Nanomechanical characterisation of a water-repelling terpolymer coating of cellulosic fibres

Auernhammer, Julia; Bell, Alena K.; Schulze, Marcus; Du, Yun; Stühn, Lukas; Wendenburg, Sonja; Pause, Isabelle; Biesalski, Markus; Ensinger, Wolfgang; Stark, Robert W.

doi:10.1007/s10570-020-03675-9

Cited by 6 publications

(4 citation statements)

References 46 publications

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“…The Derjaguin-Muller-Toporov (DMT) model implemented in the Nanosope Analysis (V2.0) software was used to obtain the modulus and adhesion force mapping during the PFQNM measurements, where the localized Young´s module (denoted as modulus or DMT modulus in the following texts) and adhesive force at any interesting location of a PFQNM image were calculated. The DMT model includes adhesion outside the contact area and is suitable for high elastic moduli, low adhesion and a small radius of indentation and was proven to be suitable for nanocellulose studies [ 19 , 38 ]. In our case, it is a safe approximation because indentations are small, adhesion is weak in aqueous environments, and there is an acceptable difference of ca.…”

Section: Methodsmentioning

confidence: 99%

Effect of decoration route on the nanomechanical, adhesive, and force response of nanocelluloses—An in situ force spectroscopy study

Mathew

2023

PLoS ONE

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Although cellulose derivatives are widely applied in high-tech materials, the relation between their force responses and their surface chemical properties in a biological environment as a function of pH is unknown. Here, interaction forces of surface modified cellulose nanocrystals (CNCs), lignin residual cellulose nanocrystals (LCNCs), and 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO)-oxidized cellulose nanofibres (TCNFs) with OSO3−, COO− and lignin chemical groups were measured using in situ peak force quantitative nanomechanical mapping and force spectroscopy in salt solution at two pH values. We found that the forces acting between the tip and CNC or LCNC are steric dominated showing long range and slow decay as a result of their low surface charge density. High Mw lignin contributed to the increased repulsion range for LCNCs compared to CNCs. The repulsion measured for TCNFs at the very short range was electrostatic force dominating showing a steep decay attributed to its high surface charge density. In the case of TCNFs, electrostatic double layer force was also evidenced by the attraction measured at secondary minima. In all the three cases the electro steric interactions are pH dependent. Dissipation maps verified that the force behavior for each material was related to structural conformation restriction of the groups at compression. The slow decayed repulsion of CNCs or LCNCs is related to a weak restriction of conformational change due to small surface groups or high molecular weight bound polymers forming flat layers, whereas the steep repulsion of TCNFs is attributed to a strong conformation restriction of carboxylic groups occurred by forming extended structure. Our results suggest that the force responses of the materials were dominated by surface charges and structural differences. TCNFs showed superior nanomechanical and repulsion properties over CNCs or LCNCs at neutral pH.

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Section: Methodsmentioning

confidence: 99%

Effect of decoration route on the nanomechanical, adhesive, and force response of nanocelluloses—An in situ force spectroscopy study

Mathew

2023

PLoS ONE

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“…fiber coating, improving hydrophobicity and wet strength. [AUERNHAMMER et al, 2021] A further challenge concerning paper material's mechanical properties for construction occurs regarding its time dependent behavior. Investigations on the creep behavior show that additional deformations as well as retarded failure of paper is to be expected when put under structural loads.…”

Section: General Propertiesmentioning

confidence: 99%

On the Bi-Axial In-Plane Behavior of Laminated Paperboard Components in Construction: A Representative Engineering Model

