Fabrication of repairable anti-corrosive superhydrophobic surfaces with micro-nano structures by ultrasonic cavitation

Chen, Fengjun; Du, Jianhua; Huang, Shuai

doi:10.1016/j.apsusc.2020.148605

Cited by 25 publications

(7 citation statements)

References 44 publications

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“…From Figure 3b, we could conclude that the rate of CAs declining varied between rapid speed and low speed alternately in Stage I of copper microcolumn array structure covering relative dimensions of 29.8–208.6. [ 23,24 ] Meanwhile, the overall change trend of CA was from 150.8° for the relative dimension of 29.8–128.6° for the relative dimension of 178.8. Nevertheless, the CA hit the high point of 132.2° for the relative dimension of 298 after continuously increasing from 125.2° for the relative dimension of 208.6 in Stage II.…”

Section: Resultsmentioning

confidence: 99%

Section: Changes Of Cas With Droplet Sizementioning

confidence: 98%

“…As illustrated in Figure 3a, the brass microcolumn array structure showed the maximum CA of 148.5 at the relative dimensions of 29.8. [22][23][24] Specifically, the CA of the droplet gradually decreased to 131 when the droplet relative dimensions increased from 29.8 to 149. Therefore, in the area of 29.8 to 149, the exponential decaying of the CAs was determined as Stage I.…”

Section: Changes Of Cas With Droplet Sizementioning

confidence: 99%

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The Size Effect on Contact Angles and Dynamic Behaviors of Droplets on Microcolumn and Microstrip Array Surfaces

Zhao

et al. 2022

Adv Eng Mater

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The hydrophobicity of biomimetic hydrophobic surfaces exhibits a correlation with droplet relative dimension. Nevertheless, the droplet relative dimension‐dependent wettability, contact angles, dynamic droplet bouncing behaviors need to be further investigated. This article focuses on the size effect of droplet relative dimension on the contact angles and dynamic behaviors of regular microcolumn and microstrip array surfaces, which were directly machined by low‐speed wire electrical discharge machining (WEDM‐LS). Specifically, the contact angles are measured with droplet relative dimension in a range from 29.8 to 298 on various structured surfaces. The dynamic droplet bouncing tests are based on a coincident falling height of 10 mm. The period time is also gradually shortened with the decreasing of droplet relative dimension, which indicated that the droplets with relatively larger relative dimensions are more difficult to overcome the adhesion of arrayed structures. Meanwhile, when the droplet relative dimension exceeded a critical value, the droplet failed to separate from the substrate due to the interface adhesion and the period time would be also shortened which attributed to less time consumption for the insufficient capillary force compared with the gravity.

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Section: Resultsmentioning

confidence: 99%

Section: Changes Of Cas With Droplet Sizementioning

confidence: 98%

Section: Changes Of Cas With Droplet Sizementioning

confidence: 99%

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The Size Effect on Contact Angles and Dynamic Behaviors of Droplets on Microcolumn and Microstrip Array Surfaces

Zhao

et al. 2022

Adv Eng Mater

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“…It is a convenient source for producing an extreme temperature of ∼5000 °C and pressure of 1000 atm. Moreover, it can enhance the mass transport and generate surface damage at the liquid–solid interface through shock waves and microjets. , There are a few reports of ultrasound-assisted superhydrophobic surface fabrication. − For example, Wang et al developed superhydrophobic coatings on commercial sponges with an ultrasound technique by submerging them into a slightly alkaline aqueous mixture consisting of dopamine hydrochloride dodecyltrimethoxysilane . They obtained a chemically robust hierarchical surface morphology within 25 min of dipping; however, the mechanical durability was not reported.…”

Section: Introductionmentioning

confidence: 99%

Acrylonitrile Butadiene Polystyrene–SiO₂ Composite Nanostructures for Self-Regulated Superhydrophobic Liquid Dosage Systems

Arun

Kim

Sreekala

et al. 2022

ACS Appl. Nano Mater.

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Superhydrophobic coatings are widely studied for fluid regulation due to their water-repellent surface characteristics. However, there are not many reports on fluid behavior when it flows from a region of higher wettability to that of lower wettability. A fundamental understanding of such behavior would be very useful for regulating the fluid flow through a superhydrophobic channel. Therefore, this work focused on the fabrication of superhydrophobic nanostructured coatings inside fine cylindrical channels and the investigation of the fluid flow behavior through them. The superhydrophobic SiO 2 coatings were obtained through an ultrasound-assisted one-step immersion technique. A self-stratified mechanically durable conformal superhydrophobic coating was obtained inside millimeter-sized fine 3D structures. A binder-free precursor solution has low viscosity and thereby enhances the penetration of the solvent into the polymer surface through ultrasonication. The self-stratification-based surface formation mechanism was explained using scanning electron microscopy images. The fluid behavior inside the superhydrophobic channels was experimentally investigated by analyzing the flow through the hollow cylindrical superhydrophobic channels. Experiments were conducted for different channel lengths (l) and radii (r), and mathematical formulations were developed to determine the maximum pressure (P max ) that the superhydrophobic cylinders could hold when the fluid inside the channel was under static equilibrium. Finally, a self-regulated fluid delivery system was postulated based on the experimental and theoretical findings.

