Generation of Ultrahydrophobic Properties of Aluminium – A first Step to Self-cleaning Transparently Coated Metal Surfaces

Thieme, Michael; Frenzel, Ralf; Schmidt, S.; Simon, Frank; Hennig, A.; Worch, H.; Lunkwitz, K.; Scharnweber, Dieter

doi:10.1002/1527-2648(200109)3:9<691::aid-adem691>3.0.co;2-8

Cited by 132 publications

(76 citation statements)

References 6 publications

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“…Others have focused on a toolbox of methods for creating these materials. A variety of superhydrophobic surfaces obtained using dry methods such as plasma modification, 26,40 laser etching, 41 and templating 42 and wet methods such as layer-by-layer deposition, 43 colloidal assembly, 44 electrospinning, [45][46][47] and solvent evaporation 48 have been reported.…”

Section: Discussionmentioning

confidence: 99%

Bioinspired Materials for Self-Cleaning and Self-Healing

Youngblood¹,

Sottos²

2008

MRS Bull.

109

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Biological systems have the ability to sense, react, regulate, grow, regenerate, and heal. Recent advances in materials chemistry and micro-and nanoscale fabrication techniques have enabled biologically inspired materials systems that mimic many of these remarkable functions. This issue of MRS Bulletin highlights two promising classes of bioinspired materials systems: surfaces that can self-clean and polymers that can self-heal. Self-cleaning surfaces are based on the superhydrophobic effect, which causes water droplets to roll off with ease, carrying away dirt and debris. Design of these surfaces is inspired by the hydrophobic micro-and nanostructures of a lotus leaf. Self-healing materials are motivated by biological systems in which damage triggers a site-specific, autonomic healing response. Self-healing has been achieved using several different approaches for storing and triggering healing functionality in the polymer. In this issue, we examine the most successful strategies for self-cleaning and self-healing materials and discuss future research directions and opportunities for commercial applications. Bioinspired Materialsfor Self-Cleaning and Self-Healing Jeffrey P. Youngblood and Nancy R. Sottos, Guest Editors water droplets. 11-13 Self-healing materials are inspired by living systems in which minor damage (e.g., a contusion or bruise) triggers an autonomic healing response. Successful healing relies on seamless integration of reactive chemical functionality into a polymer or polymer composite at the microscale, nanoscale, or molecular level. Although these two functions are quite different, together they represent the wide range of autonomic responses achievable through bioinspired design. In this article, we separately introduce the key elements of self-cleaning and self-healing materials systems and identify the scientific challenges and successful strategies for continued advancement of these nascent fields. Self-Cleaning SurfacesInterest in self-cleaning surfaces has been rekindled because of the newfound ability to structure surfaces on the submicron scale over large planar areas relevant to macroscale wetting. These structured surfaces allow the so-called "lotus-leaf effect," whereby water droplets are shed easily from certain structures, carrying away dirt and other debris. 11-13 Such bioinspired topographical methods toward self-cleaning are the focus of this review.

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Section: Discussionmentioning

confidence: 99%

Bioinspired Materials for Self-Cleaning and Self-Healing

Youngblood¹,

Sottos²

2008

MRS Bull.

109

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“…Inspired by surface engineering found in nature, and using the concepts provided by the Wenzel and Cassie-Baxter models of wetting [8,9], the methodologies for preparing superhydrophobic surfaces can be generally categorized into the 'top-down' and 'bottom-up' approaches as a first step to create a specific surface roughness. Top-down approaches encompass lithographic and template-based techniques [10], laser ablation technique [11] and plasma treatment of the surfaces [12,13]. Bottom-up approaches mostly involve self-assembly and self-organization [14], such as chemical bath deposition (CBD) [15,16], chemical vapor deposition (CVD) [17] and electrochemical deposition [18].…”

Section: Introductionmentioning

confidence: 99%

One-Step Deposition Process to Obtain Nanostructured Superhydrophobic Thin Films by Galvanic Exchange Reactions

Sarkar

Paynter

2010

Journal of Adhesion Science and Technology

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Superhydrophobic thin films of silver were fabricated on copper substrates by galvanic ion exchange reactions in a one-step process by immersing copper substrates in silver nitrate solution containing fluoroalkylsilane in different quantities. The X-ray diffraction (XRD) analyses confirmed the formation of silver films on copper substrates and the fractal-like morphological features of the silver films were confirmed using scanning electron microscopy (SEM). The contact angle of water on these surfaces is found to be greater than 165•, demonstrating water repellency with water drops rolling off the surfaces. The X-ray photoelectron spectroscopy (XPS) depth profile confirms the presence of fluorine in the silver films.

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“…Therefore, superhydrophobic surfaces are traditionally prepared using a common two-step procedure where a micro-nanorough pattern is first created using various procedures such as lithographic and template-based techniques [36], laser ablation technique [37] and plasma treatment of the surfaces [38,39], self-assembly and self-organization [40], chemical bath deposition (CBD) [41,42], chemical vapor deposition (CVD) [43], and electrochemical deposition [44], etc. These surfaces are then passivated using low surface energy coatings such as use of stearic acid or fluoroalkyl-silane molecules or by use of Teflon coating by plasma techniques [45].…”

Section: Preparation Techniques Of Superhydrophobic Surfacesmentioning

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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Generation of Ultrahydrophobic Properties of Aluminium – A first Step to Self-cleaning Transparently Coated Metal Surfaces

Abstract: No abstracts.

Cited by 132 publications

References 6 publications

Bioinspired Materials for Self-Cleaning and Self-Healing

Bioinspired Materials for Self-Cleaning and Self-Healing

One-Step Deposition Process to Obtain Nanostructured Superhydrophobic Thin Films by Galvanic Exchange Reactions

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

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