Superhydrophobicity and Rapid Rebounding Induced via a Unique Nonfluorinated Aluminum-Based Multiscale Multilayer Nickel “Trampoline” Structure

Abstract

The development of a unique multilayer detached superhydrophobic structure inspired by biology with excellent superhydrophobic properties, extremely short rebound time, and low surface free energy has become a challenging issue. In this work, a superhydrophobic coating is prepared on the surface of Al 1060 via a fluorine-free, efficient, economical, and environmentfriendly approach. First, a Ni nanocone layer is obtained from a recyclable electrodeposition solution. Then, stearic acid is prepared on the Ni nanocone layer by dip-coating technology, resulting in a special superhydrophobic surface called the "trampoline" structure, which is quite different from the Ni nanocone structure, as the substrate. The contact angle of water is 161.3°, and the sliding angle is 7°. In addition, the superhydrophobic coating with this special structure has had great achievement in adhesion work, resilience performance, porosity, corrosion resistance, and self-cleaning and antifouling performance. So far, very few reports have analyzed the performance of this special structure. To explain the bounce performance induced by this special trampoline structure, a multidimensional superhydrophobic bouncing mechanism was proposed. Furthermore, this work is expected to provide inspiration for future applications of the unique nonfluorinated trampoline structure in superhydrophobic materials.

Design and Fabrication of a Sandwichlike Zn/Cu/Al–Zr Coating for Superior Anticorrosive Protection Performance of ZM5 Mg Alloy

“…The bare Mg alloy showed two semiarcs in the augmented Nyquist plot, which contained a capacitive arc at high frequency and an inductive arc at low frequency. The high-frequency loop in the Nyquist plot was ascribed to the charge-transfer resistance of the solid–liquid interface, and the diameter of the capacitive loop indicated the polarization resistance . However, increasing the number of layers led to better anticorrosion performance of the coating.…”

“…The highfrequency loop in the Nyquist plot was ascribed to the chargetransfer resistance of the solid−liquid interface, and the diameter of the capacitive loop indicated the polarization resistance. 51 However, increasing the number of layers led to better anticorrosion performance of the coating.…”

Combination of Universal Chemical Deposition and Unique Liquid Etching for the Design of Superhydrophobic Aramid Paper with Bioinspired Multiscale Hierarchical Dendritic Structure

“…27,28,35,36 In recent years, thanks to the low surface energy and hydrophobic groups of coating materials, dip coating has become one of the most popular and studied methods for constructing superhydrophobic coatings on ideal substrates, which not only effectively protect the surface microstructure but also further improve the superhydrophobic performance. 37 In particular, long-chain fluorocarbon materials with extremely low surface energy have excellent superhydrophobic properties and can effectively protect the substrate microstructure, which are widely used to manufacture superhydrophobic coatings. 38 However, because the fluorine element and its compounds are toxic to the environment and can cause harm to human health by interfering with enzyme activity and are classified as pollutants, it is necessary to avoid the use of fluorinated materials on superhydrophobic surfaces.…”

“…In recent years, thanks to the low surface energy and hydrophobic groups of coating materials, dip coating has become one of the most popular and studied methods for constructing superhydrophobic coatings on ideal substrates, which not only effectively protect the surface microstructure but also further improve the superhydrophobic performance . In particular, long-chain fluorocarbon materials with extremely low surface energy have excellent superhydrophobic properties and can effectively protect the substrate microstructure, which are widely used to manufacture superhydrophobic coatings .…”

Rationally Regulating the Mechanical Performance of Porous PDMS Coatings for the Enhanced Icephobicity toward Large-Scale Ice

“…Icing is a common natural phenomenon, and ice accumulation will have an important impact on all aspects of our lives, especially in aviation, infrastructures, and other large service devices. , For this reason, a variety of technologies have been developed, including thermal, mechanical, and chemical approaches. , However, unfriendly environments and energy waste have become the main problems to restrain the continuous development of the existing technologies. − To address these challenges, a lot of studies have been done by many researchers and scientists from aerospace and material fields. − Inspired by nature and based on the intrinsic properties of materials, the design and construction of icephobic coatings are one of the current frontier topics. − Studies show that the micro/nanostructures of superhydrophobic surface can capture a certain amount of air pockets, resulting in significant nonwetting characteristics and an icing delay ability. , However, due to the low mechanical stability of the surface micro/nanostructures, it is easy to lose the superhydrophobic properties. − More than this, the mechanical interlocking phenomenon induced by the micro/nanostructure can also increase the adhesion strength of the ice layer, which makes it difficult to achieve the purpose of real icephobicity. , In addition, slippery liquid-infused porous surfaces (SLIPSs) show an excellent anti-icing ability, especially in the aspect of reducing the adhesion strength of the ice layer. − Herein, a high-quality lubricative fluid is injected into the nanostructure to form a liquid layer on the surface, to achieve the purpose of superlubrication. Therefore, there is no direct contact between the ice layer and the micro/nanostructure, which effectively avoids the mechanical interlocking effect. , Furthermore, the low shear modulus of the superlubricative coatings can reduce the ice adhesion in a large degree.…”