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BP: Fachverband Biologische Physik
BP 3: Biopolymers, Biomaterials and Bioinspired Functional Materials (joint session CPP/BP)
BP 3.5: Vortrag
Montag, 16. März 2020, 10:30–10:45, ZEU 114
Self-assembly of aligned cellulose nanofibrils during gel drying — •Ariane Suzzoni1, Calvin Jay Brett1,2,3, Susumu Yada1, Korneliya Gordeyeva1, Stephan Volkher Roth1,2, and Daniel Söderberg1,3 — 1KTH Royal Institute of Technology, SE-11428 Stockholm, Sweden — 2Deutsches Elektronen-Synchrotron (DESY), D-22607 Hamburg, Germany — 3Wallenberg Wood Science Centre, SE- 11428 Stockholm, Sweden
Cellulose nano fibrils (CNF) are largely studied in order to replace synthetic materials with natural ones. These materials based on natural fibers are an alternative to materials made from fossil energies, a big challenge in today's world. High mechanical performance can be related to the nanostructure of fibrils which composed the filaments. However, the mechanism involved is still unknown. A possible hypothesis is the mesoscale structure self-assembling occurs during consolidation and drying phase. Small Angle X-Ray scattering (SAXS) is a powerful technique to investigate the system arrangement at nanoscale. A flow-focusing system has been developed in a previous project to assemble CNF fibers with a highly ordered arrangement. The suspension formed using this microfluidic device is a gel containing a low concentration of CNF. SAXS experiments have been carried out directly on the gel filament lifted up in the air. The nanostructural changes were observed by SAXS during gel drying. We will present results obtained about the structure of cellulose nanofibrils as a function of drying time. This knowledge about CNF nanostructure formation will be a key to develop new eco-friendly materials.