Quantitative Testing of Robustness on Superomniphobic Surfaces by Drop Impact

Nguyen, Thi Phuong Nhung; Brunet, Philippe; Coffinier, Yannick; Boukherroub, Rabah

doi:10.1021/la103097y

Cited by 104 publications

(30 citation statements)

References 27 publications

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“…One of the first measurements of the contact angle of ethanol-water mixtures was made by Hoke et al [21] who studied ethanol-water mixtures on paraffin, teflon and polystyrene surfaces in order to characterize the wettability of military fabrics. More recent studies include the measurement of ethanol-water contact angles on silicon nanowires [22], surfaces made up of PDMS-Si 3 N 4 microstructures [23] and zinc oxide nanostructures [24,25].…”

Section: Introductionmentioning

confidence: 99%

Contact angle of ethanol–water solutions on crystalline and mesoporous silicon

Spencer

Andrews

Deacon

2013

Semicond. Sci. Technol.

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Measurements of contact angle of ethanol-water solutions were performed on crystalline silicon and on mesoporous silicon films with porosities up to ∼72%. Water contact angles of 44 • and 76 • were measured for untreated and HF-dipped crystalline silicon, respectively, consistent with previous studies. The contact angle for ethanol-water mixtures was found to decrease with increasing ethanol concentration for both untreated crystalline silicon and also for HF-dipped crystalline silicon up to an ethanol concentration of ∼80%; at higher concentrations the contact angle approached zero. Similar behaviour was observed on mesoporous silicon surfaces for ethanol concentrations 40%, above which the contact angle dropped abruptly to an immeasurably small value. This behaviour is attributed to a decrease in surface tension with increasing ethanol concentration. For all ethanol-water solutions, a minimum value of contact angle was observed at a porosity of ∼40%, above which it remained approximately constant. The behaviour of contact angle with porosity can be explained by a change in the Wenzel roughness parameter due to changes in the specific surface area of the film.

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Section: Introductionmentioning

confidence: 99%

Contact angle of ethanol–water solutions on crystalline and mesoporous silicon

Spencer

Andrews

Deacon

2013

Semicond. Sci. Technol.

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“…a wetting transition might occur under slightly increased pressure or upon impact. 8 In contrast to topographically modified surfaces, flat or smooth surfaces with low contact angle hysteresis are emerging as another type of liquid repellent surface. The groups of McCarthy and Hozumi have independently reported low hysteresis surfaces by covalently bonding silicone oil onto smooth silicon wafers.…”

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confidence: 99%

Perfluoropolyether-infused nano-texture: a versatile approach to omniphobic coatings with low hysteresis and high transparency

et al. 2013

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“…If the complex geometry is damaged or if the surface becomes fouled under conditions of extreme temperature, a loss of function can occur . Lotus‐leaf type structures require that pockets of air exist between the water drops that are to be repelled and the majority of the substrate, meaning that pressure can compress the structure and remove those air pockets . A simpler approach to creating surface repellency is to modify surfaces with perfluorinated acids, which has been widely adopted in products such as food packaging to create water and oil repellency, but chemical modification of flat surfaces alone cannot create truly superhydrophobic or omniphobic surfaces .…”

Section: Introductionmentioning

confidence: 99%

Gel‐Infused Slippery Surface with Enhanced Longevity and Thermally Controllable Sliding Properties

Zhu

Zhang

Wang

et al. 2016

Adv Materials Inter

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extreme conditions is to infuse a liquid or lubricant into a porous structure, creating a solid surface with a thin, smooth liquid layer on top. [ 1,2,16 ] One can think of this strategy as replacing the compressible gas layer that lies between a lotus leaf like surface and the drops it repels with a noncompressible liquid layer. These so-called "slippery surfaces" (also known as SLIPS for slippery liquid infused porous surface) have the additional benefi t that the geometry requirements are not as strict as that of a lotus leaf structure. Such surfaces can repel water as well as oily liquids which are immiscible with the infused lubricant. These surfaces have some degree of selfhealing as the liquid phase can fl ow back into damaged areas, and due to the noncompressibility of the fl uid are less easily damaged under pressure compared to lotus leaf type structures. In addition to being self-cleaning, liquid-infused surfaces have been demonstrated to be useful for delaying ice crystallization, improving condensation, heat transport, and also as being antifouling. [17][18][19][20][21][22][23] While a number of applications have been examined, the range of liquids that have been used for infusion has been relatively limited, mainly to fl uorinated lubricants and silicone oil, and water has also been demonstrated for repellency of oils.Although liquid infused surfaces have superior properties in some aspects, there are limitations as well. One possible improvement which would make the surface even more versatile would be to introduce stimuli-response properties to the surface. Aizenberg and co-workers have developed stressresponsive SLIPS which exhibit completely distinct wetting behavior under stretched and relaxed states. [ 24 ] However, this mechanical stimulus needs to be delivered through stretching which involves direct contact of the surface. In addition, this stress-responsive SLIPS requires the whole surface to be mechanically stretchable, limiting generality. Jiang and coworkers have developed SLIPS with thermally switchable surface adhesion properties, using paraffi n as the lubricant and cross-linked polydimethylsiloxane as the substrate. [ 25 ] However, this method is only viable when the substrate can swell in the lubricant. Moreover, their surface can only switch directly from water pinning to sliding, but fail to exhibit any gradual change in surface wetting properties nor to possess a range of sliding speeds.The most common failure mechanism for SLIPS surfaces is the loss of lubricant over time. [ 26 ] This surface achieves its properties by allowing the liquid to be repelled to fl ow along the surface with the infused lubricant, but the fl ow of lubricant can Smart surfaces with stimuli responsive wetting behavior can potentially be important materials in a number of applications. Demonstrated here is a novel method to fabricate a gel-infused slippery surface by impregnating a nanostructured surface with a gelator containing lubricant, in this case 12-hydroxystearic acid in mineral oil. The resultin...

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Quantitative Testing of Robustness on Superomniphobic Surfaces by Drop Impact

Cited by 104 publications

References 27 publications

Contact angle of ethanol–water solutions on crystalline and mesoporous silicon

Contact angle of ethanol–water solutions on crystalline and mesoporous silicon

Perfluoropolyether-infused nano-texture: a versatile approach to omniphobic coatings with low hysteresis and high transparency

Gel‐Infused Slippery Surface with Enhanced Longevity and Thermally Controllable Sliding Properties

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