Spray-on omniphobic ZnO coatings

Neelakantan, Nitin K.; Weisensee, Patricia B.; Overcash, John W.; Torrealba, Eduardo J.; King, William P.; Suslick, Kenneth S.

doi:10.1039/c5ra11178a

Cited by 28 publications

(14 citation statements)

References 45 publications

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“…This agrees with the results of Neelakantan et al [ 32 ]. Therefore, the authors demonstrated that corrosion protection is related to the surface chemistry and topography of the coating surface.…”

Section: Silane-based Coatingssupporting

confidence: 94%

Mechanical Properties of Protective Coatings against Marine Fouling: A Review

2021

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The accumulation of marine organisms on ship hulls, such as microorganisms, barnacles, and seaweeds, represents a global problem for maritime industries, with both economic and environmental costs. The use of biocide-containing paints poses a serious threat to marine ecosystems, affecting both target and non-target organisms driving science and technology towards non-biocidal solutions based on physico-chemical and materials properties of coatings. The review reports recent development of hydrophobic protective coatings in terms of mechanical properties, correlated with the wet ability features. The attention is focused mainly on coatings based on siloxane and epoxy resin due to the wide application fields of such systems in the marine industry. Polyurethane and other systems have been considered as well. These coatings for anti-fouling applications needs to be both long-term mechanically stable, perfectly adherent with the metallic/composite substrate, and capable to detach/destroy the fouling organism. Prospects should focus on developing even “greener” antifouling coatings solutions. These coatings should also be readily addressable to industrial scale-up for large-scale product distribution, possibly at a reasonable cost.

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Section: Silane-based Coatingssupporting

confidence: 94%

Mechanical Properties of Protective Coatings against Marine Fouling: A Review

2021

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“…The presence of reducing gases leads to a decrease in the surface-bound oxygen concentration, and therefore in a decrease in the measured resistivity. There are also interesting solutions using ZnO-enhanced polymeric coatings, e.g., for protection from both water and oil-like liquids [177]. Finally, bridging to the nanostructure world, ZnO nanoparticles are made into coatings for bone implants to protect them from infection due to their antibacterial activity and biocompatibility [178].…”

Section: Thick Filmsmentioning

confidence: 99%

ZnO as a Functional Material, a Review

2019

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Zinc oxide (ZnO) is a fascinating wide band gap semiconductor material with many properties that make it widely studied in the material science, physics, chemistry, biochemistry, and solid-state electronics communities. Its transparency, possibility of bandgap engineering, the possibility to dope it into high electron concentrations, or with many transition or rare earth metals, as well as the many structures it can form, all explain the intensive interest and broad applications. This review aims to showcase ZnO as a very versatile material lending itself both to bottom-up and top-down fabrication, with a focus on the many devices it enables, based on epitaxial structures, thin films, thick films, and nanostructures, but also with a significant number of unresolved issues, such as the challenge of efficient p-type doping. The aim of this article is to provide a wide-ranging cross-section of the current state of ZnO structures and technologies, with the main development directions underlined, serving as an introduction, a reference, and an inspiration for future research.

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“…Figure d shows a schematic of wettability principles for the hierarchically structured SPO/SPI layers. During the sequential spray-coating process, re-entrant microstructures form from the aerosol of adhesive droplets and agglomerates of F-NPs . Thus, when a liquid with low surface tension is loaded onto the fabricated structures, the meniscus between the liquid and re-entrant cavities adopts a convex shape because of the negative slope of the re-entrant structures and the low surface energy of the F-NPs. , The gravitational force induced downward intrinsic pressure ( P i ) in equilibrium with an upward Laplace pressure ( P L ) at the interfaces.…”

Section: Resultsmentioning

confidence: 99%

Single-Droplet Multiplex Bioassay on a Robust and Stretchable Extreme Wetting Substrate through Vacuum-Based Droplet Manipulation

et al. 2018

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Herein, a droplet manipulation system with a superamphiphobic (SPO)-superamphiphilic (SPI) patterned polydimethylsiloxane (PDMS) substrate is developed for a multiplex bioassay from single-droplet samples. The SPO substrate is fabricated by sequential spraying of adhesive and fluorinated silica nanoparticles onto a PDMS substrate. It is subsequently subjected to oxygen plasma with a patterned mask to form SPI patterns. The SPO layer exhibits extreme liquid repellency with a high contact angle (>150°) toward low surface tension and viscous biofluidic droplets (e.g., ethylene glycol, blood, dimethyl sulfoxide, and alginate hydrogel). In contrast, the SPI exhibits liquid adhesion with a near zero contact angle. Using the droplet manipulation system, various liquid droplets can be precisely manipulated and dispensed onto the predefined SPI patterns on the SPO PDMS substrate. This system enables a multiplex colorimetric bioassay, capable of detecting multiple analytes, including glucose, uric acid, and lactate, from a single sample droplet. In addition, the detection of glucose concentrations in a plasma droplet of diabetic and healthy mice are performed to demonstrate the feasibility of the proposed system for efficient clinical diagnostic applications.

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Spray-on omniphobic ZnO coatings

Cited by 28 publications

References 45 publications

Mechanical Properties of Protective Coatings against Marine Fouling: A Review

Mechanical Properties of Protective Coatings against Marine Fouling: A Review

ZnO as a Functional Material, a Review

Single-Droplet Multiplex Bioassay on a Robust and Stretchable Extreme Wetting Substrate through Vacuum-Based Droplet Manipulation

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