Dresden 2020 – scientific programme

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BP: Fachverband Biologische Physik

BP 3: Biopolymers, Biomaterials and Bioinspired Functional Materials (joint session CPP/BP)

BP 3.5: Talk

Monday, March 16, 2020, 10:30–10:45, ZEU 114

Self-assembly of aligned cellulose nanofibrils during gel drying — •Ariane Suzzoni¹, Calvin Jay Brett^1,2,3, Susumu Yada¹, Korneliya Gordeyeva¹, Stephan Volkher Roth^1,2, and Daniel Söderberg^1,3 — 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.