A novel and cost-effective method for fabrication of a durable superhydrophobic aluminum surface with self-cleaning properties

Afzali, Neda; Taghvaei, Ehsan; Moosavi, Ali

doi:10.1088/1361-6528/abad5c

Cited by 13 publications

(5 citation statements)

References 44 publications

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“…Besides, the SiO 2 /PA66/PANI membrane also showed underwater superoleophobicity with all UWOCAs of ∼150°for various oil, confirming its universal underwater superhydrophobic property (figure 3(c)). More importantly, the biomimetic SiO 2 /PA66/PANI membrane maintained outstanding superhydrophilicity and underwater superoleophobicity after 200 cycles of bending in 1 M HCl, 1 M NaOH, 10 wt% NaCl, ethanol, water, and liquid nitrogen (−196 °C), as well as 2 h of continuous stirring treatment inwater (figure 3(d)), which was critical for its application in diverse conditions [30][31][32][33]. The dynamic wetting behaviors of liquids on the SiO 2 /PA66/PANI membrane were recorded by a high-speed camera.…”

Section: Wetting Behavior Regulationmentioning

confidence: 99%

Charged membranes based on spider silk-inspired nanofibers for comprehensive and continuous purification of wastewater

Zhang

Liu

et al. 2021

Nanotechnology

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Creating a facile and efficient porous membrane for the comprehensive treatment of both insoluble and soluble pollutants from water is of great significance, yet remains challenging. Here, we present a facile strategy to prepare charged nanofibrous membranes assembled from spider silk-like humped SiO2/polyamide 66 (PA66)/polyaniline (PANI) nanofibers by combing Plateau−Rayleigh instability-induced assembly and in situ synthesis. The obtained nanofibrous membranes possess micro/nanostructured surfaces with promising superhydrophilic and underwater superoleophobic property, which are attributed to the synergy of hierarchical roughness and hydrophilic matrix. Combined with the superwettability and the integrated property of submicron pore size, high porosity, and good pore interconnectivity, the membranes can separate various oil-in-water emulsions with a remarkable permeation flux of 5403 l m−2 h−1 and a high separation efficiency (total organic carbon content <5 mg l−1). Moreover, attributed to the Laplace pressure difference and positive potential of the spindle-knotted nanofibers, the biomimetic nanofibrous membranes could remove the filter cake during separation. In addition, the membrane exhibits a remarkable adsorption-reduction capacity of hexavalent chromium. The synthesis of such attractive nanomaterials may provide new insights into the development of multifunctional separation materials for environmental applications.

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Section: Wetting Behavior Regulationmentioning

confidence: 99%

Charged membranes based on spider silk-inspired nanofibers for comprehensive and continuous purification of wastewater

Zhang

Liu

et al. 2021

Nanotechnology

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“…However, quite many metal shell materials applied in high-end electronic products show poor self-cleaning properties due to the hydrophilicity and lipophilicity of metals themselves, which limits wide application. Generally, the methods used to increase hydrophobicity on the metal surface include the preparation of hydrophobic coatings and the fabrication of hydrophobic structure, which can effectively improve the hydrophobicity by adjusting the micro-nanostructure of the metal substrate surface [11][12][13]. For obtaining a hydrophobic porous high entropy alloy, we chose AlCoCrFeNi 2.1 and AlCoCrFeNi HEAs as the substrate materials and then performed the electrochemical dealloying treatment in 5% sulfuric acid (H 2 SO 4 ) solution.…”

Section: Introductionmentioning

confidence: 99%

Investigation of micro and nanostructure on porous high-entropy alloy surface influences its hydrophobicity

Wang,

Zhang,

Zou

et al. 2024

Ninth International Conference on Energy Materials and Electrical Engineering (ICEMEE 2023)

