Direct Three‐Dimensional Imaging of the Buried Interfaces between Water and Superhydrophobic Surfaces

Luo, Cheng; Zheng, Hua De; Wang, Lei; Fang, Haiping; Hu, Jun; Chen, Fan; Cao, Yong; Wang, Jian

doi:10.1002/ange.201002470

Cited by 19 publications

(22 citation statements)

References 33 publications

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“…1 C and D) (28). To verify that the results are not influenced by the dye (46,47), some measurements were repeated with pure water in reflection mode. A dry objective (40×/0.85) was used because it allows to accurately measure the optical path length in air, i.e., the thickness of the air cushion.…”

Section: Methodsmentioning

confidence: 99%

How superhydrophobicity breaks down

Papadopoulos

Mammen

Deng

et al. 2013

Proc. Natl. Acad. Sci. U.S.A.

432

442

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A droplet deposited or impacting on a superhydrophobic surface rolls off easily, leaving the surface dry and clean. This remarkable property is due to a surface structure that favors the entrainment of air cushions beneath the drop, leading to the so-called Cassie state. The Cassie state competes with the Wenzel (impaled) state, in which the liquid fully wets the substrate. To use superhydrophobicity, impalement of the drop into the surface structure needs to be prevented. To understand the underlying processes, we image the impalement dynamics in three dimensions by confocal microscopy. While the drop evaporates from a pillar array, its rim recedes via stepwise depinning from the edge of the pillars. Before depinning, finger-like necks form due to adhesion of the drop at the pillar's circumference. Once the pressure becomes too high, or the drop too small, the drop slowly impales the texture. The thickness of the air cushion decreases gradually. As soon as the water-air interface touches the substrate, complete wetting proceeds within milliseconds. This visualization of the impalement dynamics will facilitate the development and characterization of superhydrophobic surfaces.micropillars | pinning | wetting transition | contact angle | lithography | self-cleaning | hysteresis

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Section: Methodsmentioning

confidence: 99%

How superhydrophobicity breaks down

Papadopoulos

Mammen

Deng

et al. 2013

Proc. Natl. Acad. Sci. U.S.A.

432

442

View full text Add to dashboard Cite

show abstract

“…[a] TCMS TCMS/PFDTS Oberflächen-spannung [b] CA [8] SA [8] CA [8] SA [8] [ 38 geneigten Oberfläche ab (Film S2). Dies kann einer Luftschicht zwischen der Festkörperoberfläche und der Flüssig-keit zugeordnet werden, [17] mit anderen Worten, die Tropfen befinden sich im Cassie-Baxter-Zustand. Selbst Flüssigkeits-strahlen von Toluol und Decan wurden von der Oberfläche reflektiert, ohne eine Spur zu hinterlassen (Abbildung 4 a und Film S3).…”

Section: Methodsunclassified

Superoleophobe Silicon‐Beschichtungen mit ultrakleinen Abrollwinkeln

Zhang

Seeger

2011

Angewandte Chemie

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“…The liquid droplets could easily roll off from the slightly tilted (38) TCMS/PFDTS-coated glass slides (Supporting Information, Movie S2). This effect can be attributed to the existence of the air cushion between the solid surface and the liquids, [17] and all of the liquid droplets are in the Cassie-Baxter state. Even jets of toluene and decane could bounce off the TCMS/PFDTS Figure 3.…”

Section: Junping Zhang and Stefan Seegermentioning

confidence: 98%