Non-adhesive lotus and other hydrophobic materials

Quéré, David; Reyssat, Mathilde

doi:10.1098/rsta.2007.2171

Cited by 152 publications

(56 citation statements)

References 66 publications

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“…[1][2][3] Superantiwetting surfaces such as superhydrophobic and superoleophobic surfaces (that display contact angles with water or oil droplets larger than 150 ) are one of the most extensively studied in this field. [4][5][6][7][8][9][10][11] In learning from nature two key surface parameters, surface energy, 12 and roughness, [13][14][15][16] are studied in depth. A number of artificial superhydrophobic surfaces have been developed, 2,[17][18][19][20][21][22][23][24] and these materials have broad applications in self-cleaning, anti-icing, antifogging, antifouling, and drag reduction.…”

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confidence: 99%

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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confidence: 99%

Recent developments in polymeric superoleophobic surfaces

Zhang

Liu

Jiang

2012

J Polym Sci B Polym Phys

226

168

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“…Moreover, we first solved Eqs. (1), (12), and (13) for several representative cases. It turned out that the effect of thermal expansion, i.e., a non-uniform density qðTÞ, was negligibly small.…”

Section: Results From Heat-transfer Modelmentioning

confidence: 99%

“…Ogawa et al and many others rendered substrates superhydrophobic. [10][11][12][13] Similar to lotus leaves, the liquid-solid interfacial area is substantially reduced, thereby only few degrees of inclination are sufficient to make a droplet slide. 10 A prominent application is self-cleaning surface coatings.…”

Section: Numerical Simulations I Introductionmentioning

confidence: 99%

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Enhancement of contact line mobility by means of infrared laser illumination. II. Numerical simulations

Wedershoven

Tempel

Zeegers

et al. 2016

Journal of Applied Physics

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A droplet that moves on a solid substrate with a velocity higher than a certain critical velocity disintegrates, i.e., leaves behind residual droplets. Infrared laser illumination can be used to increase the droplet mobility and suppress the shedding of droplets. By means of two-dimensional numerical simulations, we studied the effect of a non-uniform temperature distribution on the dynamics of straight receding contact lines. A streamfunction-vorticity model is used to describe the liquid flow in the vicinity of the receding contact line. The model takes into account the thermocapillary shear stress and the temperature-dependent liquid viscosity and density. A second, coupled model describes the laser-induced displacement of the contact line. Our results show that the reduction of the liquid viscosity with increasing temperature is the dominant mechanism for the increase of the critical velocity. Thermocapillary shear stresses are important primarily for low substrate speeds. V C 2016 AIP Publishing LLC. [http://dx

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“…In this case, the solid-liquid contact vanishes and the liquid cannot be pinned anymore on the solid defects, which also yields a zero contact angle hysteresis. 36 In Table 1, a summary of the catalyst layer configurations, the resultant morphology and patterning of VA-MWCNTs and their wettability properties are given.…”

Section: -30mentioning

confidence: 99%

Simultaneous growth of self-patterned carbon nanotube forests with dual height scales

et al. 2012

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In this study, we report on a unique, one-step fabrication technique enabling the simultaneous synthesis of vertically aligned multi-walled carbon nanotubes (VA-MWCNTs) with dual height scales through alcohol catalyzed chemical vapor deposition (ACCVD). Regions of VA-MWCNTs with different heights were well separated from each other leading to a self-patterning on the surface. We devised a unique layer-by-layer process for application of catalyst and inhibitor precursors on oxidized Si (100) surfaces before the ACCVD step to achieve a hierarchical arrangement. Patterning could be controlled by adjusting the molarity and application sequence of precursors. Contact angle measurements on these self-patterned surfaces indicated that manipulation of these hierarchical arrays resulted in a wide range of hydrophobic behavior changing from that of a sticky rose petal to a lotus leaf.Inspired by the self-cleaning effect of lotus leaves, researchers have paid increasing attention to the generation of superhydrophobic surfaces having hierarchical structures with features ranging from micro-to nanoscale. The lotus leaf has a highly textured surface with protruding nubs (20-40 mm) which are further covered with nanometre sized wax crystals.1 Lotus leaf-like surfaces can be created either by covering a rough surface with a low surface energy material or by roughening/ etching/patterning the surface of a hydrophobic material. 10,11Functionalized vertically aligned multi-walled carbon nanotube (VA-MWCNT) arrays synthesized by CVD have also demonstrated superhydrophobic properties. 9,12Moreover, combining the CVD technique with photolithography for generating patterned carbon nanotube (CNT) arrays on surfaces has also been shown to improve and tailor superhydrophobicity of these surfaces.13 However, additional steps such as patterning with lithography for creating complex structures to improve hydrophobic behavior or imparting self-cleaning properties are not often cost efficient. Therefore, a simple, one-step production technique is required for the generation of artificial lotus leaf-like surfaces.Hence, the aim of this study is to imitate lotus leaf structures by creating dual-scale micro/nanostructures of aligned and patterned CNTs during the growth. For this purpose, we developed a unique technique based on the layer-by-layer application of catalyst and inhibitor precursors which is normally used to grow VA-MWCNTs by our group.14 By tuning the molarity, types, sequence and number of precursor and catalyst layers, we were able to not only generate hierarchical and patterned superhydrophobic VA-MWCNT arrays but also tailor the wettability properties. The resultant hierarchical structures were fully characterized (contact angle, surface topography, physical properties, and geometry) in order to identify the contribution of micro-and nano-structured aspects on water repellency. These hierarchical CNT arrays with micro-and nanoscales can be further developed to potentially find applications as self-cleaning dry-adhesives (gecko ...

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Non-adhesive lotus and other hydrophobic materials

Cited by 152 publications

References 66 publications

Recent developments in polymeric superoleophobic surfaces

Recent developments in polymeric superoleophobic surfaces

Enhancement of contact line mobility by means of infrared laser illumination. II. Numerical simulations

Simultaneous growth of self-patterned carbon nanotube forests with dual height scales

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