Preparation and Characterization of Super-Hydrophobic Surfaces on Aluminum and Stainless Steel Substrates

Yu, Zhenjiang; Yu, Yuefei; Li, Yanfeng; Song, Shanpeng; Huo, Subin; Han, Xiaoying

doi:10.1142/s0218625x10014132

Cited by 20 publications

(8 citation statements)

References 16 publications

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“…The böhmite layer renders the surface superhydrophilic. Following the work of other researchers [64,65], the superhydrophilic samples were then immersed in a 1% (by weight) solution of 1H,1H,2H,2H-perfluorodecyltriethoxysilane (97%, Sigma-Aldrich, fluoro-alkyl silane (FAS)) in ethanol (200 proof, Decon Labs) for 8-10 h ( Fig. 1e), which created a monolayer of FAS on the roughened Al substrates, thus rendering them superhydrophobic (by reducing the surface energy of the exposed area of the sample).…”

Section: Methodsmentioning

confidence: 97%

Orthogonal liquid-jet impingement on wettability-patterned impermeable substrates

et al. 2019

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Liquid jet impingement on flat, impermeable substrates is important for a multitude of applications, ranging from electronic equipment cooling, to fuel atomization, and erosion of solid surfaces. On a wettable surface, where a sufficient downstream liquid depth can be sustained after axisymmetric impingement, the jet forms a thin film on the substrate up to a radial distance where the film height suddenly increases, forming a hydraulic jump. On a superhydrophobic surface, where a downstream liquid depth is not naturally sustained, the thin film expands and breaks up into droplets, which are subsequently ejected in a random fashion outward, as carried by their radial momentum. In the present work, a facile, scalable, wettability-patterning approach is presented for delaying or even eliminating droplet breakup in the case of jet impingement on horizontal superhydrophobic surfaces. An analytical expression for predicting the hydraulic jump and droplet breakup locations is developed to designate the proper wettability patterns that facilitate alteration and control of the post-impingement liquid behavior. The axisymmetric model is extended to evaluate the radial variation of the competing forces responsible for film breakup, and a design criterion for the effective wettability patterns is proposed.

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Section: Methodsmentioning

confidence: 97%

Orthogonal liquid-jet impingement on wettability-patterned impermeable substrates

et al. 2019

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“…The boiling step resulted in the formation of a thin layer of aluminum oxide hydroxide (Al(O)OH) or böhmite on the surface of the substrate, resulting in superhydrophilic behavior (water contact angle ∼0°). As done by previous researchers, , the superhydrophilic aluminum samples were then immersed in a 1% (by weight) solution of 1 H ,1 H ,2 H ,2 H -perfluorodecyltriethoxysilane [97%, Sigma-Aldrich, fluoro-alkyl silane(FAS)] in ethanol (200 proof, Decon Labs) for 8–10 h (Figure e). This step resulted in the deposition of a monolayer of FAS on the roughened Al substrates, thus imparting superhydrophobicity to the surface.…”

Section: Methodsmentioning

confidence: 99%

Scaling Laws in Directional Spreading of Droplets on Wettability-Confined Diverging Tracks

et al. 2018

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Spontaneous pumpless transport of droplets on wettability-confined tracks is important for various applications, such as rapid transport and mixing of fluid droplets, enhanced dropwise condensation, biomedical devices, and so forth. Recent studies have shown that on an open surface, a superhydrophilic track of diverging width, laid on a superhydrophobic background, facilitates the transport of water from the narrower end to the wider end at unprecedented rates (up to 40 cm/s) without external actuation. The spreading behavior on such surfaces, however, has only been characterized for water. Keeping in mind that such designs play a key role for a diverse range of applications, such as handling organic liquids and in point-of-care devices, the importance of characterizing the spreading behavior of viscous liquids on such surfaces cannot be overemphasized. In the present work, the spreading behavior on the aforementioned wettability-patterned diverging tracks was observed for fluids of different viscosities. Two dimensionless variables were identified, and a comprehensive relationship was obtained. Three distinct temporal regimes of droplet spreading were established: I), a Washburn-type slow spreading, II) a much faster Laplace pressure-driven spreading, and III), a sluggish density-augmented Tanner-type film spreading. The results offer design guidance for tracks that can pumplessly manage fluids of various viscosities and surface tensions.

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“…Figure indicates that as the reaction temperature increases, the contact angle of the core surface increases and remains nearly unchanged after 40 °C. This is because when the temperature is too low, the coupling agent does not have enough energy to hydrolyze and polymerize, and the adsorption on the rock surface is also hindered . Thus, the modifier cannot smoothly react with the coupling agent, resulting in the insufficient completion of the surface modification .…”

Section: Results and Discussionmentioning

confidence: 99%

Superhydrophobic Surface Fabrication for Strengthened Selective Water Shut-off Technology

Liu

Zhang

Liu³

et al. 2020

Energy Fuels

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A two-step solution immersion method was used to successfully fabricate a superhydrophobic film on the surface of the core, which can effectively separate oil and water. The optimal reagent concentration of the superhydrophobic surface was 1.0 wt % aminopropyl triethoxysilane + 0.7 wt % stearoyl chloride + 0.2 wt % triethylamine, suitable for reservoirs with a formation temperature around 40–100 °C, and the maximum contact angle of the prepared superhydrophobic surface was 155° with a sliding angle smaller than 3°. A scanning electron microscope and a contact angle measuring instrument were used to characterize the surface. Displacement experiments and oil–water separation experiments demonstrated that the superhydrophobic surface could significantly change the wettability of the formation and have a good selective water shut-off performance. The presented method is rapid and convenient and thus should be of significant value for the industrial fabrication of the superhydrophobic surface and should have a promising future in selective water shut-off in oilfields.

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Preparation and Characterization of Super-Hydrophobic Surfaces on Aluminum and Stainless Steel Substrates

Cited by 20 publications

References 16 publications

Orthogonal liquid-jet impingement on wettability-patterned impermeable substrates

Orthogonal liquid-jet impingement on wettability-patterned impermeable substrates

Scaling Laws in Directional Spreading of Droplets on Wettability-Confined Diverging Tracks

Superhydrophobic Surface Fabrication for Strengthened Selective Water Shut-off Technology

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