Facile fabrication of hierarchical textures for substrate-independent and durable superhydrophobic surfaces

He, Yuchun; Wang, Lingxiao; Wu, Tingni; Wu, Zhipeng; Chen, Yu; Yin, Kai

doi:10.1039/d2nr02157a

Cited by 129 publications

(59 citation statements)

References 63 publications

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“…Recently, this technology has been widely used in the field of regulating surface wettability on account of its exceptional advantages such as high precision, no‐contact processing, and high efficiency. [ 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 ] Figure 1d demonstrates a schematic process for preparing a heterogeneous superwettability surface on the PI film. First, to guarantee uniformity and symmetry in every direction, a high repetition rate (200 kHz) and high power (700 mW) femtosecond laser was employed to scribe an annular superhydrophobic pattern through line‐by‐line scanning on the PI film.…”

Section: Resultsmentioning

confidence: 99%

Wetting Ridge‐Guided Directional Water Self‐Transport

et al. 2022

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Directional water self‐transport plays a crucial role in diverse applications such as biosensing and water harvesting. Despite extensive progress, current strategies for directional water self‐transport are restricted to a short self‐driving distance, single function, and complicated fabrication methods. Here, a lubricant‐infused heterogeneous superwettability surface (LIHSS) for directional water self‐transport is proposed on polyimide (PI) film through femtosecond laser direct writing and lubricant infusion. By tuning the parameters of the femtosecond laser, the wettability of PI film can be transformed into superhydrophobic or superhydrophilic. After trapping water droplets on the superhydrophilic surface and depositing excess lubricant, the asymmetrical wetting ridge drives water droplets by an attractive capillary force on the LIHSS. Notably, the maximum droplet self‐driving distance can approach ≈3 mm, which is nearly twice as long as the previously reported strategies for direction water self‐transport. Significantly, it is demonstrated that this strategy makes it possible to achieve water self‐transport, anti‐gravity pumping, and chemical microreaction on a tilted LIHSS. This work provides an efficient method to fabricate a promising platform for realizing directional water self‐transport.

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Section: Resultsmentioning

confidence: 99%

Wetting Ridge‐Guided Directional Water Self‐Transport

et al. 2022

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“…Compared with monofunctional membranes, Janus smart membranes can simply realize the opposite separation synergistically by simple operation, resulting from an intrinsic inner driving force of Janus membranes. At present, many strategies have been applied to fabricate Janus membranes, such as floated coating and deposition, unidirectional segregation, sequential electrospinning, thiol–ene click chemistry, vapor treatment, photopolymerization, photografting, laser structuring, and so on. − However, this has to be settled urgently for preparation of a membrane by a facile approach on various alternative substrates, and a Janus membrane is deficient for separating various emulsions due to inconspicuous wetting asymmetry. As for separating a water-in-oil emulsion, Janus membrane surfaces lack instantaneous wettability, which increases the transmembrane resistance during slow penetration, resulting in a lower flux for a large-scale application.…”

Section: Introductionmentioning

confidence: 99%

Janus Fabric with Asymmetric Wettability for Switchable Emulsion Separation and Controllable Droplets with Low Friction

Huang

et al. 2023

Langmuir

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Superwetting surfaces have recently attracted extensive attention in oil−water emulsion separation and droplet manipulations, which are widely used in various situations ranging from wastewater treatment, to flexible electronics, to biochemical diagnosis. However, it still remains challenging to obtain asymmetric materials with high efficiency during oil−water separation. Meanwhile, excellent robustness of the superhydrophobic surface is of significance but retards the mobility of droplets due to increased lateral adhesion of small spacing between solid protrusions. Herein, a facile approach is demonstrated to obtain the excellent robustness of Janus fabrics with asymmetric wettability. As for one side of water-inoil emulsion separation, mimicking the soft earthworm with periodically wrinkled skin, an adaptive superhydrophobic fabric was fabricated by wrapping soft wrinkled poly(dimethylsiloxane) (PDMS) polymer with a cross-linking structure on woven fabric fibers induced by Ar plasma treatment. In addition, inspired by the desert beetle's structure but with reversed wettability, the other side of the Janus fabric was constructed for treating emulsion of oil-in-water. In addition, the underwater superoleophobic surface consisting of magnetically responsive PDMS microcilia with slippery heads, which shows robustness against pH, improved water drop mobility and lowered the resistance of fluid friction similar to the intrinsic hydrophobic Salvinia molesta with additional slippery performance. Hence, we propose a novel and easy approach that optimizes enhanced emulsion separation and reduced fluid drag properties simultaneously, which actively broadens their widespread applications.

