Sharp‐Cornered Liquid Drops by Wetting of Nanoscale Features

Birembaut, Fabrice; Perney, N.M.B.; Pechstedt, Katrin; Bartlett, Philip N.; Russell, Andrea E.; Baumberg, Jeremy J.

doi:10.1002/smll.200800564

Cited by 5 publications

(8 citation statements)

References 9 publications

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“…This is consistent with the work of Zhu et al, who used a similar surface of “microbowl arrays” and also Birembaut et al. with square pyramidal pits …”

Section: Resultssupporting

confidence: 92%

“…The three-phase contact line can also be strongly pinned at the edge of the cavities when drops evaporate on such a surface, which causes large contact angle hysteresis . Birembaut et al demonstrated this effect on a substrate with square pyramidal pits arranged in a square lattice . As a drop evaporated on the surface, the three-phase contact line became strongly pinned on the edges of the square-sided pits, leading to a corrugated droplet edge.…”

Section: Resultsmentioning

confidence: 99%

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Wetting of Surfaces Made of Hydrophobic Cavities

2015

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Templated electrodeposition through a close packed, monolayer array of 3 μm polystyrene spheres followed by removal of the template by dissolution in an organic solvent was used to fabricate sphere segment void (SSV) surfaces in gold with heights up to 1.5 μm. These surfaces were made hydrophobic by treating with 1-dodecanethiol. Contact angle measurements show that the wetting behavior of these surfaces change significantly with film thickness. The apparent advancing contact angle increases from 110° for the flat 1-dodecanethiol-coated gold surface to 150° for the film with a close-packed array of hemispherical cavities, in good agreement with the behavior predicted by the simple Cassie-Baxter equation. In contrast, the apparent receding angles have significantly smaller values in all cases, and water droplets are strongly pinned at the surface. Thus, these surfaces demonstrate "rose petal" behavior, in which a large apparent advancing contact angle, typical of a superhydrophobic surface, is accompanied by significant contact angle hysteresis. Observation of the shapes of drops on the surface during evaporation-driven recession shows that the drops adopt a dodecagonal shape, in which the drop perimeter is selectively pinned along the ⟨10⟩ and ⟨11⟩ directions on the hexagonally close-packed surface.

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“…This is consistent with the work of Zhu et al, who used a similar surface of “microbowl arrays” and also Birembaut et al. with square pyramidal pits …”

Section: Resultssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Wetting of Surfaces Made of Hydrophobic Cavities

2015

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“…The sample for SERS measurements was obtained by deposition and evaporation of a droplet of eumelanin solution onto a commercially available Klarite SERS substrate (currently manufactured by Renishaw Diagnostic). Such substrate consists of gold coated nanostructured silicon holes arranged according to a square lattice framework [24,25]. An optical image of the SERS substrate before and after droplet deposition and solvent evaporation (i.e.…”

Section: Methodsmentioning

confidence: 99%

“…Despite of the advantages of the SERS technique, a main drawback is related to the difficulties in fabricating a reliable, high sensitive and reproducible (uniformly roughened) nanoscale substrate, onto which the biopolymer can be deposited and from which repeatable SERS signal can be collected. Among the commercially available SERS substrates, a suitable sample for signal reproducibility and enhancement is a gold nanostructured one known as "Klarite" substrate [24,25]. In fact, manufacturer tests report relative standard deviations in signal levels of <10% with laser excitation at 633 or 785 nm [26], although information about SERS signal reproducibility with Klarite substrates are scarcely presented in the literature.…”

Section: Introductionmentioning

confidence: 99%

Vibrational Characterization of Synthetic Eumelanin by Means of Raman and Surface Enhanced Raman Scattering

Perna¹

2013

TOSURSJ

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Eumelanin biopolymer synthetized from L-DOPA has been characterized by Raman and Surface Enhanced Raman Spectroscopy (SERS). Although Raman spectra of eumelanin were scarcely resolved, SERS measurements of this biopolymer on nanostructured gold substrate, provided a large enhancement of vibrational peaks related to functional groups adherent to the substrate, so that well resolved vibrational spectra were obtained. The SERS peaks correspond to vibrational modes related to the monomeric units of eumelanin. So, SERS spectra can be used to identify the monomeric content of eumelanin and resolve the presence of vibrational modes which have been calculated and predicted according to different theoretical models and previously observed in vibrational spectra of single monomeric units.

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“…In this example, the organic content remaining at a given position along the bipolar surface directly depends on the applied voltage. The introduction of greater complexity could be achieved by combining such an approach with surface structuration, especially with the objective of developing new potential applications in optics or catalysis.…”

Section: Resultsmentioning

confidence: 99%

Modulation of Wetting Gradients by Tuning the Interplay between Surface Structuration and Anisotropic Molecular Layers with Bipolar Electrochemistry

et al. 2017

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A new simple and versatile method for the preparation of surface‐wetting gradients is proposed. It is based on the combination of electrode surface structuration introduced by a sacrificial template approach and the formation of a tunable molecular gradient by bipolar electrochemistry. The gradient involves the formation of a self‐assembled monolayer on a gold surface by selecting an appropriate thiol molecule and subsequent reductive desorption by means of bipolar electrochemistry. Under these conditions, completion of the reductive desorption process evolves along the bipolar surface with a maximum strength localized at the cathodic edge and a decreasing driving force towards the middle of the surface. The remaining quantity of surface‐immobilized thiol, therefore, varies as a function of the axial position, resulting in the formation of a molecular gradient. The surface of the bipolar electrode is characterized at each step of the modification by recording heterogeneous electron transfer. Also, the evolution of static contact angles measured with a water droplet deposited on the surface directly reveals the presence of the wetting gradient, which can be modulated by changing the properties of the thiol. This is exemplified with a long, hydrophobic alkane–thiol and a short, hydrophilic mercaptan.

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Sharp‐Cornered Liquid Drops by Wetting of Nanoscale Features

Cited by 5 publications

References 9 publications

Wetting of Surfaces Made of Hydrophobic Cavities

Wetting of Surfaces Made of Hydrophobic Cavities

Vibrational Characterization of Synthetic Eumelanin by Means of Raman and Surface Enhanced Raman Scattering

Modulation of Wetting Gradients by Tuning the Interplay between Surface Structuration and Anisotropic Molecular Layers with Bipolar Electrochemistry

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