Superhydrophobic Alumina Surfaces Based on Polymer‐Stabilized Oxide Layers

Höhne, Susanne; Blank, Christa; Mensch, A.; Thieme, Michael; Frenzel, Ralf; Worch, H.; Müller, Martin; Simon, Frank

doi:10.1002/macp.200900096

Cited by 38 publications

(28 citation statements)

References 17 publications

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“…Many methods have been developed so far to promote surface roughness, including sol-gel, plasma treatment, electrodeposition, anodisation, hot-water immersion, template method, chemical treatment and lithography [13][14][15][16][17][18][19][20]. Anodic aluminum oxide has been proposed as a suitable industrial process for use in the burgeoning field of nanotechnology [21] for developing nano-pore structure films with advantage of improvement of corrosion and wear resistance [22][23][24]. Low surface energy coatings can be produced by deposition of low surfaceenergy materials such as fluorocarbons and silicones precursors [8,10,25].…”

Section: Introductionmentioning

confidence: 99%

Superhydrophobic and icephobic surfaces prepared by RF-sputtered polytetrafluoroethylene coatings

Jafari

Menini

Farzaneh

2010

Applied Surface Science

194

102

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A superhydrophobic and icephobic surface were investigated on aluminum alloy substrate.Anodizing was used first to create a micro-nano structured aluminum oxide underlayer on the alloy substrate. In a second step, the rough surface was coated with RF-sputtered polytetrafluoroethylene (PTFE or Teflon®). Scanning electron microscopy images showed a "bird's nest"-like structure on the anodized surface. The RF-sputtered PTFE coating exhibited a high static contact angle of ~ 165º with a very low contact angle hysteresis of ~ 3º. X-ray photoelectron spectroscopy (XPS) results showed high quantities of CF 3 and CF 2 groups, which are responsible for the hydrophobic behavior of the coatings. The performance of this superhydrophobic film was studied under atmospheric icing conditions. These results showed that on superhydrophobic surfaces ice adhesion strength was 3.5 times lower than on the polished aluminum substrate.

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Section: Introductionmentioning

confidence: 99%

Superhydrophobic and icephobic surfaces prepared by RF-sputtered polytetrafluoroethylene coatings

Jafari

Menini

Farzaneh

2010

Applied Surface Science

194

102

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“…Anodic aluminum oxide has been proposed as a suitable industrial process for use in the burgeoning field of nanotechnology [67] for developing nano-pore structure films with advantage of improvement of corrosion and wear resistance [68,69].…”

Section: Anodizing and Some Other Techniquesmentioning

confidence: 99%

Protection of metal and alloy surfaces using corrosion resistance nanostructured superhydrophobic coatings /

Huang¹

2012

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Dans notre travail actuel, le processus de fabrication de surfaces de cuivre superhydrophobe est simplifié en une simple étape. L'application d'une tension continue entre deux plaques de cuivre immergé dans une solution diluée d'acide stéarique éthanolique transforme la surface de l'électrode de cuivre anodique en superhydrophobe due à la formation de micronano fibres de stéarate de cuivre à faible énergie de surface, tel que confirmé par rayons X diffraction (XRD) et microscopie électronique à balayage (MEB). L'augmentation du potentiel de modification, ainsi que la temps de modification conduit à l'augmentation de la valeur de la faible énergie de surface des micronanostructures ainsi que l'augmentation de la superhydrophobicité des surfaces telle que mesurée par l'angle de contact de l'eau. ABSTRACTSuperhydrophobic surfaces, which demonstrate high water-repellency, have recently become a very popular field because of its scientific and technological importance and wide range of applications in diverse areas. Preparation of nanostructured superhydrophobic surfaces requires both an optimum roughness and low surface energy; therefore, superhydrophobic surfaces are conventionally prepared employing two steps: roughening a surface and lowering its surface energy.In our present work, the fabrication process of superhydrophobic copper surfaces is simplified as just one-step. The application of a direct voltage between two copper plates immersed in a dilute ethanolic stearic acid solution transforms the surface of the anodic copper electrode to superhydrophobic due to the formation of micro-nanofibors low surface energy follower-like copper stéarate as confirmed by X-ray diffraction (XRD) and scanning electron microscope (SEM), respectively. The increase of the modification potential as well as the modification time leads to the increase of the amount of the low surface energy micro-nanostructures as well as the increase of the superhydrophobicity of the surfaces as measured by water contact angle.The nanostructured superhydrophobic aluminum alloy surfaces have also been prepared by the similar procedure as it was performed on copper surfaces. However, stearic acid modified aluminum alloy surfaces didn't show the superhydrophobic properties. Therefore, the aluminum surfaces were firstly coated with copper films followed by electrochemical modification with stearic acid solution. The copper grows as microdots on AA6061 Al alloy surfaces. The surface densities of the microdots increase with the increase of the negative deposition potentials. On the other hand their sizes as well as the distances between the microdots reduce with the increase of the negative deposition potentials. The surface roughness and water contact angle of electrodeposited copper film followed by electrochemical modification in ethanolic stearic acid solution increase with the increase in negative copper deposition potentials. The stearic acid modified copper films deposited at -0.6 V provides a surface roughness of 6.2 /un with a water contact a...

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“…Various composite structures have been made that exhibit durable superhydrophobicity, for example polymercoated roughened alumina where the extra volume created by the roughening process acts as a reservoir for polymer which can recover after damaging [18] or fluoroalkyl-coated silica nanoparticles in PDMS [19]. In [20], clay and polymer are combined to create easily applicable superhydrophobic coating while Zhu et al [21] present a composite metal fluoropolymer surface.…”

Section: Introductionmentioning

confidence: 99%

Durable superhydrophobicity in embossed CYTOP fluoropolymer micro and nanostructures

Jokinen

Suvanto

Garapaty

et al. 2013

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Abstract:Micropillars, nanopillars and dual scale micro-nanopillars were fabricated out of an inherently hydrophobic amorphous CYTOP fluoropolymer by hot embossing. The resulting pillars were superhydrophobic with high apparent contact angles (θ > 160°) and low rolling angles. Abrasion experiments were performed using a novel rotary abrasive slurry setup. Due to their inherent hydrophobicity, CYTOP micro and nanopillars retained their superhydrophobic properties even after 4 hours of abrasion (900 rpm in 10 % slurry of 30 μm alumina particles), unlike control samples prepared out of fluoropolymer coated silicon.

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Superhydrophobic Alumina Surfaces Based on Polymer‐Stabilized Oxide Layers

Cited by 38 publications

References 17 publications

Superhydrophobic and icephobic surfaces prepared by RF-sputtered polytetrafluoroethylene coatings

Superhydrophobic and icephobic surfaces prepared by RF-sputtered polytetrafluoroethylene coatings

Protection of metal and alloy surfaces using corrosion resistance nanostructured superhydrophobic coatings /

Durable superhydrophobicity in embossed CYTOP fluoropolymer micro and nanostructures

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