Cassie−Wenzel Wetting Transition in Vibrating Drops Deposited on Rough Surfaces:  Is the Dynamic Cassie−Wenzel Wetting Transition a 2D or 1D Affair?

Bormashenko, Edward; Pogreb, Roman; Whyman, Gene; Erlich, Mordehai

doi:10.1021/la700935x

Cited by 263 publications

(214 citation statements)

References 32 publications

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“…This phenomenon has been previously observed for CassieWenzel wetting transition induced by pressure www.afm-journal.de or vibration force. [21,22] We also noted that NW connectors are completely wettable to IPA, octane, and mineral oil without any external pressure. The NW connectors showed underwater shear adhesion strength of $23 N cm À2 , $77% of the dry adhesion strength.…”

Section: Resultsmentioning

confidence: 71%

Wet and Dry Adhesion Properties of Self‐Selective Nanowire Connectors

Zhang

Chueh

et al. 2009

Adv Funct Materials

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Here, the wet and dry adhesion properties of hybrid Ge/parylene nanowire (NW) connectors are examined. The ability of the NW connectors to bind strongly even under lubricating conditions, such as mineral oil, sheds light on the dominant role of van der Waals interactions in the observed adhesion. The superhydrophobic surface of the NW connectors enables the wet, self‐cleaning of contaminant particles from the surface, similar to the lotus effect. In addition, the effect of NW length on the shear adhesion strength, repeated usability, and robustness of the connectors, all critical properties for applications that require reversible binding of components, is examined.

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Section: Resultsmentioning

confidence: 71%

Wet and Dry Adhesion Properties of Self‐Selective Nanowire Connectors

Zhang

Chueh

et al. 2009

Adv Funct Materials

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“…Young, Wenzel, and Cassie models for hydrophobicity of solid surfaces with and without roughness evaporation [25], condensation [26,27] and vibration [28]. Th is transition is accompanied by a decrease in the contact angle or an increase in contact angle hysteresis [24,26].…”

Section: Superhydrophobic Surfacesmentioning

confidence: 99%

Design of hydrophobic surfaces for liquid droplet control

Nakajima

2011

NPG Asia Mater

141

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During rainfall, small water droplets can be observed to roll off hydrophobic umbrella surfaces at diff erent speeds. A droplet on a round hydrophobic surface does not always slide down on the surface easily at a small tilt angle, but even if it does, large moving acceleration is not always observed. What determines the motion of droplets on solid surfaces?Diff erences in droplet shape on solid surfaces are often explained by variations in wettability. Th e wetting of a solid surface has persisted through the ages as a research subject at the border between physics and chemistry. Wettability control of a solid against a liquid has been widely explored in industry for application in daily life because it can engender various physical and chemical phenomena related to solids and liquids. Wettability is an important property of solid surfaces from both fundamental and practical aspects. Th e degree of adhesion of liquid droplets onto a solid surface is commonly described in terms of the contact angle (θ), which is given by Young's equation aswhere γ sv , γ sl , and γ lv represent the interfacial free energies per unit area of the solid-gas, solid-liquid and liquid-gas interfaces. Although the defi nition and measurement of the contact angle are simple and easy, the nature of wettability is complex because it is related to three phases: solid, liquid and gas. Moreover, various factors aff ect the surface wettability of a solid. When one factor of a solid surface such as roughness is altered, other factors such as the surface topography or its chemical composition often change simultaneously. Th erefore, it is usually diffi cult to discuss the results of surface wettability obtained from experiments while retaining academic rigor. Th e main research interest for industrial materials is the behavior of millimeter-size droplets on a solid surface of more than a few centimeters in area. Th erefore, the discussion of wettability among samples with great diff erences in surface character is sometimes conducted with ignorance of the infl uence of other characteristics.Hydrophobic coatings are extremely important for wettability control. Th e coatings are anticipated for various industrial uses such as anti-wetting, anti-snow (or ice), anti-rust and reduced friction resistance by reducing solid-liquid interaction. Generally, a hydrophobic surface is one on which water forms a round droplet that is easily removed. Recent advances in probe microscopy and surface spectroscopy and the wider availability of such techniques have revealed that macroscopic surface hydrophobicity, especially dynamic hydrophobicity, is aff ected by nanolevel characteristics such as structure, chemical composition and their alignment and homogeneity. Th e expected properties for a hydrophobic surface cannot always be obtained unless precise design and control of the solid surface are applied. Th is report presents the results of recent studies on the design of hydrophobic surfaces for droplet removal or control from the viewpoint of materials science....

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“…As a result, water enters into the space of the microstructure of the nanowires-structured mesh and fully "wet" this mesh. [42][43][44] A bubble that is released onto the mesh is repelled by the mesh at present, because the water filled in the microstructures prevents the bubble from effectively touching the mesh surface (Figure 4f). This is caused by the natural property that liquid generally repels gas.…”

Section: Resultsmentioning

confidence: 99%

Reversible switch between underwater superaerophilicity and superaerophobicity on the superhydrophobic nanowire-haired mesh for controlling underwater bubble wettability

et al. 2018

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Reversible switch between underwater superaerophilicity and superaerophobicity on the superhydrophobic nanowire-haired mesh for controlling underwater bubble wettability Controlling the underwater bubble wettability on a solid surface is of great research significance. In this letter, a simple method to achieve reversible switch between underwater superaerophilicity and underwater superaerophobicity on a superhydrophobic nanowire-haired mesh by alternately vacuumizing treatment in water and drying in air is reported. Such reversible switch endows the as-prepared mesh with many functional applications in controlling bubble's behavior on a solid substrate. The underwater superaerophilic mesh is able to absorb/capture bubbles in water, while the superaerophobic mesh has great anti-bubble ability. The reversible switch between underwater superaerophilicity and superaerophobicity can selectively allow bubbles to go through the resultant mesh; that is, bubbles can pass through the underwater superaerophilic mesh while are fully intercepted by the underwater superaerophobic mesh in a water medium. We believe these meshes will have important applications in removing or capturing underwater bubbles/gas. © 2018 Author (s)

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Cassie−Wenzel Wetting Transition in Vibrating Drops Deposited on Rough Surfaces: Is the Dynamic Cassie−Wenzel Wetting Transition a 2D or 1D Affair?

Cited by 263 publications

References 32 publications

Wet and Dry Adhesion Properties of Self‐Selective Nanowire Connectors

Wet and Dry Adhesion Properties of Self‐Selective Nanowire Connectors

Design of hydrophobic surfaces for liquid droplet control

Reversible switch between underwater superaerophilicity and superaerophobicity on the superhydrophobic nanowire-haired mesh for controlling underwater bubble wettability

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