Nanomechanical Properties of Mechanical Double-Layers:  A Novel Semiempirical Analysis

Cappella, Brunero; Silbernagl, Dorothee

doi:10.1021/la701234q

Cited by 30 publications

(22 citation statements)

References 20 publications

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“…The elastic moduli of PnBMA and PS measured in this experiment are larger than 1 GPa and 3 GPa, i.e., the values previously found by Cappella et al for bulk polymers [17,18,20], but are in agreement with the measured values of thin films of PnBMA [19,37,38]. Such larger Young's moduli are comprehensible, when the sample preparation and the constraints of the polymers are accounted for.…”

Section: Resultssupporting

confidence: 91%

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Mechanical Properties and Adhesion of a Micro Structured Polymer Blend

Cappella

2011

Polymers

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Abstract:A 50:50 blend of polystyrene (PS) and poly(n-butyl methacrylate) (PnBMA) has been characterized with an Atomic Force Microscope (AFM) in Tapping Mode and with force-distance curves. The polymer solution has been spin-coated on a glass slide. PnBMA builds a uniform film on the glass substrate with a thickness of ≅200 nm. On top of it, the PS builds an approximately 100 nm thick film. The PS-film undergoes dewetting, leading to the formation of holes surrounded by about 2 µm large rims. In those regions of the sample, where the distance between the holes is larger than about 4 µm, light depressions in the PS film can be observed. Topography, dissipated energy, adhesion, stiffness and elastic modulus have been measured on these three regions (PnBMA, PS in the rims and PS in the depressions). The two polymers can be distinguished in all images, since PnBMA has a higher adhesion and a smaller stiffness than PS, and hence a higher dissipated energy. Moreover, the polystyrene in the depressions shows a very high adhesion (approximately as high as PnBMA) and its stiffness is intermediate between that of PnBMA and that of PS in the rims. This is attributed to higher mobility of the PS chains in the depressions, which are precursors of new holes.

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Section: Resultssupporting

confidence: 91%

“…The mechanical behavior of PnBMA, both in bulk [17,18] and as thin or ultrathin films [19], and of PS [18,20] is well known and was examined in detail by means of force-displacement curves in our previous experiments.…”

Section: Methodsmentioning

confidence: 99%

Mechanical Properties and Adhesion of a Micro Structured Polymer Blend

Cappella

2011

Polymers

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“…The size and geometry of the droplets allows us to verify the critical film height that induces the so-called "mechanical double-layer effect" 16 or, in other words, the minimum thickness of polymer that we can probe by PeakForce™ for a given indentation, without measuring the influence of the stiff substrate underneath. For a semispherical PS droplet, the reduced modulus image [ Fig.…”

Section: Formation Of Different Phases Of Polystyrene and Poly(methylmentioning

confidence: 99%

Nanomechanical properties of solvent cast polystyrene and poly(methyl methacrylate) polymer blends and self-assembled block copolymers

Lorenzoni

Evangelio

Nicolet

et al. 2015

J. Micro/Nanolith. MEMS MOEMS

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Abstract. The nanomechanical properties of solvent-cast polymer thin films have been investigated using PeakForce™ Quantitative Nanomechanical Mapping. The samples consisted of films of polystyrene (PS) and poly(methyl methacrylate) (PMMA) obtained after the dewetting of toluene solution on a polymeric brush layer. Additionally, we have probed the mechanical properties of poly(styrene-b-methyl methacrylate) block copolymers (BCP) as randomly oriented thin films. The probed films have a critical thickness <50 nm and present features to be resolved <42 nm. The Young's modulus values obtained through several nanoindentation experiments present a good agreement with previous literature, suggesting that the PeakForce™ technique could be crucial for BCP investigations, e.g., as a predictor of the mechanical stability of the different phases.

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“…31 In our system the sessile drop 'indents' the soft surface exerting a downwards-oriented force via its capillary pressure. The effect is very similar to the pressure exerted by a hard tip indenting a substrate.…”

mentioning

confidence: 99%

Solid-supported thin elastomer films deformed by microdrops

et al. 2009

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A sessile droplet can deform the surface of a soft solid not only with its weight. The surface tension pulls up a ridge at the perimeter of the drop, and the capillary pressure embosses a quasi-spherical dimple underneath the drop. This holds for the case of a bulk solid. However, if the solid forms a film with thickness comparable to the deformation scale the shape and the depth of the dimple are strongly distorted. We investigated dimples on elastomer films with a Young's modulus of 25 kPa and thickness in the range 4-104 mm embossed by sessile ionic liquid droplets. The films are supported by an undeformable glass slide. Below a certain critical film thickness, the dimple is shallower and the ridge at the drop rim is less elevated than for the bulk elastomer. The deviations are more pronounced for thinner films. Further, troughs form at the two sides of the ridge. Their distance from the rim is equivalent to the layer thickness. The measurements are qualitatively reproduced by an analytical model and quantitatively by numerical simulations. A consistent physical picture of the deformation on the bulk elastomer and of the distortions on the thin films is given.

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Nanomechanical Properties of Mechanical Double-Layers: A Novel Semiempirical Analysis

Cited by 30 publications

References 20 publications

Mechanical Properties and Adhesion of a Micro Structured Polymer Blend

Mechanical Properties and Adhesion of a Micro Structured Polymer Blend

Nanomechanical properties of solvent cast polystyrene and poly(methyl methacrylate) polymer blends and self-assembled block copolymers

Solid-supported thin elastomer films deformed by microdrops

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