Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

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. Roth^1,2, Calvin J. Brett^1,2, Alexandros Alexakis², Lucas P. Kreuzer³, Martin Mansson², Sarah Rogers⁴, Eva Malmström², Peter Müller-Buschbaum^3,5, 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.