-ray scattering patterns. In addition, spatial variation of materials deformation can be monitored and recorded with optical microscopy. This unique sample environment enables in situ X-ray experiments in transmission, i.e. small- or wide-angle X-ray scattering (SAXS or WAXS), and in grazing-incidence geometry, i.e. grazing-incidence (GI-) SAXS or WAXS. One device with stepper motors is designed for studies of slow, (quasi-) static deformation and the other one with pneumatic actuators can be used for fast, impact deformation. Both devices are available to external beamline users, too.