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“…More recently, Yin et al proposed a facile fabrication of hierarchical textures based on laser direct processing for durable SHB surfaces, which is independent of substrate properties and has excellent anti-wear performance. 44 It should be noted that although some great studies have been conducted on the microtexture-protecting SHB coating, several research directions are worth exploring. (1) The existing studies are mainly concentrated on the fabrication and property characterization of microtextured SHB surfaces, and the effect of surface topography on the abrasion resistance of the SHB surface is less studied.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Even in the harsh operating environments, such as reciprocating sliding friction under high pressure, the prepared surfaces could keep a high water repellency without any performance degradation. More recently, Yin et al proposed a facile fabrication of hierarchical textures based on laser direct processing for durable SHB surfaces, which is independent of substrate properties and has excellent anti-wear performance . It should be noted that although some great studies have been conducted on the microtexture-protecting SHB coating, several research directions are worth exploring.…”

Section: Introductionmentioning

confidence: 99%

Functional Microtextured Superhydrophobic Surface with Excellent Anti-Wear Resistance and Friction Reduction Properties

Jiao

Zhang

et al. 2022

Langmuir

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The wear-resistant superhydrophobic (SHB) surfaces with excellent water-repellency ability were prepared by constructing a microtextured armor on an aluminum surface. With the assistance of laser-induced microtextures, the SHB surface could keep a longer water-repellency ability and a lower friction coefficient even after repeated friction tests under different loads and at different speeds. The mechanism of microtexture-protecting SHB coating is revealed based on both theoretical and elemental analysis. Additionally, we explore the relationship between the three-dimensional topography parameters (ISO 25178) and variation of water contact angles under different test recycles. The results show that the rough surface with appropriate S a and higher S ku exhibits a better wear resistance, which is mainly related to the storing ability of SHB coating inside the microtextures. Moreover, the surface with appropriate S tr exhibits excellent wear resistance, which is mainly associated with better chip-removal ability. Finally, the tribological properties of the microtextured SHB surface are researched. It is worth noting that compared with the microtextured surface without SHB coating and the SHB-coated surface without microtextures, the microtextured SHB surface has the lowest friction coefficient under dry friction because the SHB coating would largely decrease the surface energy of the interface, so the adhesion friction decreases. The microtexture armor on the surfaces would protect the wear of SHB coating, so the SHB coating inside the microtexture could continuously play the role of a particle lubricant at the sliding interface and decrease the friction force of the sliding interface. We believe that the present study would contribute to the further understanding of the constructing mechanism of anti-wear SHB surfaces and provide a new strategy for topography design of engineering surfaces with friction reduction properties.

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Facile fabrication of hierarchical textures for substrate-independent and durable superhydrophobic surfaces

Abstract: We propose a facile femtosecond laser technology to achieve superhydrophobicity on various substrate surfaces with anti-friction ability.

Cited by 129 publications

References 63 publications

Wetting Ridge‐Guided Directional Water Self‐Transport

Wetting Ridge‐Guided Directional Water Self‐Transport

Janus Fabric with Asymmetric Wettability for Switchable Emulsion Separation and Controllable Droplets with Low Friction

Functional Microtextured Superhydrophobic Surface with Excellent Anti-Wear Resistance and Friction Reduction Properties

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