Regensburg 2022 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 33: Focus Session: Soft Matter and Nanocomposites: New Opportunities with Advanced Neutron Sources 1

CPP 33.3: Talk

Thursday, September 8, 2022, 10:15–10:30, H38

Structure and Dynamics of Polymer Brushes and Microgels at Interfaces measured with Neutron Scattering — •Olaf Holderer¹ and Stefan Wellert² — ¹Jülich Centre for Neutron Science at MLZ, Forschungszentrum Jülich GmbH, 85748 Garching, Germany — ²Department of Chemistry, Technische Universität Berlin, 10623 Berlin, Germany

It is an experimental challenge to access structural and dynamic properties of brushes and microgels at the solid liquid interface [1]. Neutron scattering techniques such as Grazing Incidence Small Angle Neutron Scattering (GISANS) for structural investigations and Grazing Incidence Neutron Spin Echo Spectroscopy (GINSES) provide a means of studying structural and dynamic properties on molecular length scales at the interface. Simulations of the experimental conditions in the framework of the Distorted Wave Born Approximation help interpreting the static and dynamic scattering signals [2]. Examples of thermoresponsive microgels with different architecture and brushes at the interface are presented to illustrate the possibilities and challenges of this type of interface studies.

[1] J. Witte, T. Kyrey, J. Lurtzki, A.M. Dahl, M. Kühnhammer, R. von Klitzing, O. Holderer, S. Wellert, ACS Appl. Polym. Mater. 2021, 3, 2, 976-985

[2] T. Kyrey, M. Ganeva, J. Witte, R. von Klitzing, S. Wellert, O. Holderer, J. Appl. Cryst. (2021) 54, 72-79