Omniphobic Slippery Coatings Based on Lubricant-Infused Porous Polyelectrolyte Multilayers

Huang, Xiangru; Chrisman, James D.; Zacharia, Nicole S.

doi:10.1021/mz400387w

Cited by 108 publications

(111 citation statements)

References 26 publications

(57 reference statements)

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“…3(f)) and this porous structure then facilitates the retention of the lubricating oil on the surface. The droplet has a low surface friction when moving on the oil infused surface and it therefore slides easily [36,39,42,43]. Moreover, the SLIP surface provides a sufficiently large footprint The SAW microfluidics performance of a 2 µL DI water on the SLIP surfaces treated with different numbers of coated layers and silicone oil layer thickness was investigated.…”

Section: Resultsmentioning

confidence: 99%

Slippery Liquid-Infused Porous Surfaces and Droplet Transportation by Surface Acoustic Waves

et al. 2017

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Section: Resultsmentioning

confidence: 99%

Slippery Liquid-Infused Porous Surfaces and Droplet Transportation by Surface Acoustic Waves

et al. 2017

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“…Also, both liquids must be immiscible. The properties of such coatings are not sensitive to the precise micro/nanostructures of the surface, making the preparation technique cost-effective, for example for the Teflon membrane (shown in Figure 20c) and the porous polyelectrolyte multilayers [73]. Additionally, surfaces with functionalized ordered microstructures such as microposts could also be used as a substrate to prepare SLIPS.…”

Section: Slippery Liquid-infused Porous Surfaces (Slips)mentioning

confidence: 99%

Polymeric Slippery Coatings: Nature and Applications

Samaha

Gad‐el‐Hak

2014

Polymers

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Abstract:We review recent developments in nature-inspired superhydrophobic and omniphobic surfaces. Water droplets beading on a surface at significantly high static contact angles and low contact-angle hystereses characterize superhydrophobicity. Microscopically, rough hydrophobic surfaces could entrap air in their pores resulting in a portion of a submerged surface with air-water interface, which is responsible for the slip effect. Suberhydrophobicity enhances the mobility of droplets on lotus leaves for self-cleaning purposes, so-called lotus effect. Amongst other applications, superhydrophobicity could be used to design slippery surfaces with minimal skin-friction drag for energy conservation. Another kind of slippery coatings is the recently invented slippery liquid-infused porous surfaces (SLIPS), which are one type of omniphobic surfaces. Certain plants such as the carnivorous Nepenthes pitcher inspired SLIPS. Their interior surfaces have microstructural roughness, which can lock in place an infused lubricating liquid. The lubricant is then utilized as a repellent surface for other liquids such as water, blood, crude oil, and alcohol. In this review, we discuss the concepts of both lotus effect and Nepenthes slippery mechanism. We then present a review of recent advances in manufacturing polymeric and non-polymeric slippery surfaces with ordered and disordered micro/nanostructures. Furthermore, we discuss the performance and longevity of such surfaces. Techniques used to characterize the surfaces are also detailed. We conclude the article with an overview of the latest advances in characterizing and using slippery surfaces for different applications.

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“…These exhibit excellent non-wetting 5 performances and provide an alternative to traditional superhydrophobic surfaces 26,27,28,29,30 .…”

Section: Introductionmentioning

confidence: 99%

“…These surfaces show low sliding angles 26,27,28,29,30 , self-healing properties through capillary wicking upon damage 28 , have anti-icing abilities 31 and are capable of withstanding external pressure 28 . Several thermodynamically stable states can exist when a droplet is placed on a SLIPS surface depending on the spreading coefficient of the lubricating liquid and the test liquid as well as the surface texture 26 .…”

Section: Introductionmentioning

confidence: 99%

Evaporation of Sessile Droplets on Slippery Liquid-Infused Porous Surfaces (SLIPS)

et al. 2015

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Over the past decade, the most common approach to creating liquid shedding surfaces has been to amplify the effects of nonwetting surface chemistry, using micro/ nanotexturing to create superhydrophobic and superoleophobic surfaces. Recently, an alternative approach using impregnation of micro/nanotextured surfaces with immiscible lubricating liquids to create slippery liquid-infused porous surfaces (SLIPS) has been developed. These types of surfaces open up new opportunities to study the mechanism of evaporation of sessile droplets in zero contact angle hysteresis situations where the contact line is completely mobile. In this study, we fabricated surfaces consisting of square pillars (10−90 μm) of SU-8 photoresist arranged in square lattice patterns with the center-to-center separation between pillars of 100 μm, on which a hydrophobic coating was deposited and the textures impregnated by a lubricating silicone oil. These surfaces showed generally low sliding angles of 1°or less for small droplets of water. Droplet profiles were more complicated than on nonimpregnated surfaces and displayed a spherical cap shape modified by a wetting ridge close to the contact line due to balancing the interfacial forces at the line of contact between the droplet, the lubricant liquid and air (represented by a Neumann triangle). The wetting ridge leads to the concept of a wetting "skirt" of lubricant around the base of the droplet. For the SLIP surfaces, we found that the evaporation of small sessile droplets (∼2 mm in diameter) followed an ideal constant contact angle mode where the apparent contact angle was defined from the intersection of the substrate profile with the droplet spherical cap profile. A theoretical model based on diffusion controlled evaporation was able to predict a linear dependence in time for the square of the apparent contact radius. The experimental data was in excellent quantitative agreement with the theory and enabled estimates of the diffusion constant to be obtained.

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Omniphobic Slippery Coatings Based on Lubricant-Infused Porous Polyelectrolyte Multilayers

Cited by 108 publications

References 26 publications

Slippery Liquid-Infused Porous Surfaces and Droplet Transportation by Surface Acoustic Waves

Slippery Liquid-Infused Porous Surfaces and Droplet Transportation by Surface Acoustic Waves

Polymeric Slippery Coatings: Nature and Applications

Evaporation of Sessile Droplets on Slippery Liquid-Infused Porous Surfaces (SLIPS)

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