Berlin 2018 – wissenschaftliches Programm
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BP: Fachverband Biologische Physik
BP 24: Bioinspired Functional Materials, Biomaterials and Biopolymers (joint session CPP/BP)
BP 24.5: Vortrag
Mittwoch, 14. März 2018, 16:00–16:15, PC 203
Atomic force microscopy (AFM) based method to investigate the transversal viscoelastic properties of paper fibers — •Caterina Czibula1,3, Christian Ganser1,3, Ulrich Hirn2,3, and Christian Teichert1,3 — 1Institute of Physics, Montanuniversitaet Leoben, Austria — 2Institute for Paper, Pulp and Fiber Technology, Graz University of Technology, Austria — 3Christian Doppler Laboratory for Fiber Swelling and Paper Performance, Austria
It is well known that paper fibers are an inhomogeneous and hierarchical material. Resulting structure-property relations on the fiber scale as well as on the paper scale are complicated and not yet fully understood. To gain more insight on how mechanical properties of fibers are related to properties of the paper, our work focusses on the transverse viscoelastic behavior of single pulp fibers. To reach this ambitious goal we implemented an AFM based method.
Probing nanoscale mechanical properties of soft materials with AFM yields information on the performance of the material. Furthermore, precise force control in AFM methods is possible, and with different contact models, the contact between AFM tip and sample surface can be well described. Here, we use the Johnson-Kendall-Roberts model because it includes adhesion. At the continumm scale, simple empiric models combining springs and dash pots are often used to represent the bulk behavior of viscoelastic materials. Here, some of those models are explained and are used to describe local viscoelastic properties on the nanoscale. Results are presented for kraft pulp and compared to those of viscose fibers which are a simpler model system.