Underwater Drag Reduction and Buoyancy Enhancement on Biomimetic Antiabrasive Superhydrophobic Coatings

Wang, Zhaochang; Liu, Xiaojun; Ji, Jiawei; Tao, Tongtong; Zhang, Tao; Xu, Jimin; Jiao, Yunlong; Liu, Kun

doi:10.1021/acsami.1c14342

Cited by 56 publications

(31 citation statements)

References 52 publications

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“…We obtained a very thin (∼56 μm) PDOF with re-entrant micro-stripe structures on the surface using a well-designed novel soft-molding method (Figure e–g). In terms of the fabrication process, various multiscale fabrication methods including femtosecond laser ablation, 3D printing, and chemical etching process have recently been reported. However, these methods are difficult to directly fabricate the re-entrant structures on a transparent sticker-type polymer surface such as PFPE due to technical limitations and compatibility.…”

Section: Introductionmentioning

confidence: 99%

Robust and Transparent Lossless Directional Omniphobic Ultra-Thin Sticker-Type Film with Re-entrant Micro-Stripe Arrays

Kang

2022

ACS Appl. Mater. Interfaces

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Directional droplet-sliding control without wetting the surface is immensely required in advanced surface engineering, including biological and chemical analyses or green technology. However, the development of robust and transparent thin sticker-type directional omniphobic films for portable usage in smart microfluidic platforms is rare. In this study, we report a novel perfluoropolyether (PFPE) directional omniphobic film (PDOF). The PDOF is a robust and transparent ultra-thin sticker-type film that can control the anisotropic sliding of various liquid droplets on the surface. The PFPE is a chemically stable and turgid material compared to polydimethylsiloxane (PDMS), which is often used to fabricate liquid-repellent thin films. A well-designed fabrication criterion through adhesion engineering in the soft-molding process was developed using the PFPE to obtain a PDOF with a thickness of 56 μm, with re-entrant micro-stripe structures on the surface. The fabricated PDOF showed intriguing liquid sliding properties based on the direction and spacing of the microstructures. This aspect is defined as an anisotropic factor.

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Section: Introductionmentioning

confidence: 99%

Robust and Transparent Lossless Directional Omniphobic Ultra-Thin Sticker-Type Film with Re-entrant Micro-Stripe Arrays

Kang

2022

ACS Appl. Mater. Interfaces

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“…The bionic superhydrophobic coating opens up the way for the drag reduction of ships. The drag-reducing mechanism of the SHS is the air layer existing on the surface, which can increase the slip length to reduce frictional resistance. , When water flows over a hydrophilic solid surface, the velocity of the solid–liquid interface is zero. Therefore, the surface cannot generate slip length.…”

Section: Introductionmentioning

confidence: 99%

Ultrafast Self-Healing Superhydrophobic Surface for Underwater Drag Reduction

et al. 2022

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The self-healing superhydrophobic surfaces have attracted great interest owing to restoring superhydrophobicity without preparation crafts. However, the self-healing superhydrophobic surface still faces the dilemma of long repairing time. Especially in aqueous environments, superhydrophobic surfaces are highly susceptible to contamination and damage. In the current study, a superhydrophobic surface with ultrafast repairability was developed, which apply for drag reduction in aqueous medium. The prepared superhydrophobic surface can recover superhydrophobicity in only 30 s after severe physical and chemical damage. In addition, this research pioneered the combination of superhydrophobicity and porous structures for underwater drag reduction. The study of drag reduction confirms that the superhydrophobic surface can reduce the frictional drag by about 43% in the water. However, the drag reduction rate of the superhydrophobic surface with the porous structure can be improved to 76% due to increased stability of the air layer. More importantly, the porous structure with the average pore size of 50 μm has the most excellent stability through further experiments on the underwater air layer. This is attributed to the proper size of the pore to effectively balance the capillary force and resist wetting in the marginal region. This study will bring inspiration for the large-scale application of superhydrophobic surfaces and long-term drag reduction.

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“…The superhydrophobic coatings have attracted an increasing attention due to their promising applications in various fields, such as self-cleaning [1][2][3], anti-icing [4][5][6], corrosion resistance [7,8], and drag reduction [9,10]. The cooperation of appropriate micro/nano scale composite structure and the low-surface-energy modifier is the basic strategy for fabricating superhydrophobic coatings [11].…”

Section: Introductionmentioning

confidence: 99%

Preparation of Iron Ore Tailings-Based Superhydrophobic Coatings

Tang

Zhao

et al. 2022

Materials

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In this study, ball mill pretreated iron ore tailings were modified with tetraethoxysilane (TEOS) and hexadecyltrimethoxysilane (HDTMS) to obtain iron ore tailings/polysiloxane (IOT/POS) superhydrophobic powders, which were subsequently mixed with chloroprene rubber solution (CRS) to prepare durable superhydrophobic composite coatings. The effect of HDTMS amount and reaction time on the wettability of the superhydrophobic powder was investigated. The influence of the superhydrophobic powders concentration on the wettability of the composite coatings as well as the degree of damage of the superhydrophobicity of the composite coating was analyzed by using the sandpaper abrasion and tape peeling tests. Further, SEM and FTIR were used to analyze the formation mechanism of the IOT/POS superhydrophobic powders and coatings. The results showed for an HDTMS amount of 2.5 mmol and reaction time of 4 h, the contact angle of the IOT/POS powder was 157.3 ± 0.6°, whereas the slide angle was determined to be 5.9 ± 0.8°. For an IOT/POS powder content of 0.06 g/mL in CRS, the contact angle value of the superhydrophobic composite coating was 159.2 ± 0.5°, whereas the slide angle value was 5.5 ± 0.8°. The superhydrophobic composite coating still maintained the superhydrophobicity after the sandpaper abrasion and tape peeling tests, which indicated the iron ore tailings solid waste has the potential to prepare superhydrophobic coatings.

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Underwater Drag Reduction and Buoyancy Enhancement on Biomimetic Antiabrasive Superhydrophobic Coatings

Cited by 56 publications

References 52 publications

Robust and Transparent Lossless Directional Omniphobic Ultra-Thin Sticker-Type Film with Re-entrant Micro-Stripe Arrays

Robust and Transparent Lossless Directional Omniphobic Ultra-Thin Sticker-Type Film with Re-entrant Micro-Stripe Arrays

Ultrafast Self-Healing Superhydrophobic Surface for Underwater Drag Reduction

Preparation of Iron Ore Tailings-Based Superhydrophobic Coatings

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