Interfacial materials with special wettability

Wong, Tak Sing; Sun, Taolei; Feng, Lin; Aizenberg, Joanna

doi:10.1557/mrs.2013.99

Cited by 142 publications

(94 citation statements)

References 96 publications

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“…For such small volumes of liquid down to micro and nano litres, it is a challenge to efficiently manipulate and actuate droplets or liquid in microchannels due to the large surface area to volume ratio in microsystems and therefore the dominance of surface tension forces. This becomes particularly problematic with even modest levels of contact angle hysteresis, which results in contact line pinning [7,[22][23][24]. So far, various techniques have been employed to drive microscale fluids, including pressure gradients, capillary forces, electrical and magnetic fields, and SAWs [13,19,25].…”

Section: Acoustofluidicsmentioning

confidence: 99%

“…An alternative approach to facilitating droplet transportation is to focus on reducing the contact angle hysteresis [22]. In the absence of contact angle hysteresis, contact line pinning is removed and a droplet will be highly mobile irrespective of its equilibrium contact angle and droplet-solid surface contact area [33,34].…”

Section: 3slippery Liquid Infused Porous Surfaces (Slips)mentioning

confidence: 99%

“…In the present work, we propose a new method for SAW-induced droplet actuation, which is built on our understanding of SLIP surfaces [22,33,34,37,38]. In our case the infused liquid is chosen to be a lubricant oil and by designing the SLIP surface layer to be significantly thinner than the SAW wavelength, we ensure that little damping of the acoustic wave occurs by the lubricant in the SLIP layer.…”

Section: New Design Of Slips For Saw Microfluidicsmentioning

confidence: 99%

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

et al. 2017

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Section: Acoustofluidicsmentioning

confidence: 99%

Section: 3slippery Liquid Infused Porous Surfaces (Slips)mentioning

confidence: 99%

Section: New Design Of Slips For Saw Microfluidicsmentioning

confidence: 99%

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

et al. 2017

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“…Many natural systems have evolved into functional surfaces to achieve water transport for survival, [1][2][3][4][5][6][7][8][9][10] for example, the back of desert beetles, [1] shorebird beaks, [3] spider silk, [5] and cactus spines. [6] Without energy input, these biological surfaces can harness the movement of water through their unique structural features and chemical composition, [11][12][13] which gives inspiration for designing and fabricating functional surfaces and materials with wide applications in fields including antifogging and fog-collection, [14][15][16] microfluidic devices, [17][18][19][20][21] lubrication, [22,23] and liquid transport.…”

Section: Introductionmentioning

confidence: 99%

Surfaces Inspired by the Nepenthes Peristome for Unidirectional Liquid Transport

et al. 2017

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The slippery peristome of the pitcher plant Nepenthes has attracted much attention due to its unique function for preying on insects. Recent findings on the peristome surface of Nepenthes alata demonstrate a fast and continuous unidirectional liquid transport, which is enabled by the combination of a pinning effect at the sharp edges and a capillary rise in the wedge, deriving from the multiscale structure, which provides inspiration for designing and fabricating functional surfaces for unidirectional liquid transport. Developments in the fabrication methods of peristome‐inspired surfaces and control methods for liquid transport are summarized. Both potential applications in the fields of microfluidic devices, biomedicine, and mechanical engineering and directions for further research in the future are discussed.

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“…The difference between the Cassie and Wenzel states is that, the WCA in the Cassie state is greater than 150°and water droplets almost do not penetrate into the porous structure (low water adhesion), while water droplets in the Wenzel state penetrate into the porous structure (high water adhesion). 10,37 In this work, the wettability of the as-prepared aluminum surfaces is investigated. Figure 7 shows the change of the wettability of the aluminum surface treated at 90°C for 2 h with 6 mM of zinc ion concentration.…”

Section: Formation Of Zn-al Ldh Film On Aluminum Substratementioning

confidence: 99%

Facile fabrication of superhydrophobic surface with needle-like microflower structure on aluminum substrate

2015

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A superhydrophobic surface on aluminum substrate was fabricated by creating a needle-like microflower structure based on a simple hydrothermal synthesis process, and subsequently reducing the surface free energy via the self-assembly of lauric acid. The surface morphology, chemical compositions, and hydrophobicity of the as-prepared films on aluminum substrates were measured using a scanning electron microscope, X-ray powder diffraction, Fourier transform infrared spectroscopy, and water contact angle (WCA) measurements. The optimal hydrothermal synthesis conditions, such as reaction temperature, reaction time, and the concentration of zinc ion, were investigated. In addition, the formation mechanism of the microstructure on aluminum surface was also examined. The results showed the surface of aluminum substrate was endowed with a needle-like microflower structure when hydrothermal synthesis was conducted at 90°C for 2 h with 6 mM of zinc ion concentration. In addition, the as-prepared superhydrophobic aluminum surface has a WCA as high as 154.2°and a sliding angle close to 0°.

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Interfacial materials with special wettability

Abstract: Abstract

Cited by 142 publications

References 96 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

Surfaces Inspired by the Nepenthes Peristome for Unidirectional Liquid Transport

Facile fabrication of superhydrophobic surface with needle-like microflower structure on aluminum substrate

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