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Understanding near‐surface polymer dynamics by a combination of grazing‐incidence neutron scattering and virtual experiments
Author(s) -
Kyrey Tetyana,
Ganeva Marina,
Witte Judith,
von Klitzing Regine,
Wellert Stefan,
Holderer Olaf
Publication year - 2021
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s1600576720014739
Subject(s) - neutron scattering , scattering , grazing incidence small angle scattering , neutron spin echo , materials science , neutron , polymer , small angle neutron scattering , optics , biological small angle scattering , chemical physics , physics , nuclear physics , composite material
Neutron spin‐echo spectroscopy is a unique experimental method for the investigation of polymer dynamics. The combination of neutron spin‐echo spectroscopy with grazing‐incidence geometry (GINSES) opens the possibility to probe the dynamics of soft‐matter materials in the vicinity of the solid substrate in the time range up to 100 ns. However, the usage of the GINSES technique has some peculiarities and, due to the novelty of the method and complexity of the scattering geometry, difficulties in further data analysis occur. The current work discusses how virtual experiments within the distorted‐wave Born approximation using the BornAgain software can improve GINSES data treatment and aid the understanding of polymer dynamics in the vicinity of the solid surface. With two examples, poly( N ‐isopropyl acrylamide) brushes and poly(ethylene glycol) microgels on Si surfaces, the simulation as well as the application of the simulation to the GINSES data analysis are presented. The approach allowed a deeper insight to be gained of the background effect and scattering contribution of different layers.

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