Comparison of silicon and OH-modified AFM tips for adhesion force analysis on functionalised surfaces and natural polymers

Colson, Jérôme; Andorfer, Laurin; Nypelö, Tiina; Lütkemeier, Bernd; Stöckel, Frank; Konnerth, Johannes

doi:10.1016/j.colsurfa.2017.06.017

Cited by 11 publications

(3 citation statements)

References 32 publications

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“…Adhesion phenomena have been investigated in wood scaffolds and found to be influenced by the wood roughness. , Comparisons of absolute values found in literature remained unreliable because of the differences in measurement modes and settings used as well as variations in the chemical functionalities of AFM tips. Because native wood materials are hygroscopic and the wood surface readily binds water, our measurements, performed in ambient air, might be highly influenced by capillary forces between the AFM tip and the wood surface .…”

Section: Resultsmentioning

confidence: 99%

Nanoscale Chemical Features of the Natural Fibrous Material Wood

Gusenbauer

Jakob

et al. 2020

Biomacromolecules

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Peak force infrared (PFIR) microscopy is a recently developed approach to acquire multiple chemical and physical material properties simultaneously and with nanometer resolution: topographical features, infrared (IR)-sensitive maps, adhesion, stiffness, and locally resolved IR spectra. This multifunctional mapping is enabled by the ability of an atomic force microscope tip in the peak force tapping mode to detect photothermal expansion of the sample. We report the use of the PFIR to characterize the chemical modification of bio-based native and intact wooden matrices, which has evolved into an increasingly active research field. The distribution of functional groups of wood cellulose aggregates, either in native or carboxylated states, was detected with a remarkable spatial resolution of 16 nm. Furthermore, mechanical and chemical maps of the distinct cell wall layers were obtained on polymerized wooden matrices to localize the exact position of the modified regions. These findings shall support the development and understanding of functionalized wood materials.

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Section: Resultsmentioning

confidence: 99%

Nanoscale Chemical Features of the Natural Fibrous Material Wood

Gusenbauer

Jakob

et al. 2020

Biomacromolecules

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“…We explored the adhesion force of the fiber cross sections to a standard silicon AFM tip in ambient environment similar to the approach recently shown by Colson et al ( 2017 ). While the contact angle measurements performed by dipping fibers into the polar and apolar liquids are to probe the fiber outer surface, the adhesion force mapping were performed on the internal part of the fiber, the cross section.…”

Section: Resultsmentioning

confidence: 99%

Conversion of wood-biopolymers into macrofibers with tunable surface energy via dry-jet wet-spinning

et al. 2018

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Surface chemistry of regenerated all-wood-biopolymer fibers that are fine-tuned by composition of cellulose, lignin and xylan is elucidated via revealing their surface energy and adhesion. Xylan additive resulted in thin fibers and decreased surface energy of the fiber outer surfaces compared to the cellulose fibers, or when lignin was used as an additive. Lignin increased the water contact angle on the fiber surface and decreased adhesion force between the fiber cross section and a hydrophilic probe, confirming that lignin reduced fiber surface affinity to water. Lignin and xylan enabled fiber decoration with charged groups that could tune the adhesion force between the fiber and an AFM probe. The fibers swelled in water: the neat cellulose fiber cross section area increased 9.2%, the fibers with lignin as the main additive 9.1%, with xylan 6.8%, and the 3-component fibers 5.5%. This indicates that dimensional stability in elevated humidity is improved in the case of 3-component fiber compared to 2-component fibers. Xylan or lignin as an additive neither improved strength nor elongation at break. However, improved deformability was achieved when all the three components were incorporated into the fibers.Graphical Abstract Electronic supplementary materialThe online version of this article (10.1007/s10570-018-1902-4) contains supplementary material, which is available to authorized users.

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“…AFM adhesion data, which shows higher values for APW compared to CON samples (Fig. 3D), has been previously used to assess hydrophilicity states of several substrates with both silicon and silicon nitride tips: 25,27,28 sample hydrophilicity is expected to be associated with evident AFM pull-off adhesion values due to the formation of a water meniscus between the cantilever tip and the sample surface, 29 as schematically shown in Fig. S3A.…”

Section: Nanoscale Communicationmentioning

confidence: 99%

Organic matter identifies the nano-mechanical properties of native soil aggregates

et al. 2018

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Localized variations at the nanoscale in soil aggregates and in the spatial organisation of soil organic matter (SOM) are critical to understanding the factors involved in soil composition and turnover. However soil nanoscience has been hampered by the lack of suitable methods to determine soil biophysical properties at nanometre spatial resolution with minimal sample preparation. Here we introduce for the first time an Atomic Force Microscopy (AFM)-based Quantitative Nano-Mechanical mapping (QNM) approach that allows the characterisation of the role of SOM in controlling surface nano-mechanical properties of soil aggregates. SOM coverage resulted in an increased roughness and surface variability of soil, as well as in decreased stiffness and adhesive properties. The latter also correlates with nano- to macro-wettability features as determined by contact angle measurements and Water Drop Penetration Time (WDPT) testing. AFM thus represents an ideal quantitative tool to complement existing techniques within the emerging field of soil nanoscience.

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Comparison of silicon and OH-modified AFM tips for adhesion force analysis on functionalised surfaces and natural polymers

Cited by 11 publications

References 32 publications

Nanoscale Chemical Features of the Natural Fibrous Material Wood

Nanoscale Chemical Features of the Natural Fibrous Material Wood

Conversion of wood-biopolymers into macrofibers with tunable surface energy via dry-jet wet-spinning

Organic matter identifies the nano-mechanical properties of native soil aggregates

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