Surface Properties of Elastomeric Polypropylenes Studied with Atomic Force Microscopy

Dietz, Christian; Zerson, Mario; Riesch, Christian; Franke, Mechthild; Magerle, R.

doi:10.1021/ma801236p

Cited by 27 publications

(35 citation statements)

References 44 publications

(102 reference statements)

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“…We attribute the shape of the PB curves to viscoelastic dissipation processes 19 and note the plateau-like shape of the PS curves, similar to those curves observed on crystalline regions of polypropylene. 24 Figure 1 panels f and g show the analysis of the APD curves according to ref 21. Conservative and dissipative contributions to the total tipϪsample interaction force are expressed by an additional tipϪsample spring constant k TS and the effective damping parameter ␣ eff /m.…”

Section: Resultsmentioning

confidence: 99%

Subsurface Imaging of Soft Polymeric Materials with Nanoscale Resolution

2010

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Nondestructive depth-resolved imaging of ∼20-nm-thick surface layers of soft polymeric materials is demonstrated using amplitude modulation atomic force microscopy (AM-AFM). From a map of amplitude-phase-distance curves, the tip indentation into the specimen is determined. This serves as a depth coordinate for reconstructing cross sections and volume images of the specimen's mechanical properties. Our method reveals subsurface structures which are not discernible using conventional AM-AFM. Results for surfaces of a block copolymer and a semicrystalline polymer are presented.

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Section: Resultsmentioning

confidence: 99%

Subsurface Imaging of Soft Polymeric Materials with Nanoscale Resolution

2010

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“…[46][47][48] Furthermore, the APD curves yield the z-axis position of the unperturbed surface as well as the tip indentation. 22,44,[49][50][51] On hydrated collagen fibrils, the tip indentation reaches up to 3.5 nm. 22 Spitzner et al 45 demonstrated how height and phase images can be reconstructed for multiple set points from one data set of APD curves measured within a specified surface area.…”

Section: Introductionmentioning

confidence: 99%

Unraveling capillary interaction and viscoelastic response in atomic force microscopy of hydrated collagen fibrils

Uhlig

Magerle

2017

Nanoscale

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The mechanical properties of collagen fibrils depend on the amount and the distribution of water molecules within the fibrils. Here, we use atomic force microscopy (AFM) to study the effect of hydration on the viscoelastic properties of reconstituted type I collagen fibrils in air with controlled relative humidity. With the same AFM tip, we investigate the same area of a collagen fibril with two different force spectroscopy methods: force-distance (FD) and amplitude-phase-distance (APD) measurements. This allows us to separate the contributions of the fibril's viscoelastic response and the capillary force to the tip-sample interaction. A water bridge forms between the tip apex and the surface, causing an attractive capillary force, which is the main contribution to the energy dissipated from the tip to the specimen in dynamic AFM. The force hysteresis in the FD measurements and the tip indentation of only 2 nm in the APD measurements show that the hydrated collagen fibril is a viscoelastic solid. The mechanical properties of the gap regions and the overlap regions in the fibril's D-band pattern differ only in the top 2 nm but not in the fibril's bulk. We attribute this to the reduced number of intermolecular crosslinks in the reconstituted collagen fibril. The presented methodology allows the mechanical surface properties of hydrated collagenous tissues and biomaterials to be studied with unprecedented detail on the nanometer scale.

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“…However, the next-neighbor distance between two adjacent surface amino groups must be below the AFM tip diameter (≈30 nm) as no distinct height steps or islands could be observed in the AFM images. A resolution of the density of bound molecules may be possible by using novel techniques such as the measurement of AFM amplitude–phase–distance curves [40]. From such experiments, the dissipated energy of the AFM tip oscillation can be calculated, which depends on the local elastic and therefore structural surface properties of the substrate.…”

Section: Resultsmentioning

confidence: 99%

Selective surface modification of lithographic silicon oxide nanostructures by organofunctional silanes

Baumgärtel¹,

Borczyskowski²,

Graaf³

2013

Beilstein J. Nanotechnol.

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SummaryThis study investigates the controlled chemical functionalization of silicon oxide nanostructures prepared by AFM-anodization lithography of alkyl-terminated silicon. Different conditions for the growth of covalently bound mono-, multi- or submonolayers of distinctively functional silane molecules on nanostructures have been identified by AFM-height investigations. Routes for the preparation of methyl- or amino-terminated structures or silicon surfaces are presented and discussed. The formation of silane monolayers on nanoscopic silicon oxide nanostructures was found to be much more sensitive towards ambient humidity than, e.g., the silanization of larger OH-terminated silica surfaces. Amino-functionalized nanostructures have been successfully modified by the covalent binding of functional fluorescein dye molecules. Upon excitation, the dye-functionalized structures show only weak fluorescence, which may be an indication of a relatively low surface coverage of the dye molecules on length scale that is not accessible by standard AFM measurements.

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Surface Properties of Elastomeric Polypropylenes Studied with Atomic Force Microscopy

Cited by 27 publications

References 44 publications

Subsurface Imaging of Soft Polymeric Materials with Nanoscale Resolution

Subsurface Imaging of Soft Polymeric Materials with Nanoscale Resolution

Unraveling capillary interaction and viscoelastic response in atomic force microscopy of hydrated collagen fibrils

Selective surface modification of lithographic silicon oxide nanostructures by organofunctional silanes

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