Physics and applications of superhydrophobic and superhydrophilic surfaces and coatings

Drelich, Jaroslaw; Marmur, Abraham

doi:10.1680/si.13.00017

Cited by 156 publications

(104 citation statements)

References 127 publications

(143 reference statements)

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“…[1][2][3] In addition, many engineering inventions rely on liquid-solid interactions, including inkjet printing, 4 biosurfactant transport in agricultural soil, 5 froth flotation of particles 6,7 and many other applications. [8][9][10][11] By grasping the mechanism that governs liquid-solid interactions, solid surfaces can be designed and fabricated to meet demands in industrial applications, such as slippery superhydrophobic surfaces for self-cleaning, 12,13 anti-icing, [14][15][16] drag reduction 13 and enhanced condensation, 17 sticky superhydrophobic surfaces for liquid capturing, [18][19][20] superhydrophobic fabric for water and dirt resistance, 21 superhydrophilic surfaces for boiling 22 and water collection 23 and other surfaces. 24 Adhesion force measurement is an effective way to quantify the interactions between liquid and solid surfaces.…”

Section: Introductionmentioning

confidence: 99%

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Direct Measurements of Adhesion Forces for Water Droplets in Contact with Smooth and Patterned Polymers

SunYujin

Jiang

ChoiChang-Hwan

et al. 2017

Surface Innovations

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A microelectronic balance system was employed to measure the force of spreading (snap-in force) during water droplet attachment and spreading on polymer surfaces and the water-polymer adhesion forces (maximum adhesion and pulloff forces) after droplet compression, retreat and detachment. Equipped with a charge-coupled device camera and data acquisition software, the instrument measured directly the forces; monitored droplet-surface separation, including distances over which droplet stretched; and collected optical images simultaneously. The images were used to analyze capillary and surface tension forces based on measured droplet shape, surface curvature, droplet base radius and values of contact angles. The forces measured with the microbalance were compared to calculated capillary/surface tension forces. Nearly excellent agreement between directly measured and calculated forces was verified for polymers with smooth surfaces. Experiments with patterned polymers with pores and pillars revealed that interpretation of forces requires knowledge of a triple-contact-line characteristic. One relevant parameter, named normalized contact line length, was introduced to surface tension forces to quantify forces measured directly with a microbalance.

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Section: Introductionmentioning

confidence: 99%

“…8,9,[37][38][39] Li et al 40 studied the correlation between water adhesion to patterned surfaces made of micropillars and micropores and receding contact angles. They directly observed the dynamics of the receding contact line and analyzed local contact angles on single micropillars.…”

mentioning

confidence: 99%

Direct Measurements of Adhesion Forces for Water Droplets in Contact with Smooth and Patterned Polymers

SunYujin

Jiang

ChoiChang-Hwan

et al. 2017

Surface Innovations

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“…[137] For example, by creating a SHPL coating consisting of TiO 2 and SiO 2 , a general and cost-effective strategy was developed for electrostatic powder coating on insulating substrates. Water droplets can spread completely and join together to form continuous ultra-thin water film that is temporarily conductive, thus electrostatic powder coatings can be successfully operated.…”

Section: Broad Applications Of Slpl Interfaces In Scientific Researchmentioning

confidence: 99%

Superlyophilic Interfaces and Their Applications

et al. 2017

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Superlyophilic interfaces denote interfaces displaying strong affinity to diverse liquids, including superhydrophilic, superoleophilic, and superamphiphilic interfaces. When coming in contact with these interfaces, water or oil droplets tend to spread completely with contact angles close to 0°, presenting versatile applications including self‐cleaning, antifogging, controllable liquid transport, liquid separation, and so forth. Inspired by nature, scientists have developed various kinds of artificial superlyophilic (SLPL) interfaces in the past decades. In terms of dimensional characteristics, the artificial SLPL interfaces can be divided into four categories: i) 0D particles, whose dispersibility or catalytic performance can be notably enhanced by superlyophilicity; ii) 1D micro‐/nanofibers or nanotubes/channels, which can efficiently transfer liquids with SLPL interfaces; iii) 2D flat SLPL interfaces, on which different functional molecules can be deposited uniformly, forming ultrathin and smooth films; and iv) 3D structures, which can be obtained by either constructing 0D, 1D, or 2D SLPL materials separately or directly fabricating random SLPL frameworks, and can always be used as functional coatings or bulk materials. Here, natural and artificial SLPL interfaces are briefly introduced, followed by a short discussion of the limit between lyophilicity and lyophobicity, and then a snapshot of methods to generate SLPL interfaces is given. Specific focus is placed on recent achievements of constructing SLPL interfaces from zero to three dimensions. Following that, broad applications of SLPL interfaces in commercial areas will be introduced. Finally, a short summary and outlook for future challenges in this field is presented.

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“…Such effect is named superhydrophobicity, wherein the surface water (advancing) contact angle (CA) is larger than 150°and the sliding angle (SA) is smaller than 10°. 3,4 A rough surface microstructure and a low surface energy composition, [3][4][5][6] on the whole, are indispensable for the creation of superhydrophobicity. Until now, general means for fabrication of superhydrophobic surface include sol-gel processing, 7,8 anodic oxidation, 9,10 spray deposition, 11 chemical etching, [12][13][14][15][16] electrospinning 17,18 and so on.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of superhydrophobic zirconium surface with a facile electrodeposition process

ChenChunlin¹,

Heyi²,

Fanyi³

et al. 2017

Surface Innovations

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A superhydrophobic zirconium film with a hierarchical knobbly structure was prepared by a one-step electrochemical method on the surface of steel. Wettability was determined with a water contact angle of 157°and a sliding angle of 3°. The morphology was characterized with scanning electron microscopy, and the microstructure seemed like it is composed of micro-nano complicated particles. Furthermore, according to the results of Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy and energy-dispersive X-ray spectrometry, the chemical composition of the film was zirconium palmitate. Moreover, the chemical and mechanical stabilities of the asprepared superhydrophobic zirconium palmitate surface were characterized by means of electrochemical measurements and abrasion test, respectively. The superhydrophobic surface could yield a stable air-liquid interface by performing as a barrier, from which the diffusion of corrosive media was prevented. On the other hand, the asprepared surface exhibited a good self-cleaning effect, by which the accumulation of contaminants on the surface was not favorable. NotationE corr corrosion potential I corr corrosion current density R ct charge transfer resistance S-Zr steel-zirconium palmitate

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Physics and applications of superhydrophobic and superhydrophilic surfaces and coatings

Cited by 156 publications

References 127 publications

Direct Measurements of Adhesion Forces for Water Droplets in Contact with Smooth and Patterned Polymers

Direct Measurements of Adhesion Forces for Water Droplets in Contact with Smooth and Patterned Polymers

Superlyophilic Interfaces and Their Applications

Fabrication of superhydrophobic zirconium surface with a facile electrodeposition process

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