Some thoughts on superhydrophobic wetting

Dorrer, Christian; Rühe, Jürgen

doi:10.1039/b811945g

Cited by 344 publications

(326 citation statements)

References 127 publications

(201 reference statements)

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“…8 Maintaining stable air pockets, however, is challenging: the air pockets can be collapsed by external wetting 45 pressures [8][9][10][11] , can diffuse away into the surrounding liquid 12-14 , can lose robustness upon damage to the texture 1,5 and may be displaced by low surface tension liquids unless special texture design is implemented. 3 Furthermore, condensation or frost nuclei, which can form at the nanoscale throughout the texture, 50 can completely transform the wetting properties and render the textured surface highly wetting [15][16][17][18] .…”

Section: Introductionmentioning

confidence: 99%

Droplet mobility on lubricant-impregnated surfaces

et al. 2013

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Section: Introductionmentioning

confidence: 99%

Droplet mobility on lubricant-impregnated surfaces

et al. 2013

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“…Plastrons on immersed artificial superhydrophobic surfaces have been under active study as well (5)(6)(7)(8)(9). Because the formation of an air layer between water and the surface is the essential feature of superhydrophobic surfaces in general, a transition from a state with an air layer (Cassie state) to a state where it is lost (Wenzel state) means loss of nonwetting properties (10,11). Therefore, superhydrophobic surfaces are typically designed to provide the most stable Cassie state possible using hydrophobic surface chemistry and rough microtopography (12).…”

mentioning

confidence: 99%

Reversible switching between superhydrophobic states on a hierarchically structured surface

Verho

Korhonen

Sainiemi

et al. 2012

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

252

256

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Nature offers exciting examples for functional wetting properties based on superhydrophobicity, such as the self-cleaning surfaces on plant leaves and trapped air on immersed insect surfaces allowing underwater breathing. They inspire biomimetic approaches in science and technology. Superhydrophobicity relies on the Cassie wetting state where air is trapped within the surface topography. Pressure can trigger an irreversible transition from the Cassie state to the Wenzel state with no trapped air-this transition is usually detrimental for nonwetting functionality and is to be avoided. Here we present a new type of reversible, localized and instantaneous transition between two Cassie wetting states, enabled by two-level (dual-scale) topography of a superhydrophobic surface, that allows writing, erasing, rewriting and storing of optically displayed information in plastrons related to different length scales.micropillars | silicone nanofilaments | optical data storage | bistable | two-tier

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“…[8][9][10][11][12] However, accurate evaluation of static contact angle for superhydrophobic surface is not trivial. [8][9][10][11] Even for the images with similar drop shape, the differences in the evaluated static contact angle by different researchers may be up to dozens of degrees. 8 The algorithm selection first and foremost must be addressed.…”

Section: Introductionmentioning

confidence: 99%

“…9 An uncertainty of as small as 1µm in the measurement of the height or location of the baseline may result in an uncertainty of 10 • in the evaluated contact angle. 15 However, for a superhydrophobic water drop image, one pixel may correspond to several µm at a certain image resolution.…”

Section: Introductionmentioning

confidence: 99%

A noise-resistant ADSA-PH algorithm for superhydrophobic surface’s static contact angle evaluation

Zhi-niu

2017

AIP Advances

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The blur around the contact points significantly decreases the evaluated static contact angle for superhydrophobic surface which is clearly presented in the paper. To improve the accuracy in the evaluated static contact angle for superhydrophobic surface, an accurate static contact angle algorithm, namely ADSA-PH (axisymmetric drop shape analysis-profile and height), is proposed. It discards the extracted drop edge points close to the contact points and makes use of the residual points and the drop height to determine the static contact angle. The contact angle errors caused by the blur close to the contact points are significantly reduced. The classical ADSA-P algorithm, the modified selected-plane method and the proposed algorithm are used to evaluate static contact angle. The results validate the proposed algorithm. The accuracy in the evaluated contact angle increases with increasing image resolution. To reduce the error caused by a limitation of image resolution, the minimum allowable image resolutions are presented.

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Some thoughts on superhydrophobic wetting

Cited by 344 publications

References 127 publications

Droplet mobility on lubricant-impregnated surfaces

Droplet mobility on lubricant-impregnated surfaces

Reversible switching between superhydrophobic states on a hierarchically structured surface

A noise-resistant ADSA-PH algorithm for superhydrophobic surface’s static contact angle evaluation

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