Anisotropic wettability of laser micro-grooved SiC surfaces

Ma, Chao; Bai, Shaoxian; Peng, Xudong; Meng, Yonggang

doi:10.1016/j.apsusc.2013.08.055

Cited by 58 publications

(24 citation statements)

References 22 publications

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“…Numerical model was calibrated using experimental published data [4]. Good agreement was found between the experimental data and our lattice Boltzmann simulation (Fig.…”

Section: Numerical Simulations By Lattice Boltzmann Methodsmentioning

confidence: 70%

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Anisotropic Wetting of Hydrophobic and Hydrophilic Surfaces–Modelling by Lattice Boltzmann Method

Kubiak¹,

Mathia²

2014

Procedia Engineering

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Anisotropic wetting on unidirectionally textured surfaces was investigated by Lattice Boltzmann Method. Previously published experimental data were used to validate the numerical model. New analysis were carried out by changing static contact angle of grooved surfaces from hydrophilic to hydrophobic (θ s = 50 − 150 • ). Presented results suggests that anisotropic wetting on unidirectionally textured surfaces is governed by spreading along the grooves by capillary action and mainly is dominant in Wenzel state on hydrophilic surfaces. Transition to Cassie-Baxter state on hydrophobic surfaces (θ s > 90 • ) significantly reduces the effect of anisotropic wetting. Structured texture and/or chemical heterogeneity can be potentially used to manipulate droplets in case of hydrophobic surfaces.

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“…Numerical model was calibrated using experimental published data [4]. Good agreement was found between the experimental data and our lattice Boltzmann simulation (Fig.…”

Section: Numerical Simulations By Lattice Boltzmann Methodsmentioning

confidence: 70%

“…However, on anisotropic surfaces where properties of surface will change in different directions [2,3], the wettability of surface is often anisotropic. Apparent contact angle is usually smaller in direction perpendicular to surface anisotropy (θ ⊥ ) and larger in parallel direction (θ ) as presented by Ma et al in [4].…”

Section: Introductionmentioning

confidence: 76%

Anisotropic Wetting of Hydrophobic and Hydrophilic Surfaces–Modelling by Lattice Boltzmann Method

Kubiak¹,

Mathia²

2014

Procedia Engineering

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“…Surface morphology plays an important role in solid surface wettability, which has wide applications in engineering practices, such as mechanical seals [1][2][3][4]. Protuberant morphology and concave morphology are two typical textures, which are represented by circle-dimpled and micro-squareconvex morphology, respectively.…”

Section: Introductionmentioning

confidence: 99%

Influence of laser geometric morphology type on SiC surface wettability

Wang

Bai

2015

Sci. China Technol. Sci.

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To obtain effective surface morphology to control surface wettability, this work investigated the influence of protuberant and concave morphology, which are respectively represented by circle-dimpled and micro-square-convex morphology, on surface wettability. The geometric morphologies were processed on silicon carbide (SiC) surfaces by a laser-marking machine, and surface wettability was monitored by the measurement of contact angles using the sessile drop method. Correlation analysis between contact angles and morphology parameters was conducted to determine the extent of influence. The results showed that the circle-dimpled diameter had a significant influence on surface wettability, whereas grooved width did not. Additionally, the depth of dimples and grooves exerted less influence on controlling wetting behaviors. In addition, surface wettability transformed from a superhydrophilic state to a hydrophobic state on micro-square-convex surfaces; contact angles on circle-dimpled surfaces showed a relatively slow transformation, though the surface wettability also underwent the state change.circle-dimpled morphology, micro-square-convex morphology, wettability, SiC Citation:Wang R, Bai S X. Influence of laser geometric morphology type on SiC surface wettability.

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“…Tailoring a surface with parallel structures can be an example, it has been shown [7][8][9][10][11][12] that a drop spreads preferably along the grooves, resulting in an elongated shape with a large difference in terms of contact angle, depending on the direction of the drop observation. The most commonly used models of wetting on rough and nonhomogeneous surfaces, Wenzel's [13] and Cassie-Baxter's models [14], cannot predict directly the variations of contact angle when the surface is anisotropic [5,11], especially when the size of the drop has the same order as the size of the texture [10]. The sharp grooves obtained by Hans et al [5] on copper alloys makes the contact angle vary along the drop contact line, with a difference up to 25% (from 75° to 95° approximately) for parallel and perpendicular direction of observation respectively.…”

Section: Introductionmentioning

confidence: 99%

Wetting of anisotropic sinusoidal surfaces—experimental and numerical study of directional spreading

Fischer¹,

Bigerelle²,

Kubiak³

et al. 2014

Surf. Topogr.: Metrol. Prop.

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Directional wettability, i.e. variation of wetting properties depending on the surface orientation, can be achieved by anisotropic surface texturing. A new high precision process can produce homogeneous sinusoidal surfaces (in particular parallel grooves) at the microscale, with a nano-scale residual roughness five orders of magnitude smaller than the texture features. Static wetting experiments have shown that this pattern, even with a very small aspect ratio, can induce a strong variation of contact angle depending on the direction of observation. A comparison with numerical simulations (using Surface Evolver software) shows good agreement and could be used to predict the fluid-solid interaction and droplet behaviour on textured surfaces. Two primary mechanisms of directional spreading of water droplets on textured stainless steel surface have been identified. The first one is the mechanical barrier created by the textured surface peaks, this limits spreading in perpendicular direction to the surface anisotropy. The second one is the capillary action inside the sinusoidal grooves accelerating spreading along the grooves. Spreading has been shown to depend strongly on the history of wetting and internal drop dynamics.

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Anisotropic wettability of laser micro-grooved SiC surfaces

Cited by 58 publications

References 22 publications

Anisotropic Wetting of Hydrophobic and Hydrophilic Surfaces–Modelling by Lattice Boltzmann Method

Anisotropic Wetting of Hydrophobic and Hydrophilic Surfaces–Modelling by Lattice Boltzmann Method

Influence of laser geometric morphology type on SiC surface wettability

Wetting of anisotropic sinusoidal surfaces—experimental and numerical study of directional spreading

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