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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 24: Responsive and Adaptive Systems I
CPP 24.2: Talk
Wednesday, March 20, 2024, 10:00–10:15, H 0110
Soft matter thin films under pressure: a morphological investigation under Grazing Incidence Scattering — •Apostolos Vagias1,2, Theodore Manouras3,4, Andreas Buchner1, Philipp Gutfreund2, Lionel Porcar2, Andrew Nelson5, Leonardo Chiappisi2, David P. Kosbahn6, Marcell Wolf1, Laura Guasco7,8, Maria Vamvakaki3,4, and Peter Müller-Buschbaum1,6 — 1MLZ, TUM, 85748 Garching, Germany — 2Institut Laue Langevin (ILL), 38000 Grenoble, France — 3Institute of Electronic Structure and Laser, Foundation for Research and Technology Hellas, 700 13 Heraklion, Greece — 4Department of Materials Science and Technology, University of Crete, 700 13 Heraklion, Greece — 5ANSTO, Lucas Heights, NSW 2234, Australia — 6TUM School of Natural Sciences, Chair for Functional Materials, 85748 Garching, Germany — 7Max-Planck-Institut für Festkörperforschung, D-70569 Stuttgart, Germany — 8Max Planck Society Outstation at the MLZ, D-85748 Garching, Germany
Using a custom-designed pressure cell, we tune hydrostatic pressure and combine Grazing Incidence Small Angle Neutron Scattering (GISANS) with specular and off-specular reflectivity under pressure (P) to probe morphologies of soft matter layers immersed in heavy water at P = 1 bar and P = 800 bar. Our results reveal nanostructural rearrangements upon P-increase for a mixture of strongly segregated (hydrophilic) PDMAEMA and (hydrophobic) POFPMA homopolymer brushes anchored on Si substrate.
Keywords: Grazing Incidence Small Angle Neutron Scattering; high pressure; soft matter; polymer brushes; nanostructure