Dresden 2020 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 2: Focus: Soft Matter and Nanocomposites - New opportunities with advanced neutron sources I
CPP 2.4: Vortrag
Montag, 16. März 2020, 10:30–10:45, ZEU 222
Evanescent wave simulations: challenges and opportunities for the interpretation of grazing incidence scattering experiments — •Tetyana Kyrey1, Marina Ganeva1, Judith Witte2, Regine von Klitzing3, Stefan Wellert2, and Olaf Holderer1 — 1Forschungszentrum Jülich GmbH, JCNS am MLZ, Germany — 2TU Berlin, Germany — 3TU Darmstadt, Germany
Grazing incidence small angle neutron scattering (GISANS) and grazing incidence neutron spin-echo spectrometry (GINSES) are a powerful experimental method for the investigation of the structure and dynamics of adsorbed polymer systems. Neutron scattering provides access to the internal dynamics. Combination of neutron spin-echo spectrometry with grazing incidence geometry opens the possibility to probe dynamics of the polymer system in vicinity to the solid substrate in the time range up to 100 ns. In turn, the usage of the GINSES technique has some peculiarity and, due to the novelty of the method and complexity of the scattering geometry, difficulties in further data analysis appear. In the current work we present how simulations within the Distorted Wave Born Approximation (DWBA) with the BornAgain software can be used for GINSES data treatment and for the preparation to the GINSES experiment. Simultaneously we report on the possible challenges and reefs appearing in choosing the best model and the "wrong" understanding of the roughness parameter. With two showcase examples (a PNIPAM-brush and a PEG-microgel adsorbed on Si-surface), the simulation process as well as the application of the simulations to the GINSES data analysis are presented.