Novel Three‐Dimensional Nanoporous Alumina as a Template for Hierarchical TiO<sub>2</sub> Nanotube Arrays

Wang, Daoai; Zhang, Lianbing; Lee, Woo; Knez, Mato; Liu, Lifeng

doi:10.1002/smll.201201784

Cited by 43 publications

(31 citation statements)

References 37 publications

(42 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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“…In this study, more simple chemical etching has been used. 30 Fig . 1 shows scanning electron micrographs of the aluminium surfaces after chemical etching in the solutions containing 0.2 mol dm −3 CuCl 2 and several concentrations of HCl.…”

Section: Surface Geometrymentioning

confidence: 99%

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

et al. 2014

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This study demonstrates the fabrication of hierarchical surfaces with super -repellency even for low-surface-tension liquids, including octane (surface tension of 21.7 mN m −1 ). Dual-pore surfaces were prepared by a combination of practical wet processes on an alumin ium substrate: chemical etching, anodizing, and organic monolayer coating. Th e size of the larger pores formed by the chemical etching of aluminium is controlled by the concentration of HCl in the CuCl 2 /HCl etching solution. The etched aluminium is then anodized to introduce nanopores, followed by a pore-widening treatment that controls the nanopore size and porosity. The repellency for low-surface-tension liquids is enhanced by increasing the size of the larger pores as well as the porosity of the walls of the larger pores in this dual-pore morphology. Under optimized morphology with a fluoroalkyl-phosphate monolayer coating, an advancing contact angle close to 160º, a contact angle hysteresis of less than 5º and a sliding angle of 10º is achieved even for octane.

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“…Finally, Li and coworkers [54,55] report a very accurate control of the tapered pore profile to establish the necessary conditions of voltage variations, acid mixtures in the electrolyte and intermediate pore widening steps. More recently, ex situ pore 3D nanoengineering was obtained by microstructuring the aluminum previous to anodization, both by chemical etching in CuCl 2 /HCl [56,57] or by a previous lithographic step [46]. In our group, we studied how the change in a given parameter (anodization voltage, electrolyte composition or concentration) influences the pore architecture in depth, and we established rules for the realization of the desired nanostructure.…”

Section: Nanoporous Anodic Alumina Pore Engineeringmentioning

confidence: 99%

Nanostructural Engineering of Nanoporous Anodic Alumina for Biosensing Applications

et al. 2014

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Modifying the diameter of the pores in nanoporous anodic alumina opens new possibilities in the application of this material. In this work, we review the different nanoengineering methods by classifying them into two kinds: in situ and ex situ. Ex situ methods imply the interruption of the anodization process and the addition of intermediate steps, while in situ methods aim at realizing the in-depth pore modulation by continuous changes in the anodization conditions. Ex situ methods permit a greater versatility in the pore geometry, while in situ methods are simpler and adequate for repeated cycles. As an example of ex situ methods, we analyze the effect of changing drastically one of the anodization parameters (anodization voltage, electrolyte composition or concentration). We also introduce in situ methods to obtain distributed Bragg reflectors or rugate filters in nanoporous anodic alumina with cyclic anodization voltage or current. This nanopore engineering permits us to propose new applications in the field of biosensing: using the unique reflectance or photoluminescence properties of the material to obtain photonic barcodes, applying a gold-coated double-layer nanoporous alumina to design a self-referencing protein sensor or giving a proof-of-concept of the refractive index sensing capabilities of nanoporous rugate filters.

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Novel Three‐Dimensional Nanoporous Alumina as a Template for Hierarchical TiO₂ Nanotube Arrays

Cited by 43 publications

References 37 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

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

Nanostructural Engineering of Nanoporous Anodic Alumina for Biosensing Applications

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Novel Three‐Dimensional Nanoporous Alumina as a Template for Hierarchical TiO2 Nanotube Arrays

Cited by 43 publications

References 37 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

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

Nanostructural Engineering of Nanoporous Anodic Alumina for Biosensing Applications

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Product

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Novel Three‐Dimensional Nanoporous Alumina as a Template for Hierarchical TiO₂ Nanotube Arrays