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BP: Fachverband Biologische Physik
BP 26: Biopolymers, Biomaterials and Bioinspired Functional Materials (joint session CPP/BP)
BP 26.8: Vortrag
Donnerstag, 21. März 2024, 11:45–12:00, H 0111
Paper Fibers Beyond Saturation: µ-CT Analysis of Prolonged Structural Changes — •Maximilian Fuchs1,2, Raimund Teubler1,3, Daniel Kollreider1,2, Maximilian Grillitsch1,2, Ekaterina Baikova1,2, and Karin Zojer1,2 — 1Institute for Solid State Physics, Graz University of Technology, Austria — 2Christian Doppler Laboratory for Mass Transport through Paper — 3Institute of Analytical Chemistry and Food Chemistry, Graz University of Technology, Austria
The uptake of water or dimethylsulfoxid (DMSO) by a cellulose-lignin based fiber network, in this case paper, is a complex interplay between capillary transport and sorption of these polar volatiles into the fibers. Microcomputed tomography (µ-CT) allows us to correlate this uptake with changes in the microstructure, with water and DMSO being offered either as a liquid or additionally via the gas phase to prevent capillary uptake. A pore network analysis of the 3D images shows that uptake from liquid and gas cause similar initial structural changes, although the fiber space and pore space between the fibers swells to different extents. Interestingly, fibers and pores continue to expand long after mass uptake from gas phase has ceased. This long-lasting expansion is most likely caused by an increasing amount of detached fibril bundles in the fiber wall.
Keywords: µ-CT; swelling; structural changes; paper; PNM