Nanonails:  A Simple Geometrical Approach to Electrically Tunable Superlyophobic Surfaces

Ahuja, Abhinav; Taylor, J. Ashley; Lifton, Victor A.; Sidorenko, Alexander; Salamon, Todd; Lobaton, E J; Kolodner, Paul; Krupenkin, Tom N.

doi:10.1021/la702327z

Cited by 316 publications

(322 citation statements)

References 24 publications

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“…Tuteja et al 234 and Krupenkin et al 235 discovered a way to create a highly non-wetting surface for low-surfacetension liquids using an additional parameter called re-entrant geometry. 234,235 Introducing geometry that contains an overhang, or re-entrant curvature, to the roughness features enables these low-surface-tension liquids to remain suspended rather than infiltrating the structures. If the overhang makes an angle smaller than 90° to the flat substrate, low-surface-tension liquids with a larger wetting angle than the overhang angle will de-wet from the structures, 77,216 as shown schematically in Figure 12C advancing force of the liquid upward against gravity, allowing a metastable Cassie-Baxter state to form.…”

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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Section: Factors Affecting Wetting Applicationsmentioning

confidence: 99%

A colloidoscope of colloid-based porous materials and their uses

et al. 2016

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“…Most surfaces that are superoleophobic (displaying apparent contact angles for oil of θ* oil > 150°) are also superhydrophobic 15,18,19 . This is due to the higher surface tension of water, which results in the respective Young's contact angles 20 satisfying θ water > θ oil .…”

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confidence: 99%

“…Recent work 15,18,19,[27][28][29][30] has explained how 're-entrant surface texture' , in conjunction with surface chemistry and roughness, can be used to design superoleophobic surfaces. We have previously discussed the spacing ratio, D*, which is a dimensionless measure of surface porosity 19 .…”

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confidence: 99%

Hygro-responsive membranes for effective oil–water separation

et al. 2012

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There is a critical need for new energy-efficient solutions to separate oil-water mixtures, especially those stabilized by surfactants. Traditional membrane-based separation technologies are energy-intensive and limited, either by fouling or by the inability of a single membrane to separate all types of oil-water mixtures. Here we report membranes with hygro-responsive surfaces, which are both superhydrophilic and superoleophobic, in air and under water. our membranes can separate, for the first time, a range of different oil-water mixtures in a singleunit operation, with >99.9% separation efficiency, by using the difference in capillary forces acting on the two phases. our separation methodology is solely gravity-driven and consequently is expected to be highly energy-efficient. We anticipate that our separation methodology will have numerous applications, including the clean-up of oil spills, wastewater treatment, fuel purification and the separation of commercially relevant emulsions.

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“…Si nanoparticles [1][2][3] Sol-gel Sol gel 165-173 3 1.4x10 5 -1.6x10 6 Si nanopillars [4][5][6] Ca ≤ 3.13x10 -2 , respectively. This condition implies the following: the effect of inertia is stronger than that of gravity, the effect of gravity is comparable to that of surface tension, and the effect viscosity is much less than that of surface tension.…”

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confidence: 99%

Physicochemical Characteristics and Droplet Impact Dynamics of Superhydrophobic Carbon Nanotube Arrays

Aria

Gharib

2014

Langmuir

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The physicochemical and droplet impact dynamics of superhydrophobic carbon nanotube arrays are investigated. These superhydrophobic arrays are fabricated simply by exposing the as-grown carbon nanotube arrays to a vacuum annealing treatment at a moderate temperature. This treatment, which allows a significant removal of oxygen adsorbates, leads to a dramatic change in wettability of the arrays, from mildly hydrophobic to superhydrophobic. Such change in wettability is also accompanied by a substantial change in surface charge and electrochemical properties. Here, the droplet impact dynamics are characterized in terms of critical Weber number, coefficient of restitution, spreading factor, and contact time. Based on these characteristics, it is found that superhydrophobic carbon nanotube arrays are among the best water-repellent surfaces ever reported. The results presented herein may pave a way for the utilization of superhydrophobic carbon nanotube arrays in numerous industrial and practical applications, including inkjet printing, direct injection engines, steam turbines, and microelectronic fabrication.

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Nanonails: A Simple Geometrical Approach to Electrically Tunable Superlyophobic Surfaces

Cited by 316 publications

References 24 publications

A colloidoscope of colloid-based porous materials and their uses

A colloidoscope of colloid-based porous materials and their uses

Hygro-responsive membranes for effective oil–water separation

Physicochemical Characteristics and Droplet Impact Dynamics of Superhydrophobic Carbon Nanotube Arrays

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