A robust superhydrophobic and superoleophobic surface with inverse-trapezoidal microstructures on a large transparent flexible substrate

Im, Maesoon; Im, Hown; Lee, Joohyung; Yoon, Jun‐Bo; Choi, Yang Kyu

doi:10.1039/b925970h

Cited by 324 publications

(301 citation statements)

References 31 publications

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“…To reduce the surface energy and render the surfaces superhydrophobic, a Teflon AF solution (PTFE) was spin coated on the samples. 43 Because of the PTFE C-F chains, the PTFE-modified surfaces exhibited hydrophobicity. The static water CAs of the ZnO NRs, 100-μm pitch Si MPs, ZnO/Si HR sample A (8-μm long NRs/100-μm pitch MPs) and ZnO/Si HR sample B (17-μm long NRs/50-μm pitch MPs) were 152°, 114°, 161°and 163°, respectively, as depicted in the inset images in Figures 1a, d, g and j, respectively (more SEM images, transition graph of water CAs and Fourier transform infrared spectrum for the samples before and after PTFE coating were described in Supplementary Information 1,2 and 3).…”

Section: Resultsmentioning

confidence: 99%

Combining the lotus leaf effect with artificial photosynthesis: regeneration of underwater superhydrophobicity of hierarchical ZnO/Si surfaces by solar water splitting

Lee

Yong

2015

NPG Asia Mater

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Fabrication of stable superhydrophobic surfaces in dynamic circumstances is a key issue for practical uses of non-wetting surfaces. However, superhydrophobic surfaces have finite lifetime in underwater conditions due to the diffusion of gas pockets into the water. To overcome this limited lifetime of underwater superhydrophobicity, this study introduces a novel method for regenerating a continuous air interlayer on superhydrophobic ZnO nanorod/Si micropost hierarchical structures (HRs) via the combination of two biomimetic properties of natural leaf: superhydrophobicity from the lotus leaf effect and solar water splitting from photosynthesis. The designed n/p junction in the ZnO/Si HRs allowed for highly stable gas interlayer in water and regeneration of the underwater superhydrophobicity due to the unique ability of the surface to capture and retain a stable gas layer. Furthermore, we developed a model to determine the optimum structural factors of hierarchical ZnO/Si surfaces that aid the formation of an air interlayer to completely regenerate the superhydrophobicity. We also verified that this model satisfactorily predicted the regeneration of underwater superhydrophobicity under various experimental conditions. The regenerative method developed in this work is expected to broaden the range of potential applications involving superhydrophobic surfaces and to create new opportunities for related technologies. NPG Asia Materials (2015) 7, e201; doi:10.1038/am.2015.74; published online 17 July 2015 INTRODUCTIONSuperhydrophobic surfaces that mimic lotus leaves have been extensively studied over the past several decades, and various micro/nanostructures have been developed to create bio-inspired superhydrophobic surfaces. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] In recent years, the non-wetting property of superhydrophobic surfaces submerged in water has attracted much attention because it has potential applications in drag reduction, anti-fouling, anti-corrosion, waterproof devices, microchannels, anti-icing and other non-wetting related applications. [16][17][18][19][20][21][22][23][24][25] Practical applications of non-wetting surfaces, however, have been impeded by the limited stability of their underwater superhydrophobicity. [26][27][28] According to the Cassie-Baxter model, the presence of an air interlayer on the submerged surface causes the non-wetting behavior, and thus, the stability of underwater superhydrophobicity is determined by the lifetime of the air (or gas) interlayer captured by the superhydrophobic surface. 29 However, the gas interlayer is unstable due to diffusion of the gas into the water. 30 According to previous studies, the gas diffusion rates are strongly affected by physical (hydrostatic pressure and micro/nanostructures of the surface) and chemical (surface energy) factors. 26,31

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Section: Resultsmentioning

confidence: 99%

Combining the lotus leaf effect with artificial photosynthesis: regeneration of underwater superhydrophobicity of hierarchical ZnO/Si surfaces by solar water splitting

Lee

Yong

2015

NPG Asia Mater

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“…2(E,F)]. 45 The introduction of overhang structures was thought to play positive role in superoleophobicity.…”

Section: Template Methodsmentioning

confidence: 99%

“…It introduces the requirement for overhang structures, mushroom-like structures, inverse-trapezoidal microstructures, negative slopes, and fibers. 29,[43][44][45][46][47][48][49][50][51][52][53][54] The concept of re-entrant surface curvature was put forward by Tuteja et al 29 In their studies, they synthesized a class of polyhedral oligomeric silsesquioxane (POSS) molecules [the insert of Fig. 2(C)] and fabricated fiber mats with them [ Fig.…”

Section: Special Surface Curvature Structurementioning

confidence: 99%

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Recent developments in polymeric superoleophobic surfaces

Zhang

Liu

Jiang

2012

J Polym Sci B Polym Phys

226

168

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The construction and application of superoleophobic surfaces have aroused worldwide interest during the past few years. These surfaces are of great significance not only for fundamental research but also for various practical applications in self-cleaning, oil-repellent coatings, and antibioadhesion. The unique properties of polymers have made them one of the most important materials for constructing superoleophobic materials. This article reviews recent developments in the design, fabrication, and application of polymeric superoleophobic surfaces.

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“…42,43 Similarly, on a large-size template of the transparent PDMS elastomer surface, 25 perfectly ordered microstructures with an inverse-trapezoidal cross section (Fig. 7e) were fabricated by Im et al 44 via two consecutive PDMS replication processes and a three-dimensional diffuser lithography technique. In a recent work reported by Susarrey-Arce and coworkers, 45 35 arrays of microstructures were successfully fabricated by reactive ion etching of a silicon wafer, which was covered by a patterned photoresist layer.…”

Section: Lithographymentioning

confidence: 99%

Superamphiphobic surfaces

2014

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Superamphiphobicity is an effect where surface roughness and surface chemistry combine to generate surfaces which are both superhydrophobic and superoleophobic, i.e., contact angles (yCA) greater than 1501 along with low contact angle hysteresis (CAH) not only towards probing water but also for low-surface-tension 'oils'. In this review, we summarize the research on superamphiphobic surfaces, including the characterization of superamphiphobicity, different techniques towards the fabrication of surface roughness and surface modification with low-surface-energy materials as well as their functional applications. Superamphiphobicity is an effect where surface roughness and surface chemistry combine to generate 5 surfaces which are both superhydrophobic and superoleophobic, i.e., contact angles ( CA ) greater than 150° along with low contact angle hysteresis (CAH) not only towards probing water but also for lowsurface-tension 'oils'. In this tutorial review, we summarize the research on superamphiphobic surfaces, including the characterization of superamphiphobicity, different techniques towards the fabrication of surface roughness and surface modification with low-surface-energy materials as well as their functional 10 applications.

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A robust superhydrophobic and superoleophobic surface with inverse-trapezoidal microstructures on a large transparent flexible substrate

Cited by 324 publications

References 31 publications

Combining the lotus leaf effect with artificial photosynthesis: regeneration of underwater superhydrophobicity of hierarchical ZnO/Si surfaces by solar water splitting

Combining the lotus leaf effect with artificial photosynthesis: regeneration of underwater superhydrophobicity of hierarchical ZnO/Si surfaces by solar water splitting

Recent developments in polymeric superoleophobic surfaces

Superamphiphobic surfaces

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