Kiziltoprak

2023

Mechanik, Werkstoffe Und Konstruktion Im Bauwesen

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The present thesis was written as part of my work as a scientific assistant at the Institute of Structural Mechanics and Design at Technische Universität Darmstadt between 2017 and 2022. The intention of subsequent lines is to thank those who have supported me and encouraged me on my long journey.My greatest thanks go to Professor JENS SCHNEIDER for the trust placed in me and for giving me the opportunity to begin and complete my dissertation at Technische Universität Darmstadt in an rather interesting field of research on innovative materials for structural engineering. His dedication to the institute, motivation of staff and openness to new research ideas is unique and enabled me to work freely and creatively. I am especially grateful to him for taking time to mentor me and my colleagues even though he was very busy with the tasks and activities of the vice presidency at Technische Universität Darmstadt. These thanks also go to Professor ULRICH KNAACK, whose declared goal is to train young scientists on their hopefully long path in science in such a way that they are better than their teachers and form the next generation of professors and scientist of highest levels, for his persistent support, motivation and openness for discussions. I am also very grateful to Professor STEFAN KOLLING for his scientific discussions, which encouraged to look at problems from different perspectives.I would also like to thank my colleagues at the Institute of Structural Mechanics and Design for the many interesting discussions and the friendly interaction to a very pleasant working atmosphere. Special thanks go to my colleagues MICHAEL DRASS, EV-GENIA KANLI, MARCEL HÖRBERT, MUHARREM AKTAS, REBECCA BACH and SILKE WALLNER. Furthermore, I would like to thank MARCUS PFEIFFER, ROBERT GÖTZINGER, JULIAN MUSHÖVEL, NICOLA JESSEN, MARCO VOLKMANN and FABIAN LUTTROPP from other institutes who also contributed to the BAMP! project in neighboring research fields. In addition, I would like to thank the students of Technische Universität Darmstadt who supported me through their enthusiasm for research and interest in complex issuesin the form that they wrote their theses with me. This research acknowledges financial support within the LOEWE program of excellence of the Federal State of Hessen (project initiative BAMP!).I would also like to thank Herbster Hülsen in particular Mr. MICHAEL JENISCH and Mr. NICOLAI WIECZOREK, Grünig Adhesives, Paul & Co, Stora Enso who have always supported my projects and my research.The preparation of a dissertation requires family support. Therefore, I would like to especially thank my parents, MEVLÜDE and HACI KIZILTOPRAK, who are always at my side and have supported me in every situation.My sincere personal thanks go to my beloved wife CANAN for bringing happiness, wisdom and tenderness into my life. Her blind trust and her support in all kind of situations -in good and hard times -made it possible to write my dissertation.

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“…However, (Mantanis et al 1995) recorded the swelling of cellulose single fibres in water and showed that equilibrium was reached at 45 minutes. We performed the measurements in the wet state according to (Auernhammer et al 2021). Additionally, the water drop for swelling was removed before the measurement, preventing the fibre from swelling further.…”

Section: Fibresmentioning

confidence: 99%

Nanomechanical Subsurface Characterisation of Cellulosic Fibres

Auernhammer¹,

Langhans²,

Schäfer³

et al. 2021

Preprint

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The mechanical properties of single fibres are highly important in the paper production process to produce and adjust properties for the favoured fields of application. The description of mechanical properties is usually characterised via linearized assumptions and is not resolved locally or spatially in three dimensions. In tensile tests or nanoindentation experiments on cellulosic fibres, only one mechanical parameter, such as elastic modulus or hardness, is usually obtained. To obtain a more detailed mechanical picture of the fibre, it is crucial to determine mechanical properties in depth. To this end, we discuss an atomic force microscopy-based approach to examine the local stiffness as a function of indentation depth via static force-distance curves. This method has been applied to linter fibres (extracted from a finished paper sheet) as well as to natural raw cotton fibres to better understand the influence of the pulp treatment process in paper production on the mechanical properties. Both types of fibres were characterised in dry and wet conditions with respect to alterations in their mechanical properties. Subsurface imaging revealed which wall in the fibre structure protects the fibre against mechanical loading. Via a combined 3D display, a spatially resolved mechanical map of the fibre interior near the surface can be established. Additionally, we labelled fibres with carbohydrate binding modules tagged with fluorescent proteins to compare the AFM results with fluorescence confocal laser scanning microscopy imaging. Nanomechanical subsurface imaging is thus a tool to better understand the mechanical behaviour of cellulosic fibres, which have a complex, hierarchical structure.

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Nanomechanical characterisation of a water-repelling terpolymer coating of cellulosic fibres

Cited by 6 publications

References 46 publications

Effect of decoration route on the nanomechanical, adhesive, and force response of nanocelluloses—An in situ force spectroscopy study

Effect of decoration route on the nanomechanical, adhesive, and force response of nanocelluloses—An in situ force spectroscopy study

On the Bi-Axial In-Plane Behavior of Laminated Paperboard Components in Construction: A Representative Engineering Model

Nanomechanical Subsurface Characterisation of Cellulosic Fibres

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