Wetting on Heterogeneous Surfaces

Senez, V.; Thomy, V.; Dufour, Renaud

doi:10.1002/9781119015093.ch2

Cited by 2 publications

(1 citation statement)

References 27 publications

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“…No changes in contact angle were observed as temperature was increased for micelle modified surfaces. We are aware that the wetting of rough, heterogeneous surfaces is a complex function of chemical interactions between surface and fluid components as well as topographical parameters (e.g., roughness, surface coverage) − and so unambiguous interpretation of the observed wettability for all samples is difficult here. Nonetheless, our contact angle measurements demonstrate that the conformation of ELP block copolymers upon adsorption (i.e., unimers vs micelles) can substantially affect the thermally responsive properties of the adsorbed polypeptide layers.…”

Section: Resultsmentioning

confidence: 99%

Functional Modification of Silica through Enhanced Adsorption of Elastin-Like Polypeptide Block Copolymers

et al. 2017

Biomacromolecules

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A powerful tool for controlling interfacial properties and molecular architecture relies on the tailored adsorption of stimuli-responsive block copolymers onto surfaces. Here, we use computational and experimental approaches to investigate the adsorption behavior of thermally responsive polypeptide block copolymers (elastin-like polypeptides, ELPs) onto silica surfaces, and to explore the effects of surface affinity and micellization on the adsorption kinetics and the resultant polypeptide layers. We demonstrate that genetic incorporation of a silica-binding peptide (silaffin R5) results in enhanced adsorption of these block copolymers onto silica surfaces as measured by quartz crystal microbalance and ellipsometry. We find that the silaffin peptide can also direct micelle adsorption, leading to close-packed micellar arrangements that are distinct from the sparse, patchy arrangements observed for ELP micelles lacking a silaffin tag, as evidenced by atomic force microscopy measurements. These experimental findings are consistent with results of dissipative particle dynamics simulations. Wettability measurements suggest that surface immobilization hampers the temperature-dependent conformational change of ELP micelles, while adsorbed ELP unimers (i.e., unmicellized block copolymers) retain their thermally responsive property at interfaces. These observations provide guidance on the use of ELP block copolymers as building blocks for fabricating smart surfaces and interfaces with programmable architecture and functionality.

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Section: Resultsmentioning

confidence: 99%