Control of water droplet motion by alteration of roughness gradient on silicon wafer by laser surface treatment

Sun, Cheng; Zhao, Xiangwei; Han, Yonghao; Gu, Zhongze

doi:10.1016/j.tsf.2008.01.011

Cited by 111 publications

(99 citation statements)

References 21 publications

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“…In terms of wetting, the roughness and solid surface fraction properties are not one's of the surface itself, but of the surface sampled locally by the contact line of the liquid. This variation in pattern with position can be used to produce a pattern of surface wettability with variation of the local contact angle from one side of a droplet to the other and so create a driving force to direct the motion of a droplet [11,27,28,29]. Whether motion occurs depends on droplet size and the contact angle hysteresis.…”

Section: Important Considerations When Using Wenzel and Cassie-baxtermentioning

confidence: 99%

An introduction to superhydrophobicity

Shirtcliffe

McHale

Atherton

et al. 2010

Advances in Colloid and Interface Science

554

373

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Section: Important Considerations When Using Wenzel and Cassie-baxtermentioning

confidence: 99%

An introduction to superhydrophobicity

Shirtcliffe

McHale

Atherton

et al. 2010

Advances in Colloid and Interface Science

554

373

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“…They indicated that by controlling this structure, it is possible to control the hydrophobicity [74].…”

Section: Anodizing and Some Other Techniquesmentioning

confidence: 99%

Protection of metal and alloy surfaces using corrosion resistance nanostructured superhydrophobic coatings /

Huang¹

2012

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Dans notre travail actuel, le processus de fabrication de surfaces de cuivre superhydrophobe est simplifié en une simple étape. L'application d'une tension continue entre deux plaques de cuivre immergé dans une solution diluée d'acide stéarique éthanolique transforme la surface de l'électrode de cuivre anodique en superhydrophobe due à la formation de micronano fibres de stéarate de cuivre à faible énergie de surface, tel que confirmé par rayons X diffraction (XRD) et microscopie électronique à balayage (MEB). L'augmentation du potentiel de modification, ainsi que la temps de modification conduit à l'augmentation de la valeur de la faible énergie de surface des micronanostructures ainsi que l'augmentation de la superhydrophobicité des surfaces telle que mesurée par l'angle de contact de l'eau. ABSTRACTSuperhydrophobic surfaces, which demonstrate high water-repellency, have recently become a very popular field because of its scientific and technological importance and wide range of applications in diverse areas. Preparation of nanostructured superhydrophobic surfaces requires both an optimum roughness and low surface energy; therefore, superhydrophobic surfaces are conventionally prepared employing two steps: roughening a surface and lowering its surface energy.In our present work, the fabrication process of superhydrophobic copper surfaces is simplified as just one-step. The application of a direct voltage between two copper plates immersed in a dilute ethanolic stearic acid solution transforms the surface of the anodic copper electrode to superhydrophobic due to the formation of micro-nanofibors low surface energy follower-like copper stéarate as confirmed by X-ray diffraction (XRD) and scanning electron microscope (SEM), respectively. The increase of the modification potential as well as the modification time leads to the increase of the amount of the low surface energy micro-nanostructures as well as the increase of the superhydrophobicity of the surfaces as measured by water contact angle.The nanostructured superhydrophobic aluminum alloy surfaces have also been prepared by the similar procedure as it was performed on copper surfaces. However, stearic acid modified aluminum alloy surfaces didn't show the superhydrophobic properties. Therefore, the aluminum surfaces were firstly coated with copper films followed by electrochemical modification with stearic acid solution. The copper grows as microdots on AA6061 Al alloy surfaces. The surface densities of the microdots increase with the increase of the negative deposition potentials. On the other hand their sizes as well as the distances between the microdots reduce with the increase of the negative deposition potentials. The surface roughness and water contact angle of electrodeposited copper film followed by electrochemical modification in ethanolic stearic acid solution increase with the increase in negative copper deposition potentials. The stearic acid modified copper films deposited at -0.6 V provides a surface roughness of 6.2 /un with a water contact a...

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“…The concept of directional fluid transport, which is also called "one-way liquid transport" or "fluid diode" is a phenomenon widely found in daily life. Examples can be found in one-dimensional (1D) materials, such as spider silk and its inspired designs for water-harvesting [9][10][11][12][13][14][15][16][17], two-dimensional (2D) solid surfaces which are fabricated typically by forming a chemical gradient [18][19][20][21][22][23], or chemically homogeneous but surface roughness variation [24][25][26][27][28] using various approaches, and three-dimensional (3D) porous materials such as textile fabrics [1,[5][6][7][29][30][31][32][33], cellulosic paper substrate [34], and electrospun nanofibrous membranes [3,7]. The 3D porous materials with directional water transport property are prepared either by forming a hydrophobicity-to-hydrophilicity gradient or two zones with opposite wettability across thickness.…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer in Directional Water Transport Fabrics

Zeng

Wang

Zhou

et al. 2016

Fibers

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Directional water transport fabrics can proactively transfer moisture from the body. They show great potential in making sportswear and summer clothing. While moisture transfer has been previously reported, heat transfer in directional water transport fabrics has been little reported in research literature. In this study, a directional water transport fabric was prepared using an electrospraying technique and its heat transfer properties under dry and wet states were evaluated, and compared with untreated control fabric and the one pre-treated with NaOH. All the fabric samples showed similar heat transfer features in the dry state, and the equilibrium temperature in the dry state was higher than for the wet state. Wetting considerably enhanced the thermal conductivity of the fabrics. Our studies indicate that directional water transport treatment assists in moving water toward one side of the fabric, but has little effect on thermal transfer performance. This study may be useful for development of "smart" textiles for various applications.

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Control of water droplet motion by alteration of roughness gradient on silicon wafer by laser surface treatment

Cited by 111 publications

References 21 publications

An introduction to superhydrophobicity

An introduction to superhydrophobicity

Protection of metal and alloy surfaces using corrosion resistance nanostructured superhydrophobic coatings /

Heat Transfer in Directional Water Transport Fabrics

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