Fabrication of superoleophobic hierarchical surfaces for low-surface-tension liquids

Nakayama, Katsutoshi; Tsuji, Etsushi; Aoki, Yoshitaka; Habazaki, H.

doi:10.1039/c4ra04144e

Cited by 39 publications

(46 citation statements)

References 40 publications

(56 reference statements)

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“…The chemical etching with FHH solution led to the creation of pits that, given the crystalline structure of aluminum, are distributed hierarchically in cubic forms forming numerous micro and sub‐micrometric plateaus, interconnected and evenly distributed over the whole surface of the substrate. In agreement with previous works, this kind of microstructure is typical of aluminum surfaces obtained in processes involving etching with HCl …”

Section: Resultssupporting

confidence: 92%

Easy functionalization process applied to develop super‐hydrophobic and oleophobic properties on ASTM 1200 aluminum surface

Carneiro

Ferreira

Houmard

2018

Surface & Interface Analysis

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Funding information FAPEMIG; CNPqSuper-hydrophobic and oleophobic surfaces on ASTM 1200 H14 aluminum alloy substrates were achieved by chemical etching followed by deposition of organically modified silicate (ORMOSIL) coatings synthesized through sol-gel method. The chemical etching using FHH solutions (FeCl 3 + HCl + H 2 O 2 ) was adapted for the studied aluminum alloy by varying the concentration of iron (III) chloride and the etching time in order to increase the surface roughness of the material. This chemical etching produces rough surfaces exhibiting superficial square pores with edges about 1 to 2 μm. The chemical modifications with ORMOSIL solutions based on 1H,1H,2H,2Hperfluorooctyltriethoxysilane (PFOTES) and hexadecyltrimethoxysilane sol-gel precursors induced water contact angles about 154°and 150°, respectively, and sliding angles smaller than 5°, on the previously optimized etched surface. Moreover, the surface modification with ORMOSIL based on PFOTES reached also an oleophobic character with an oil contact angle about 136°due to air entrapment in the surface roughness at the oil-aluminum interface. Finally, ORMOSIL coatings produced with varied concentrations of PFOTES and tetraethoxyorthosilane precursors proved that the super-hydrophobic and oleophobic properties can be maintained with an important decrease of the PFOTES precursor, which should significantly decrease the cost production of such functional surfaces and could favour its mechanical durability.

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Section: Resultssupporting

confidence: 92%

Easy functionalization process applied to develop super‐hydrophobic and oleophobic properties on ASTM 1200 aluminum surface

Carneiro

Ferreira

Houmard

2018

Surface & Interface Analysis

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“…The authors recently reported that micro‐/nanodual pore aluminum surfaces produced by chemical etching and anodizing of high purity aluminum show superoleophobicity even for low‐surface‐tension liquids, such as octane, after fluoroalkylphosphonic acid coating . Figure shows scanning electron microscope (SEM) images of the surfaces in this study, where we utilized this hierarchical surface with cylindrical nanopores to add a healing agent into the surface.…”

Section: Resultsmentioning

confidence: 99%

“…Low magnification SEM images reveal microscale roughness developed by chemical etching. The chemical etching of aluminum in a mixed solution of HCl + CuCl 2 forms a number of crystallographic etch pits with a half‐cubic morphology as the basic structural unit of each pit . The dissolution of aluminum occurs preferentially in the crystallographic 〈100〉 direction, and the size of pits is controlled by the rate of saturation precipitation of AlCl 3 that induces passivation of the pits.…”

Section: Resultsmentioning

confidence: 99%

“…Durability is a crucial issue even for superoleophobic surfaces. The authors previously developed a superoleophobic aluminum surface by a combined wet process of chemical etching, anodizing, and organic monolayer coating . The obtained hierarchical micro‐/nanodual pore surface with a fluoroalkyl monolayer coating exhibited super‐repellency even for liquids with surface tensions as low as ≈20 mN m −1 .…”

Section: Introductionmentioning

confidence: 99%

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Rapid and Repeatable Self‐Healing Superoleophobic Porous Aluminum Surface Using Infiltrated Liquid Healing Agent

Nakayama

Koyama

Chen

et al. 2018

Adv Materials Inter

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This paper reports rapid self‐healing on superoleophobic hierarchically porous aluminum surfaces within 1 h even at room temperature. This self‐healing surface is prepared by infiltration of a liquid fluoroalkylsilane (FAS) coating into the substrate pores. The FAS‐infiltrated dual‐pore superoleophobic surface becomes superoleophilic after oxygen plasma treatment due to the damage done to the organic coating. However, the superoleophobicity is completely recovered by exposure to normal atmosphere at room temperature, and this rapid self‐healing is repeatable. The FAS liquid appears to coat the nanopore walls, rather than filling the nanopores. The high wettability of FAS on surfaces induces the rapid recoating of the plasma‐damaged surface, contributing to the self‐healing of the superoleophobicity.

