Robust self-cleaning surfaces that function when exposed to either air or oil

Lu, Yao; Sathasivam, Sanjayan; Song, Jinlong; Crick, Colin R.; Carmalt, Claire J.; Parkin, Ivan P.

doi:10.1126/science.aaa0946

Cited by 1,611 publications

(1,043 citation statements)

References 27 publications

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“…In particular, biofouling on the surface is a serious issue for underwater vehicles as it incurs additional frictional drag and considerable maintenance effort. Nevertheless, we expect that these issues can be overcome eventually with a rapid development of low-cost micro-and nanofabrication techniques (Ahn and Guo 2009), the development of regenerative SHPo surfaces , damage-tolerant SHPo surfaces (Lu et al 2015), rare-oxide-based hydrophobic coatings (Azimi et al 2013), and the functioning of SHPo surfaces as anti-biofouling surfaces (Genzer and Efimenko 2006). Lastly, oil-infused nanostructured surfaces (Wong et al 2011), which have attracted much interest for their liquid repellency as well as their stability under a high liquid pressure, have been hailed as an alternative to the SHPo surface.…”

Section: Discussionmentioning

confidence: 99%

Superhydrophobic drag reduction in laminar flows: a critical review

2016

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Section: Discussionmentioning

confidence: 99%

Superhydrophobic drag reduction in laminar flows: a critical review

2016

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“…237 A simple spray coating of metal oxide colloids combined with a perfluoroacrylic polymer emulsion or fluorosilane has recently been used to easily create superoleophobic coatings as well ( Figure 14C). 84,215,238 These methods are promising candidates for omniphobic coatings for applications where transparency is not a design criterion, such as for drag reduction in pipelines. polymethylmethacrylate (PMMA).…”

Section: Factors Affecting Wetting Applicationsmentioning

confidence: 99%

A colloidoscope of colloid-based porous materials and their uses

et al. 2016

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Nature evolved a variety of hierarchical structures that produce sophisticated functions. Inspired by these natural materials, colloidal self-assembly provides a convenient way to produce structures from simple building blocks with a variety of complex functions beyond those found in nature. In particular, colloid-based porous materials (CBPM) can be made from a wide variety of materials. The internal structure of CBPM also has several key attributes, namely porosity on a sub-micrometer length scale, interconnectivity of these pores, and a controllable degree of order. The combination of structure and composition allow CBPM to attain properties important for modern applications such as photonic inks, colorimetric sensors, self-cleaning surfaces, water purification systems, or batteries. This review summarizes recent developments in the field of CBPM, including principles for their design, fabrication, and applications, with a particular focus on structural features and materials' properties that enable these applications. We begin with a short introduction to the wide variety of patterns that can be generated by colloidal self-assembly and templating processes. We then discuss different applications of such structures, focusing on optics, wetting, sensing, catalysis, and electrodes. Different fields of applications require different properties, yet the modularity of the assembly process of CBPM provides a high degree of tunability and tailorability in composition and structure. We examine the significance of properties such as structure, composition, and degree of order on the materials' functions and use, as well as trends in and future directions for the development of CBPM.

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“…[1][2][3][4][5][6][7][8] Superhydrophobicity was rst observed by Ollivier in 1907 but received limited attention until 1997, with the publication of the existence of the "lotus effect" in nature. 9 One of the most widely accepted theories on surface wettability was published in 1805 by Young, 10 which denes the relationship between water contact angle and surface energy on smooth and chemically homogeneous surfaces, whilst the Wenzel 11 and Cassie-Baxter 12 models consider the surface roughness effects on water repellence.…”

Section: Introductionmentioning

confidence: 99%

Wettability of hierarchically-textured ceramic coatings produced by suspension HVOF spraying

et al. 2015

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A novel but simple path for the preparation of superhydrophobic and superhydrophilic coatings has been demonstrated via a recently developed technology, namely suspension high velocity oxy-fuel spraying.Potential uses for robust superhydrophobic coatings include antifouling applications such as aeroplane wings, ship hulls, offshore wind turbine blades, or the above-deck structures on ice breaker vessels.Several fabrication techniques have been reported for preparing inorganic superhydrophobic surfaces, but existing coatings either lack the necessary robustness for engineering applications and/or their deposition methods are not suitable for industrial scale-up. In this work, the industrially established HVOF coating process was adapted to use a liquid suspension of commercially available nano-particles (titania-TiO 2 , and hexagonal boron nitride-h-BN) as feedstock to produce nanostructured suspension HVOF TiO 2 /h-BN coatings for the first time on stainless steel. Results indicate that agglomerates in the nano-feedstock can be dispersed by h-BN due to poor mutual wettability between h-BN and molten TiO 2 . It also inhibits the anatase-to-rutile transformation of TiO 2 during coating deposition by inhibiting sintering of TiO 2 in the HVOF flame. The resultant coating becomes superhydrophobic when the addition of h-BN reaches 10 wt% due to the presence of hierarchical nano-texture on the surface. The superhydrophobicity (contact angle of 163-170 ) is maintained over a long period of time (>13 months, test still ongoing) and remains stable after exposure to light and tape test. A potential route for industrial preparation of robust water-repellent coatings is therefore highlighted by the study.

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Robust self-cleaning surfaces that function when exposed to either air or oil

Cited by 1,611 publications

References 27 publications

Superhydrophobic drag reduction in laminar flows: a critical review

Superhydrophobic drag reduction in laminar flows: a critical review

A colloidoscope of colloid-based porous materials and their uses

Wettability of hierarchically-textured ceramic coatings produced by suspension HVOF spraying

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