Dresden 2011 – wissenschaftliches Programm

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BP: Fachverband Biologische Physik

BP 3: Biopolymers and Biomaterials I (with CPP)

BP 3.3: Vortrag

Montag, 14. März 2011, 11:15–11:30, ZEU 222

Mechanical properties of fiber-fiber bonds in paper studied by atomic force microscopy — •Franz Schmied^1,4, Wolfgang Fischer^2,4, Ulrich Hirn^2,4, Robert Schennach^3,4, and Christian Teichert^1,4 — ¹Institute of Physics, University of Leoben, 8700 Leoben, Austria — ²Institute for Paper, Pulp and Fiber Technology, Graz University of Technology, 8010 Graz, Austria — ³Institute of Solid State Physics, Graz University of Technology, 8010 Graz, Austria — ⁴CD-Laboratory for Surface Chemical and Physical Fundamentals of Paper Strength, Graz University of Technology, 8010 Graz, Austria

Paper has been used as a packaging material and for printing purposes for a long time, however a fundamental quantitative understanding for the mechanisms of paper strength has not yet been worked out. A sheet of paper is a network of individual single fibers extracted from wood. During the production cycle, these single fibers need to approach close enough to form bonds between each other. The resulting network is than called paper. Here, we present a comprehensive AFM investigation of single fibers as well as fiber-fiber bonds to achieve a deeper insight into the various mechanisms [1] that bind two single pulp fibers together. Beside morphological investigations, we present force versus distance curves to study the separation of two bonded fibers as distance and force controlled experiments. With these experiments it is possible to learn more about the mechanical properties of single fiber-fiber bonds. Supported by Mondi and the Christian Doppler Research Society, Vienna, Austria. [1] Lindström, T. et al., Proc. 13th Fundamental Research Symp, 2005.