Paper Technology International 2020 - Journal - Page 85

PAPERTECHNOLOGYINTERNATIONAL
CONCLUSION
The atomic force microscopy is a powerful tool to characterise the mechanical properties of single paper fibres. The AFM also
allows for the investigation of paper fibres in different environmental conditions, e.g. humid air or water.
It was shown that by the help of force-bending curves obtained with a colloidal probe AFM, it was possible to create a detailed
mechanical picture of the paper fibre. Mechanical properties such as adhesion and dissipation, bending ability, contact stress, and
strain could be identified. In general, the bending ability increased as RH increased.
The nanomechanical mapping also allowed for further insights into the local mechanics of coated and uncoated fibres. For
uncoated fibres, crystalline and amorphous regions could be identified in the topography images, especially in the mechanical
property maps. When increasing the RH, the topography images exhibited swollen microfibrils, and the microfibrils changed in
size and shape. The swelling and therefore the softening of the fibre apparently started in the non-ordered regions. If the fibres
were coated with the hydrophobic polymer, no swelling of the microfibrils could be found in the topography images, and no
significant changes in the mechanical properties occurred.
Acknowledgement:
The authors would like to thank the Deutsche Forschungsgemeinschaft under grant PAK 962 project numbers 405549611,
405422877, 405422473 and 52300548 for financial support.
Special thanks to:
Alena K. Bell, Marcus Schulze, Yue Du, Lukas Stühn, Sonja Wendenburg, Isabelle Pause, Markus Biesalski, Wolfgang Ensinger,
Anna Lisa Eichhorn, Lars-Oliver Heim, Tom Keil, Binbin Lin, Jan-Lukas Schäfer, and Bai-Xiang Xu
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