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“…According to classical Cassie–Baxter theory, the water contact angle (WCA) can be enhanced by improving surface roughness and reducing surface energy. − However, any damage to an engineered functional surface may greatly reduce its hydrophobicity or even make it hydrophilic, which would cause the material to lose its ability to separate oil from water. − Most aforementioned materials and structured surfaces are not able to withstand mechanical abrasion or more severe physical damages since the hierarchical micro–nanostructures could be wiped away in repetitive mechanical abrasion . To improve the robustness and durability of the porous material, researchers have found that creating second-scale nanostructures on top of the first-scale microstructures could enhance the durability of the surface since the multilayered structure could provide a complex surface which could prolong the service life of the structured surface. − Improving the adhesion strength between the structured coatings and the porous substrate is another approach to enhance mechanical durability.…”

Section: Introductionmentioning

confidence: 99%

Superhydrophobic UHMWPE Foams with High Mechanical Robustness and Durability Fabricated by Supercritical CO₂ Foaming

Sun

Guo

et al. 2021

ACS Sustainable Chem. Eng.

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The low durability and stability of superhydrophobic foams and high fabrication costs are the main reasons that limit their practical applications in water remediation and oil recycling. Herein, an extremely superhydrophobic and exceptionally robust foam was developed based on ultrahigh-molecular weight polyethylene (UHMWPE) by supercritical carbon dioxide (scCO2) foaming and subsequent surface modification. The developed foam comprises a highly porous structure decorated with hydrophobic silica nanoparticles and aligned UHMWPE crystallites, constructing a complex micro–nanosized hierarchical morphology, which contributed to an unprecedented water contact angle (WCA) of 162° and a sliding angle of 1°. When used in selective oil absorption and oil/water separation, the foam demonstrated about 100% separation efficiency in repetitive use and even under a vacuum of −70 Kpa due to its high water repellency. More importantly, the foam has outstanding tolerance against mechanical damages such as ultrasonication, bending and twisting, tape peeling, steel wool abrasion, and knife scratching. The surface could maintain the hierarchical structure and a WCA of over 156° after enduring different damages. Moreover, when the surface is clogged, the foam could restore its superhydrophobicity by arbitrary fracturing and cutting, resulting in a theoretically unlimited lifespan. This work not only proposes a UHMWPE-based superhydrophobic foam with extremely high superhydrophobicity, durability, and separation efficiency but also provides insights into the design and mass production of ultraefficient and robust superhydrophobic porous materials for practical applications.

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Fabrication of repairable anti-corrosive superhydrophobic surfaces with micro-nano structures by ultrasonic cavitation

Cited by 25 publications

References 44 publications

The Size Effect on Contact Angles and Dynamic Behaviors of Droplets on Microcolumn and Microstrip Array Surfaces

The Size Effect on Contact Angles and Dynamic Behaviors of Droplets on Microcolumn and Microstrip Array Surfaces

Acrylonitrile Butadiene Polystyrene–SiO₂ Composite Nanostructures for Self-Regulated Superhydrophobic Liquid Dosage Systems

Superhydrophobic UHMWPE Foams with High Mechanical Robustness and Durability Fabricated by Supercritical CO₂ Foaming

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Fabrication of repairable anti-corrosive superhydrophobic surfaces with micro-nano structures by ultrasonic cavitation

Cited by 25 publications

References 44 publications

The Size Effect on Contact Angles and Dynamic Behaviors of Droplets on Microcolumn and Microstrip Array Surfaces

The Size Effect on Contact Angles and Dynamic Behaviors of Droplets on Microcolumn and Microstrip Array Surfaces

Acrylonitrile Butadiene Polystyrene–SiO2 Composite Nanostructures for Self-Regulated Superhydrophobic Liquid Dosage Systems

Superhydrophobic UHMWPE Foams with High Mechanical Robustness and Durability Fabricated by Supercritical CO2 Foaming

Contact Info

Product

Resources

About

Acrylonitrile Butadiene Polystyrene–SiO₂ Composite Nanostructures for Self-Regulated Superhydrophobic Liquid Dosage Systems

Superhydrophobic UHMWPE Foams with High Mechanical Robustness and Durability Fabricated by Supercritical CO₂ Foaming