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The micro and nanostructures of materials have an important effect on the wettability of materials' surfaces. For AlCoCrFeNi 2.1 and AlCoCrFe Ni High-entropy alloy, the special porous micro and nanostructure can be fabricated by electrochemical dealloying in 5 wt.% sulfuric acid solution aiming to improve the hydrophobicity of the material surface. The surface crystal structure of the prepared porous HEAs was characterized by X-ray diffraction, the micromorphologies were characterized by a Scanning electron microscope, and the static water contact angles were measured by a contact angle goniometer. The results showed that AlCoCrFeNi 2.1 HEA showed nanoscale pores and smooth surfaces, while AlCoCrFeNi HEA showed microscale pores but rough surfaces generated from nanoscale short rod-like particles. AlCoCrFeNi 2.1 HEA showed FCC (Fe-, Cr-and Ni-rich) and BCC (Al-and Ni-rich) dual phase structures and AlCoCrFeNi HEA showed BCC (Al-and Ni-rich) and B2 (Fe-and Cr-rich) phase structure. The prepared porous AlCoCrFeNi HEA possessed quite good hydrophobicity than that of AlCoCrFeNi 2.1 HEA, and this can be explained as the result of the "lotus effect" formed by the aggregation of nanoscale short rod-like particles.

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“…Even though aluminum is considered fairly corrosion resistant, it can still be subjected to corrosion in extreme environments. Hence, making it superhydrophobic can not only make it corrosion resistant in such extreme environments but also impart self-cleaning − and anti-icing , properties which improve the overall performance of the material. These properties also help in maintaining the aesthetics of the material (if they are used in an external structure) although most of the treatments often make a trade-off with the inherent metallic luster of aluminum.…”

Section: Introductionmentioning

confidence: 99%

“…Previously, researchers have used techniques such as dislocation selective chemical etching, anodization, , acid/base etching, ,,− boiling in water, nanoparticle coating, sandblasting, high-speed wire electric discharge, microplasma jetting and photolithography , for creating a rough metal surface. Most of these techniques either do not have a precise control on the pattern and extent of etching (acid/base etching, boiling in water), are difficult to implement (nanoparticle coating, high-speed wire electric discharge), and/or are too sophisticated to be practically employed in large scale applications (microplasma jetting, photolithography).…”

Section: Introductionmentioning

confidence: 99%

Superhydrophobic and Self-Cleaning Aluminum via a Rapid and Controlled Process

Sharma

Garg

2022

ACS Appl. Eng. Mater.

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Superhydrophobic and self-cleaning materials have been an extensive topic of research owing to their corrosion resistance, antifouling, and anti-icing properties. In the past, superhydrophobicity in aluminum has been obtained by a variety of techniques involving etching by sandblasting, chemical etching, boiling in water, etc. followed by treatment with a fluorochemical and organic solution. However, these techniques are not controlled, might not be easy to implement on a large scale, and mostly make use of fluorochemicals, which are risky for human health and the environment. Therefore, there is a need for a rapid and controlled fabrication process that can provide patterned superhydrophobicity without compromising the environment or the human health. Here, a rapid, controlled, and environmentally friendly procedure for fabricating a superhydrophobic and self-cleaning aluminum surface has been developed, achieving a contact angle of 158.06° and a sliding angle of 1.94°. In the two-step process, a rough surface was obtained using the laser etching technique in under 3 min, which resulted in a precisely controlled pattern with a dual-scale roughness on the surface (∼20–30 μm). Finally, a low surface energy was imparted to the surface by treatment with stearic acid where a low concentration of 2 × 10–4 M and no more than 10 s of exposure was found to be sufficient. Unlike various superficially coated materials, this superhydrophobic surface is durable and does not lose its properties after dipping in water for up to 4 days, encountering fine sand or mud, or at extreme surrounding temperatures of −18 to 100 °C. Thus, this rapid and controlled process for obtaining superhydrophobic aluminum potentially can be deployed for large-scale, structural applications.

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A novel and cost-effective method for fabrication of a durable superhydrophobic aluminum surface with self-cleaning properties

Cited by 13 publications

References 44 publications

Charged membranes based on spider silk-inspired nanofibers for comprehensive and continuous purification of wastewater

Charged membranes based on spider silk-inspired nanofibers for comprehensive and continuous purification of wastewater

Investigation of micro and nanostructure on porous high-entropy alloy surface influences its hydrophobicity

Superhydrophobic and Self-Cleaning Aluminum via a Rapid and Controlled Process

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