SKM 2023 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 41: Biopolymers, Biomaterials and Bioinspired Functional Materials II (joint session CPP/BP)
CPP 41.2: Vortrag
Mittwoch, 29. März 2023, 16:45–17:00, MER 02
Structural changes in cellulose nanofibril-colloid hybrid films during humidity cycling — •Stephan V. Roth1,2, Calvin J. Brett1,2, Alexandros Alexakis2, Lucas P. Kreuzer3, Martin Mansson2, Sarah Rogers4, Eva Malmström2, Peter Müller-Buschbaum3,5, and L. Daniel Söderberg2 — 1Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany — 2KTH Royal Institute of Technology, Stockholm, Sweden — 3TUM School of Natural Sciences, Chair for Functional Materials, Garching — 4ISIS-STFC, Rutherford Appleton Laboratory, Chilton, Oxon OX11 0QX, UK — 5MLZ, TUM, Garching, Germany
Biocompatible cellulose nanofibrils (CNFs) are an ideal material for sustainable biomaterial templates. Combined with latex colloids, the resulting hybrid colloid-CNF functional materials are excellent candidates for bio-inspired structural colors. Due to the hydrophilic nature of CNFs, we investigate the stability against humidity cycling in terms of reversible/irreversible structural rearrangements. We applied depth sensitive grazing incidence small-angle neutron scattering to evaluate the humidity-induced rearrangements in hybrid latex colloid:CNF templates in situ during cyclic humidification. After the first humidity cycle, a change in morphology on the scale of several 10 nm was observed, which is attributed to latex particles which diffused in the network and enlarged the pores of the network. The measured kinetics resolve the time- and depth-dependence of the differently sized colloids' penetration into the porous CNF network.