Mimicking natural superhydrophobic surfaces and grasping the wetting process: A review on recent progress in preparing superhydrophobic surfaces

Yan, Yuying; Gao, Nan; Barthlott, Wilhelm

doi:10.1016/j.cis.2011.08.005

Cited by 902 publications

(624 citation statements)

References 198 publications

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“…209 Studying these organism's wetting properties has led to countless approaches to create multifunctional materials with tunable wettability for applications ranging from self-cleaning repellent surfaces to antifogging coatings. Colloids offer a unique platform to understand and control the wetting of liquids on surfaces for various applications because they can systematically modify multiple parameters of the surface with simple methods.…”

Section: Wetting Applicationsmentioning

confidence: 99%

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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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Section: Wetting Applicationsmentioning

confidence: 99%

“…209 There are generally three parameters fundamental to achieving a desired surface wetting state: surface roughness, re-entrant geometry of the roughness features, and surface energy. Colloidal particles assembled on a substrate allow for the direct control of all three of these parameters.…”

Section: Wetting Applicationsmentioning

confidence: 99%

A colloidoscope of colloid-based porous materials and their uses

et al. 2016

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“…glass, a course surface structure, like the one presented by Gerber and Tuma [22], would affect the transparency of the product. However, there are developed other methods that also employs a rough surface structure in order to achieve self-cleaning properties, which in addition achieves an optical transmission of above 90 %, as for regular clear float gass [27]. Nonetheless, if the transmission is affected or not, a self-cleaning surface like the one presented in Figure 9, might be applicaple to fenestration products made of e.g.…”

Section: Pursue a Coarse Micro-structure Surfacementioning

confidence: 99%

“…The possibilities of the Lotus leaf with its hydrophobicity is investigated in several studies [25,34,35,45], and superhydrophobicity (including ultrahydrophobicity [42]) is furthermore the topic of yet several more studies [11,27,34,36,37,39,40,42,43,44,46], where links to nanostructure of the matter and hence nanotechnology are given in various works [1,12,33,35,40,45]. The large collection of water-repellent and self-cleaning plant surfaces with corresponding contact angles by Neinhuis and Barthlott (1997) [41] should be noted.…”

Section: Pursue Superhydrophobic Surface Characteristicsmentioning

confidence: 99%

“…Illustration of how self-cleaning glass works, in three steps, from left to right: 1) activation of the coating by UV radiation and natural dirtying, 2) decomposition of the organic dirt, and 3) rain water washes away the loosened and degraded dirt. Source: Pilkington Active [6] Several investigations have been carried out on hydrophilic and hydrophobic surfaces with their respective superhydrophilic and superhydrophobic counterparts or enhancements, and on self-cleaning properties and various possible application areas in general [1,2,5,10,11,12,22,24,25,27,33,34,35,36,37,38,39,40,41,42,43,44,45,46]. It is not within the scope of this work to go into details of all these, as the focus of this work is on self-cleaning characterization methods, state-of-the-art self-cleaning glazing products of today and future research pathways for self-cleaning glazing products of tomorrow.…”

Section: Theory Behind the Self-cleaning Effect Of Glazing Productsmentioning

confidence: 99%

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Self-cleaning glazing products: A state-of-the-art review and future research pathways

Midtdal

Jelle

2013

Solar Energy Materials and Solar Cells

175

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Self-cleaning technology is used in a variety of products today, with glazing products being the foremost area of application. However, there are several self-cleaning technologies in use and their self-cleaning efficiency may be unclear. This study aims to give a comprehensive state-of-the-art review of the self-cleaning glazing products available on the market today and investigate methods for measuring the self-cleaning effect. Various future research pathways and opportunities for the self-cleaning products of tomorrow are also explored within this study, with emphasis on solar energy application areas such as daylight, solar radiation transmission, electrochromism, building integrated photovoltaics (BIPV), solar cell glazing and solar cells in general. Self-cleaning products from several manufacturers that utilize two different self-cleaning technologies of either photocatalytic hydrophilic or hydrophobic capability are presented. The photocatalytic hydrophilic products in question are self-cleaning glazing products ready-to-use when purchased, whilst the presented hydrophobic products are coatings that must be applied to existing glazing products in order to yield a water-repellent and self-cleaning surface. It is stated that the self-cleaning action of the photocatalytic hydrophilic products is evident through 25 to 30 years, even during dry spills, and that they are able to maintain a cleaner surface than ordinary untreated float glass. However, the selfcleaning action of hydrophobic-coated products is limited by a relatively short life expectancy of about 3-4 years, and their self-cleaning performance is found to be feeble compared to ordinary untreated float glass. Nonetheless, the potential for future use of both self-cleaning technologies are apparent, with focus on alternative application areas such as solar cells, BIPV and information display devices, which indeed could benefit from utilizing the selfcleaning technology. Visions for future self-cleaning products are also discussed, which combine self-cleaning abilities with photovoltaism and electrochromism, whereupon the applicability of the self-cleaning technology may be greatly increased.

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Superhydrophobic Polymers

Wolfs

Darmanin

2013

Encyclopedia of Polymer Science and Technology

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Antiwetting materials have been widely studied because of their potential applications in several fields. Polymeric materials are of special interest because they provide advantages including ease of processability and cost. This article introduces basic wetting theories and overviews the main techniques to produce superhydrophobic polymers, such as templating, molding, self‐assembly, soft lithography, layer‐by‐layer deposition, precipitation and crystallization, electrospinning, and electrochemical polymerization. For each method, representative examples as well as practical advantages and disadvantages are also presented.

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Mimicking natural superhydrophobic surfaces and grasping the wetting process: A review on recent progress in preparing superhydrophobic surfaces

Cited by 902 publications

References 198 publications

A colloidoscope of colloid-based porous materials and their uses

A colloidoscope of colloid-based porous materials and their uses

Self-cleaning glazing products: A state-of-the-art review and future research pathways

Superhydrophobic Polymers

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