Tuning wettability and getting superhydrophobic surface by controlling surface roughness with well-designed microstructures

Zhu, Liang; Feng, Yang; Ye, Xiongying; Zhou, Zhaoying

doi:10.1016/j.sna.2005.12.005

Cited by 137 publications

(111 citation statements)

References 11 publications

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“…The existence of a depinned state with static CAM can be determined by noticing the departure of an experimentally recorded APCA from the Cassie contact angle. In the process of investigating reported CAMs in literature, for surfaces with θY > 90°, Erbil et al conducted a detailed mathematical analysis of the deviation of APCA from that predicted by Wenzel and Cassie equations 5,43,44 . APCAs for 28 different surfaces (with known θY and square pillar geometry) were listed and, using the Cassie equation, converted to a solid fraction term.…”

Section: Surface Design For Quasi-static Robustness: Pressure Balancementioning

confidence: 99%

Design of a robust superhydrophobic surface: thermodynamic and kinetic analysis

Sarkar

Kietzig

2015

Soft Matter

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The design of a robust superhydrophobic surface is a widely pursued topic. While many investigations are limited to applications with high impact velocities (for raindrops of the order of a few m/s), the essence of robustness is yet to be analyzed for applications involving quasi-static liquid transfer. To achieve robustness with high impact velocities, the surface parameters (geometrical details, chemistry) have to be selected from a narrow range of permissible values, which often entail additional manufacturing costs. From the dual perspectives of thermodynamics and mechanics, we analyze the significance of robustness for quasi-static drop impact, and present the range of permissible surface characteristics. For surfaces with a Young's contact angle greater than 90° and square micropillar geometry, we show that robustness can be enforced when an intermediate wetting state (sagged state) impedes transition to a wetted state (Wenzel state). From the standpoint of mechanics, we use available scientific data to prove that a surface with any topology must withstand a pressure of 117 Pa to be robust. Finally, permissible values of surface characteristics are determined, which ensure robustness with thermodynamics (formation of sagged state) and mechanics (withstanding 117 Pa).

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Section: Surface Design For Quasi-static Robustness: Pressure Balancementioning

confidence: 99%

Design of a robust superhydrophobic surface: thermodynamic and kinetic analysis

Sarkar

Kietzig

2015

Soft Matter

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“…Of all these, the most commonly used is the lithography process which can be of two methods-photolithography, where layers are illuminated through a patterned mask to activate soft areas; and soft lithography, which is a simplified version of contact printing. Although relatively higher cost is involved in soft lithography it can produce a well-defined surface with excellent repeatability [74][75][76][77][78][79].…”

Section: Capillarity-directed Soft Lithography Technique To Mimic Surmentioning

confidence: 99%

Advances in Bio-inspired Tribology for Engineering Applications

Siddaiah

Menezes

2016

J Bio Tribo Corros

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Bio-inspired tribology is an interdisciplinary field of science where scientists and engineers seek to investigate and incorporate tribological properties encountered in biological beings into engineering applications. In this paper, bio-inspired tribological research that are speculated to have a huge impact on tribological applications have been reviewed. These research involve (1) investigations related to replication of lubricin found in synovial fluids of mammalian joints which have super-low friction values that can be utilized in IC engines, (2) surface replication concerning to superhydrophobic properties of gecko skin which is seen to have anti-wetting and selfcleaning properties, (3) friction-reducing shark skin through specialized nanoparticle coatings that is seen to give a different perspective on surface texturing, (4) new techniques, such as soft lithography to replicate surfaces of lotus leaf and air lubrication phenomenon inspired by emperor penguins that is being applied to propel boats, ships, and torpedoes faster by reducing skin friction underwater. Further, an investigation in self-healing materials inspired from pitcher plant that has led to the innovation of self-healing and slippery liquid-infused porous surfaces has been discussed. These research works reviewed not only provide a deep insight into the current advances in bio-inspired tribology but also helps understand the plausibility of the research applications in the future and the practicality of innovations possible.

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“…While, the wettability gradient surface, from hydrophobic to hydrophilic states or vice versa, can induce the transport of liquids, which a®ords a driving force for operation of micro-°uidic devices. [10][11][12][13][14][15][16][17][18][19] In particular, the spontaneous transport of water droplets has been attempted on wettability gradient surfaces with the aim of developing energy-free transportation systems. Therefore, researchers have developed various methods to generate wettability gradient surfaces, such as vapor-phase di®usion, [20][21][22][23] photodegradation, 13 gradual immersion 24,25 and microcontact printing.…”

Section: Introductionmentioning

confidence: 99%

Rapid Movement of Water Droplets on the Hydrophobic Surface of ZnO Nanorod Array Impregnated by Lubricant

Wang

Zhang

Guo

et al. 2015

NANO

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In this paper, it is described that the motion of water droplets on the hydrophobic surface of ZnO nanorod array impregnated lubricant, is called slippery liquid-infused porous surface (SLIPS). The energy gradient required to induce the motion of the droplets is created on the boundary of superhydrophobic ZnO nanorod array and SLIPS. Because of the lower viscous force of SLIPS, the water droplet can rapidly move for longer distance on the surface. In view of changing the release distance of water droplet, the mechanism for the rapid movement is discussed. The results indicate that the movement distance of water droplet markedly increases with the increasing of the release distance. Because the potential energy of the height is converted into kinetic energy, the water droplet intensively collides the interface between ZnO nanorod array and SLIPS. This impact makes the water droplet distort, which enhances the driving force. These new¯ndings will not only deepen our understanding of the relationship between surface structure and dynamic wetting properties, but also a®ord the new notion and bene¯cial reference for designing liquid droplet transportation devices in micro-°uidic systems.

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Tuning wettability and getting superhydrophobic surface by controlling surface roughness with well-designed microstructures

Cited by 137 publications

References 11 publications

Design of a robust superhydrophobic surface: thermodynamic and kinetic analysis

Design of a robust superhydrophobic surface: thermodynamic and kinetic analysis

Advances in Bio-inspired Tribology for Engineering Applications

Rapid Movement of Water Droplets on the Hydrophobic Surface of ZnO Nanorod Array Impregnated by Lubricant

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