Regensburg 2022 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 14: Emerging Topics in Chemical and Polymer Physics, New Instruments and Methods
CPP 14.1: Vortrag
Dienstag, 6. September 2022, 09:30–09:45, H39
Where is the Water? — •Maximilian Fuchs1,2, Eduardo Machado Charry1,2, Gregor Böhm1,2, Roland Resel1, and Karin Zojer1,2 — 1Institute of Solid State Physics, NAWI Graz, Graz University of Technology, Austria — 2Christian Doppler Laboratory for Mass Transport through Paper, Graz University of Technology, Austria
The take up of liquid water by paper is a complex interplay between capillary transport and swelling of cellulose-lignin-based fibers. Though paper is a convenience product used every day, little is known how swelling affects the pore space between fibers and the subsequent transport within it. We used X-ray microcomputed tomography to monitor the spread of water in-situ. The sequence of 3D-images, segmented by a neural network, traces the time-dependent progression of swelling and liquid transport up to one hour after the application of water. We find that water not only swells the fiber walls, but also expands the pore space between the fibers. Even more remarkable is that there is no liquid water in the pores between the fibers of the examined paper. Rather, liquid water was found exclusively in the fiber lumen.