In the Stick of It If a coating makes surface nonstick, how do you stick to in first place? For many nonstick coatings, this involves procedures ensure good adhesion underlying though use roughening or intermediary layers. Deng et al. (p. 67 , published online 1 December; see cover) found very simple route using little more than candle soot as temporary sublayer that is coated with silica shell and subsequently removed via calcination. Once top-coated semifluorinated silane, resulting...

Robust transparent superhydrophobic coatings are advantage for convenient and cost-effective maintenance of a variety surfaces. Until today most suffer from poor mechanical stability. Based on porous silica capsules we developed an easy to apply method overcome these limitations. The coating is not only mechanically robust but also highly as demonstrated by applying it organic solar cells, keeping its high-performance unaltered.

A droplet deposited or impacting on a superhydrophobic surface rolls off easily, leaving the dry and clean. This remarkable property is due to structure that favors entrainment of air cushions beneath drop, leading so-called Cassie state. The state competes with Wenzel (impaled) state, in which liquid fully wets substrate. To use superhydrophobicity, impalement drop into needs be prevented. understand underlying processes, we image dynamics three dimensions by confocal microscopy. While...

For a liquid droplet to slide down solid planar surface, the surface usually has be tilted above critical angle of approximately 10°. By contrast, droplets nearly any "slip" on lubricant-infused textured surfaces - so termed slippery when by only few degrees. The mechanism how lubricant alters static and dynamic properties drop remains elusive because drop-lubricant interface is hidden. Here, we image shape drops laser scanning confocal microscopy. contact with substrate exceeds 140°,...

We monitor the self-cleaning process on a single-particle level and quantify involved forces.

Superliquid repellency can be achieved by nano- and microstructuring surfaces in such a way that protrusions entrap air underneath the liquid. It is still not known how three-phase contact line advances on structured surfaces. In contrast to smooth surface, where advance continuously, superliquid-repellent has overcome an gap between protrusions. Here, we apply laser scanning confocal microscopy get first microscopic videos of water drops advancing superhydrophobic array micropillars. common...

Polydimethylsiloxane (PDMS) can be grafted to metal-oxide photocatalysts such as titanium oxide by simple UV irradiation in solution or melt. The PDMS graft metal oxides are still photocatalytically active. They hydrophobic, liquid repellent, self-cleaning, prevent biofouling and long-term stable even light.

A versatile and facile synthetic route toward a ultralight hierarchical poroushybrid composed of metal-organic gels fluorinated graphene oxide is reported. The composite show excellent absorbency oil various organic solvents due to their prominent meso/macropores, notable hydrophobicity, superoleophilicity. As service our authors readers, this journal provides supporting information supplied by the authors. Such materials are peer reviewed may be re-organized for online delivery, but not...

Interfaces between water and silicates are ubiquitous relevant for, among others, geochemistry, atmospheric chemistry, chromatography. The molecular-level details of organization at silica surfaces important for a fundamental understanding this interface. While is hydrophilic, weakly hydrogen-bonded OH groups have been identified the surface silica, characterized by high O-H stretch vibrational frequency. Here, through combination experimental theoretical surface-selective spectroscopy, we...

To predict the properties of superamphiphobic layers we analyzed wetting a square and hexagonal array vertical pillars composed spheres (radius R) partially sintered together. Apparent contact angles above 150° are obtained by pinning non-polar liquid surface at underside top sphere resulting in Fakir or Cassie state. Analytical equations derived for impalement pressure limiting case A0 ≫ R2, where is area regular unit cell containing single pillar. The close investigated numerically. By...

Core-shell polystyrene-silica spheres with diameters of 800 nm and 1.9 microm were synthesized by soap-free emulsion dispersion polymerization the polystyrene core, respectively. The used as templates for synthesis silica shells tunable thickness employing Stöber method [Graf et al. Langmuir 2003, 19, 6693]. template was removed thermal decomposition at 500 degrees C, resulting in smooth well-defined (15-70 nm). elastic response these hollow probed atomic force microscopy (AFM). A point load...

Losing contact: Omniphobic surfaces can be readily produced by acid-catalyzed graft polycondensation of dimethyldimethoxysilane (PDMS). Droplets show a very small contact angle hysteresis as well low sliding only few degrees. The nm-thick PDMS layer is neither easily washed away nor depleted. This method offers novel approach towards the preparation super-liquid-repelling surfaces.

We measured the forces required to slide sessile drops over surfaces. The were by means of a vertical deflectable capillary stuck in drop. drop adhesion force instrument (DAFI) allowed investigation dynamic lateral water 0.1 2 μL volume at defined velocities. On flat PDMS surfaces, increases linearly with diameter contact area solid–liquid interface and sliding velocity. movement relative surfaces enabled us resolve pinning three-phase line individual defects. further investigated 3D...

Abstract Low roll‐off angle, high impalement pressure, and mechanical robustness are key requirements for super‐liquid‐repellent surfaces to realize their potential in applications ranging from gas exchange membranes protective self‐cleaning materials. Achieving these properties is still a challenge with superamphiphobic surfaces, which can repel both water low‐surface‐tension liquids. In addition, fabrication procedures of typically slow expensive. Here, by making use liquid flame spray,...

The dynamics of liquid drops impacting superamphiphobic coatings is studied by high-speed video microscopy. Superamphiphobic repel water and oils. coating consists a fractal-like hydrophobized silica network. Mixtures ethanol-water glycerin-water are chosen to investigate the influence interfacial tension viscosity on spreading retraction dynamics. Drop dominated inertia. At low impact velocity, completely rebound. However, contact time increases with whereas restitution coefficient...

A method for mesoporous supraparticle synthesis on superamphiphobic surfaces is designed. Therefore, supraparticles assembled with nanoparticles are synthesized by the evaporation of nanoparticle dispersion drops surface. For synthesis, no further purification required and organic solvents wasted. Moreover, changing conditions such as drop size concentration, different sizes, compositions, architectures fabricated. As a service to our authors readers, this journal provides supporting...

Silicones are usually considered to be inert and, thus, not reactive with surfaces. Here we show that the most common silicone, methyl-terminated polydimethylsiloxane, spontaneously and stably bonds on glass-and any other material silicon oxide surface chemistry-even at room temperature. As a result, 2-5 nm thick transparent coating, which shows extraordinary nonstick properties toward polar nonpolar liquids, ice, even super glue, is formed. Ten microliter drops of various liquids slide off...

In a gas membrane, is transferred between liquid and through microporous membrane. The main challenge to achieve high transfer while preventing wetting clogging. With respect the oxygenation of blood, haemocompatibility also required. Here we coat macroporous meshes with superamphiphobic—or repellent—layer meet this challenge. superamphiphobic layer consists fractal-like network fluorinated silicon oxide nanospheres; trapped nanospheres keeps from contacting wall We demonstrate capabilities...

Biofilm formation is most commonly combatted with antibiotics or biocides. However, proven toxicity and increasing resistance of bacteria increase the need for alternative strategies to prevent adhesion surfaces. Chemical modification surfaces by tethering functional polymer brushes films provides a route toward antifouling coatings. Furthermore, nanorough superhydrophobic can delay biofilm formation. Here we show that submicrometer-sized roughness outweigh surface chemistry testing E. coli...

While the global slippage of water past superhydrophobic surfaces has attracted wide interest, local distribution slip still remains unclear. Using fluorescence correlation spectroscopy, we performed detailed measurements flow field and length for in Cassie state on a microstructured surface. We revealed that is finite, nonconstant, anisotropic, sensitive to presence surfactants. In combination with numerical calculations flow, can explain all these properties by hydrodynamics.