Femtosecond laser-induced shape memory polymer micropillar with tunable wettability and reversible adhesion for underwater oil droplet lossless transfer

Jiao, Yunlong; Li, Chuanzong; Ji, Jiawei; Wang, Zhaochang; Tao, Tongtong; Zhang, Tao; Liu, Kun

doi:10.1063/5.0040990

Cited by 21 publications

(16 citation statements)

References 34 publications

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“…Then, it can be seen that under the point contact condition, the contact load would be higher (Figure b) on the microtextured surface compared with that on the SHB coating surface because of the difference of contact area. In addition, due to the low surface energy, SHB coating the adhesion friction between the friction pair is smaller, − and the particles from the wear debris would also play a lubrication role at the interface (Figure c). Thus, the friction coefficient on the SHB coating surface is smaller than that on the microtextured surface.…”

Section: Resultsmentioning

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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Section: Resultsmentioning

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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“…In this study, a novel multibiomimetic strategy was raised in combination with a spraying-coating method to prepare a Janus membrane with wrinkled topography and magnetically responsive microcilia arrays, which exhibits an extremely high contrast of wettability on opposing sides. , As exhibited in Figure , on one hand, a wrinkled and viscoelastic topography coated on a fabric fiber is fabricated simply by Ar plasma treatment for a cross-linking gradient of PDMS, similar to the ordered wrinkled skin of the earthworm. The obtained superhydrophobic fabrics exhibit ultradurability, underoil superhydrophilicity, and self-cleaning properties, which can easily separate different water-in-oil emulsions by only gravity at a high flux.…”

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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“…The noble quality of the lotus leaf is highlighted by the phrase “keeping clean in the dirty soil”, which reflects the self-cleaning property of the lotus leaf. Inspired by this unique property, SHB functional surfaces have been intensively explored in various fields, such as self-cleaning, , oil–water separation, water droplet energy harvesting, drag reduction, , and so on. − However, the biggest drawback of SHB surfaces is its poor mechanical properties and resistance to wear . Thus, researchers have used different strategies, such as passive resistance strategies and active regeneration strategies, to construct robust SHB surfaces. , For example, Verho et al used hierarchical roughness to improve the wear resistance of the surface, where the microscale structure protected the fragile nanostructure from wear .…”

Section: Introductionmentioning

confidence: 99%

Underwater Drag Reduction and Buoyancy Enhancement on Biomimetic Antiabrasive Superhydrophobic Coatings

Wang

Liu

et al. 2021

ACS Appl. Mater. Interfaces

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A superhydrophobic (SHB) surface with an excellent self-cleaning ability is of great significance in both human survival and industrial fields. However, it is still a challenge to achieve large-area preparation of antiabrasive SHB surfaces with great mechanical robustness for broader applications. Thus, a kind of facile SHB coating with excellent liquid repellency and antiresistance is constructed by spraying a fluorine-free suspension consisting of epoxy resin, hexadecyltrimethoxysilane (HDTMS), and silica nanoparticles on a glass sheet. The SHB coating not only shows high adhesion on various materials but also has high water repellency under various test conditions, including tape peeling after blade scraping, sandpaper abrasion, and immersing in a complex environment. Additionally, the SHB spheres coated with laser-induced microstructure armor could form a continuous gas cavity during the water entry process, which is essential to prolonging the drag reduction ability of SHB coatings in liquid. Finally, the prepared robust SHB coatings have been employed in underwater buoyancy enhancement and reducing fluid resistance, which may open new avenues for underwater drag reduction in the field of marine applications.

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Femtosecond laser-induced shape memory polymer micropillar with tunable wettability and reversible adhesion for underwater oil droplet lossless transfer

Cited by 21 publications

References 34 publications

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

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

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

Underwater Drag Reduction and Buoyancy Enhancement on Biomimetic Antiabrasive Superhydrophobic Coatings

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