A Convenient Method to Produce Close‐ and Non‐close‐Packed Monolayers using Direct Assembly at the Air–Water Interface and Subsequent Plasma‐Induced Size Reduction

Vogel, Nicolas; Goerres, Sebastian; Landfester, Katharina; Weiss, Clemens K.

doi:10.1002/macp.201100187

Cited by 247 publications

(304 citation statements)

References 60 publications

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“…The key challenge in designing highly repellent lubricant-infused structured surfaces by colloidal templating is the ability to homogeneously cover large areas of solid substrates with colloidal monolayers. In our approach, we preassemble colloids at the air/water interface and subsequently transfer them to the desired substrates 33,34 . The liquid nature of the interface provides fluidity necessary to achieve high order and uniform coverage and inherently confines the colloids to a two-dimensional layer.…”

Section: Resultsmentioning

confidence: 99%

“…This avoids the formation of multilayers that might act as pinning points for applied test liquids and compromise repellency. Additionally, the process allows for uniformly depositing colloidal monolayers over large areas, limited only by the dimensions of the water's surface, and is able to cover curved or topographically structured surfaces [33][34][35] . Figure 1a schematically shows the construction of a SLIPS coating from a colloidal template.…”

Section: Resultsmentioning

confidence: 99%

“…Colloidal monolayers were crystallized on the air-water interface of a crystallization dish following a protocol from literature 34 . Briefly, a colloidal dispersion in 1:1 water/ethanol (solid content B2.5%) was spread onto the interface via a glass slide until the surface was completely covered.…”

Section: Methodsmentioning

confidence: 99%

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Transparency and damage tolerance of patternable omniphobic lubricated surfaces based on inverse colloidal monolayers

Vogel

Belisle²,

Hatton³

et al. 2013

Nat Commun

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A transparent coating that repels a wide variety of liquids, prevents staining, is capable of selfrepair and is robust towards mechanical damage can have a broad technological impact, from solar cell coatings to self-cleaning optical devices. Here we employ colloidal templating to design transparent, nanoporous surface structures. A lubricant can be firmly locked into the structures and, owing to its fluidic nature, forms a defect-free, self-healing interface that eliminates the pinning of a second liquid applied to its surface, leading to efficient liquid repellency, prevention of adsorption of liquid-borne contaminants, and reduction of ice adhesion strength. We further show how this method can be applied to locally pattern the repellent character of the substrate, thus opening opportunities to spatially confine any simple or complex fluids. The coating is highly defect-tolerant due to its interconnected, honeycomb wall structure, and repellency prevails after the application of strong shear forces and mechanical damage. The regularity of the coating allows us to understand and predict the stability or failure of repellency as a function of lubricant layer thickness and defect distribution based on a simple geometric model.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Transparency and damage tolerance of patternable omniphobic lubricated surfaces based on inverse colloidal monolayers

Vogel

Belisle²,

Hatton³

et al. 2013

Nat Commun

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393

420

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“…111,112 They can also be pre-assembled at a liquid interface and subsequently transferred to a solid substrate. [113][114][115][116] The choice of assembly technique depends on the requirements with respect to the area to be coated, which have recently been discussed in detail. 52,117 Colloidal monolayers can be especially valuable as templates or masks for etching or evaporation processes to create functional surface nanostructures or coatings.…”

Section: (D) Multiple Porositiesmentioning

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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“…4 A-C-following a protocol from the literature (40). This monolayeron-microbead architecture, shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Color from hierarchy: Diverse optical properties of micron-sized spherical colloidal assemblies

Vogel

Utech

England

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

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Materials in nature are characterized by structural order over multiple length scales have evolved for maximum performance and multifunctionality, and are often produced by self-assembly processes. A striking example of this design principle is structural coloration, where interference, diffraction, and absorption effects result in vivid colors. Mimicking this emergence of complex effects from simple building blocks is a key challenge for manmade materials. Here, we show that a simple confined selfassembly process leads to a complex hierarchical geometry that displays a variety of optical effects. Colloidal crystallization in an emulsion droplet creates micron-sized superstructures, termed photonic balls. The curvature imposed by the emulsion droplet leads to frustrated crystallization. We observe spherical colloidal crystals with ordered, crystalline layers and a disordered core. This geometry produces multiple optical effects. The ordered layers give rise to structural color from Bragg diffraction with limited angular dependence and unusual transmission due to the curved nature of the individual crystals. The disordered core contributes nonresonant scattering that induces a macroscopically whitish appearance, which we mitigate by incorporating absorbing gold nanoparticles that suppress scattering and macroscopically purify the color. With increasing size of the constituent colloidal particles, grating diffraction effects dominate, which result from order along the crystal's curved surface and induce a vivid polychromatic appearance. The control of multiple optical effects induced by the hierarchical morphology in photonic balls paves the way to use them as building blocks for complex optical assemblies-potentially as more efficient mimics of structural color as it occurs in nature.self-assembly | colloids | photonic crystal | structural color | hierarchy H ierarchical design principles, i.e., the structuration of material over multiple length scales, are ubiquitously used in nature to maximize functionality from a limited choice of available components. Hierarchically structured materials often provide better performance than their unstructured counterparts and novel properties can arise solely from the multiscale structural arrangement. Examples can be found in the extreme water repellency of the lotus leaf (1); the outstanding mechanical stability and toughness of sea creatures such as sea sponges (2) and abalone shells (3); and the bright coloration found in beetles, birds, and butterflies (4, 5).To achieve the strongest visual effects, many organisms combine optical effects arising from light interacting with structured matter at different length scales (6). Structural periodicity on the scale of visible light wavelengths can result in regular optical density variations that give rise to bright, iridescent colors due to pronounced interference effects (4). At the micron scale, regular structural features act as diffraction gratings that produce vivid, rainbow coloration (7) and are used to control scatteri...

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A Convenient Method to Produce Close‐ and Non‐close‐Packed Monolayers using Direct Assembly at the Air–Water Interface and Subsequent Plasma‐Induced Size Reduction

Cited by 247 publications

References 60 publications

Transparency and damage tolerance of patternable omniphobic lubricated surfaces based on inverse colloidal monolayers

Transparency and damage tolerance of patternable omniphobic lubricated surfaces based on inverse colloidal monolayers

A colloidoscope of colloid-based porous materials and their uses

Color from hierarchy: Diverse optical properties of micron-sized spherical colloidal assemblies

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