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“…Before nanoimprinting, phosphonic acid-based SAM (TDPA) was coated on the nanostructured aluminum surface (Fig. 8a) [52][53]. In this procedure, the nanostructured aluminum specimen was immersed in a TDPA ethanol solution for 2 days.…”

Section: Polymer Nanoimprinting Using Nanostructured Aluminum Moldsmentioning

confidence: 99%

Polymer nanoimprinting using an anodized aluminum mold for structural coloration

Kikuchi

Nishinaga

Natsui

2015

Applied Surface Science

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2 HighlightsHighly ordered aluminum dimple arrays are fabricated via etidronic acid anodizing.The ordered dimple arrays display structural coloration with a rainbow distribution.Aluminum nanostructures can be transferred to polymers via nanoimprinting.The nanostructured polymer surfaces also exhibit structural coloration. 3 AbstractPolymer nanoimprinting of submicrometer-scale dimple arrays with structural coloration was demonstrated. Highly ordered aluminum dimple arrays measuring 530 to 670 nm in diameter were formed on an aluminum substrate via etidronic acid anodizing at 210 to 270 V and subsequent anodic oxide dissolution. The nanostructured aluminum surface led to bright structural coloration with a rainbow spectrum, and the reflected wavelength strongly depends on the angle of the specimen and the period of the dimple array. The reflection peak shifts gradually with the dimple diameter toward longer wavelength, reaching 800 nm in wavelength at 670 nm in diameter. The shape of the aluminum dimple arrays were successfully transferred to a mercapto-ester ultra-violet curable polymer via self-assembled monolayer coating and polymer replications using a nanoimprinting technique. The nanostructured polymer surfaces with positively and negatively shaped dimple arrays also exhibited structural coloration based on the periodic nanostructure, and reflected light mostly in the visible region, 400-800 nm. This nanostructuring with structural coloration can be easily realized by simple techniques such as anodizing, SAM coating, and nanoimprinting.Keywords: Anodizing; Anodic Porous Alumina; Etidronic Acid; Structural Coloration; Nanoimprinting 4 IntroductionAnodic porous alumina possesses characteristic nanofeatures, including highly ordered porous structures with high-aspect ratio nanopores measuring several tens or hundreds of nm in diameter, and can easily be fabricated via aluminum anodizing in several appropriate acidic electrolyte solutions [1][2][3][4]. Because it is difficult to obtain such similar high-aspect ratio porous materials by other techniques, anodic porous alumina has been widely investigated by researchers in nano-science and engineering applications, such as fundamentals [5][6][7] [41]. In particular, anodizing in sulfuric, selenic, oxalic, malonic, tartaric, and phosphoric acid solutions under the appropriate electrochemical conditions causes self-ordering growth of the porous alumina [1,2,42]. Accordingly, highly ordered anodic porous alumina with a high aspect ratio has been successfully obtained on aluminum substrates. However, the cell diameter (interpore distance) of the porous alumina formed in these electrolyte solutions is limited to up to approximately 500 nm in diameter at the corresponding anodizing voltage of 200 V [1]. Therefore, a novel high-voltage electrolyte is required for the self-ordering of porous alumina with large-scale cell diameters.Recently, we reported a new self-ordering electrolyte for anodic porous alumina fabrication, etidronic acid (1-hydroxyethane-1,1-diphosphonic ...

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Fabrication of superoleophobic hierarchical surfaces for low-surface-tension liquids

Cited by 39 publications

References 40 publications

Easy functionalization process applied to develop super‐hydrophobic and oleophobic properties on ASTM 1200 aluminum surface

Easy functionalization process applied to develop super‐hydrophobic and oleophobic properties on ASTM 1200 aluminum surface

Rapid and Repeatable Self‐Healing Superoleophobic Porous Aluminum Surface Using Infiltrated Liquid Healing Agent

Polymer nanoimprinting using an anodized aluminum mold for structural coloration

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